@article {1136, title = {Comprehensive Evaluation for Protective Coatings: Optical, Electrical, Photoelectrochemical, and Spectroscopic Characterizations}, journal = {Frontiers in Energy Research}, volume = {9}, year = {2022}, month = {2022}, abstract = {Numerous efficient semiconductors suffer from instability in aqueous electrolytes. Strategies utilizing protective coatings have thus been developed to protect these photoabsorbers against corrosion while synergistically improving charge separation and reaction kinetics. Recently, various photoelectrochemical (PEC) protective coatings have been reported with suitable electronic properties to ensure low charge transport loss and reveal the fundamental photoabsorber efficiency. However, protocols for studying the critical figures of merit for protective coatings have yet to be established. For this reason, we propose four criteria for evaluating the performance of a protective coating for PEC water-splitting: stability, conductivity, optical transparency, and energetic matching. We then propose a flow chart that summarizes the recommended testing protocols for quantifying these four performance metrics. In particular, we lay out the stepwise testing protocols to evaluate the energetics matching at a semiconductor/coating/(catalyst)/liquid interface. Finally, we provide an outlook for the future benchmarking needs for coatings.}, keywords = {coating, energetics, performance evaluation, performance metrics, spectroscopy}, issn = {2296-598X}, doi = {10.3389/fenrg.2021.799776}, url = {https://www.frontiersin.org/article/10.3389/fenrg.2021.799776}, author = {Shen, Xin and Yanagi, Rito and Solanki, Devan and Su, Haoqing and Li, Zhaohan and Xiang, Cheng-Xiang and Hu, Shu} } @article {1137, title = {Considerations for the Accurate Measurement of Incident Photon to Current Efficiency in Photoelectrochemical Cells}, journal = {Frontiers in Energy Research}, volume = {9}, year = {2022}, month = {2022}, abstract = {In this paper we review some of the considerations and potential sources of error when conducting Incident Photon to Current Efficiency (IPCE) measurements, with focus on photoelectrochemical (PEC) cells for water splitting. The PEC aspect introduces challenges for accurate measurements often not encountered in dry PV cells. These can include slow charge transfer dynamics and, depending on conditions (such as a white light bias, which is important for samples with non-linear response to light intensity), possible composition changes, mostly at the surface, that a sample may gradually undergo as a result of chemical interactions with the aqueous electrolyte. These can introduce often-overlooked dependencies related to the timing of the measurement, such as a slower measurement requirement in the case of slow charge transfer dynamics, to accurately capture the steady-state response of the system. Fluctuations of the probe beam can be particularly acute when a Xe lamp with monochromator is used, and longer scanning times also allow for appreciable changes in the sample environment, especially when the sample is under realistically strong white light bias. The IPCE measurement system and procedure need to be capable of providing accurate measurements under specific conditions, according to sample and operating requirements. To illustrate these issues, complications, and solution options, we present example measurements of hematite photoanodes, leading to the use of a motorized rotating mirror stage to solve the inherent fluctuation and drift-related problems. For an example of potential pitfalls in IPCE measurements of metastable samples, we present measurements of BiVO4 photoanodes, which had changing IPCE spectral shapes under white-light bias.}, keywords = {device characterisation, EQE, IPCE, measurement technique, photoelectrochemical}, issn = {2296-598X}, doi = {10.3389/fenrg.2021.726069}, url = {https://www.frontiersin.org/article/10.3389/fenrg.2021.726069}, author = {Ellis, David S. and Piekner, Yifat and Grave, Daniel A. and Schnell, Patrick and Rothschild, Avner} } @article {1138, title = {Crystallographic Effects of GaN Nanostructures in Photoelectrochemical Reaction}, journal = {Nano Letters}, volume = {22}, year = {2022}, note = {PMID: 35258977}, pages = {2236-2243}, keywords = {GaN; artificial photosynthesis; nanowire; photoelectrode; surface polarity}, doi = {10.1021/acs.nanolett.1c04220}, url = {https://doi.org/10.1021/acs.nanolett.1c04220}, author = {Xiao, Yixin and Vanka, Srinivas and Pham, Tuan Anh and Dong, Wan Jae and Sun, Yi and Liu, Xianhe and Navid, Ishtiaque Ahmed and Varley, Joel B. and Hajibabaei, Hamed and Hamann, Thomas W. and Ogitsu, Tadashi and Mi, Zetian} } @article {1140, title = {Formation of 6H-Ba3Ce0.75Mn2.25O9 During Thermochemical Reduction of 12R-Ba4CeMn3O12: Identification of a Polytype in the Ba(Ce,Mn)O3 Family}, journal = {Inorganic Chemistry}, volume = {61}, year = {2022}, month = {4}, keywords = {analytical chemistry, inorganic, layered perovskite, organic, oxide, physical, polytype, STCH, thermochemistry}, doi = {10.1021/acs.inorgchem.2c00282}, author = {Strange, Nicholas A. and Park, James Eujin and Goyal, Anuj and Bell, Robert T. and Trindell, Jamie A. and Sugar, Joshua D. and Stone, Kevin H. and Coker, Eric N. and Lany, Stephan and Shulda, Sarah and Ginley, David S.} } @article {1145, title = {Operational Limits of Redox Metal Oxides Performing Thermochemical Water Splitting}, journal = {Energy Technology}, volume = {10}, year = {2022}, pages = {2100222}, abstract = {Solar thermochemical hydrogen production is an attractive technology that stores intermittent solar energy in the form of chemical bonds. Efficient operation requires the identification of a redox-active metal oxide (MOx) material that can achieve high conversion of water to hydrogen at minimal energy input. Water splitting occurs by consecutive reduction and reoxidation reactions of MOx. MOx is reduced to MOx-δ and, in the second step, is reoxidized by water recovering the initial MOx and generate H2. The material must reduce at temperatures achievable in concentrated solar receiver/reactors, while maintaining a thermodynamic driving force to split water. At equilibrium, extent of reduction depends on temperature and oxygen partial pressure, and in this analysis, a set of thermodynamic properties, namely, enthalpy and entropy of oxygen vacancy formation, is sufficient to represent MOx. Herein, a method to easily classify materials based on these thermodynamic properties under any condition of oxygen partial pressure and temperature is presented. This method is based on fundamental thermodynamic principles and is applicable for any redox material with known thermodynamic properties. Despite the simplicity of the method, it is believed that this analysis will support future research in targeting thermodynamic properties of redox-active metal oxides.}, keywords = {Hydrogen production, solar energy, thermochemical cycles, thermodynamic properties, water splitting}, doi = {https://doi.org/10.1002/ente.202100222}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/ente.202100222}, author = {Bayon, Alicia and de la Calle, Alberto and Stechel, Ellen B. and Muhich, Christopher} } @article {1146, title = {Predicting Oxygen Off-Stoichiometry and Hydrogen Incorporation in Complex Perovskite Oxides}, journal = {Chemistry of Materials}, volume = {34}, year = {2022}, pages = {510-518}, keywords = {charge transfer resistance, Hydrogen Incorporation, Oxygen evolution reaction, Perovskite, Perovskite Oxides, Stoichiometry}, doi = {10.1021/acs.chemmater.0c04765}, url = {https://doi.org/10.1021/acs.chemmater.0c04765}, author = {Millican, Samantha L. and Deml, Ann M. and Papac, Meagan and Zakutayev, Andriy and O{\textquoteright}Hayre, Ryan and Holder, Aaron M. and Musgrave, Charles B. and Stevanovi{\'c}, Vladan} } @article {1150, title = {System and technoeconomic analysis of solar thermochemical hydrogen production}, journal = {Renewable Energy}, volume = {190}, year = {2022}, pages = {294-308}, abstract = {Hydrogen is a promising energy carrier that can be obtained from various feedstocks using renewable energy sources. Direct solar thermochemical hydrogen (STCH) production by water splitting can utilize the full spectrum of solar radiation and has the potential to achieve high solar energy conversion efficiencies. Currently STCH research areas focus on material discovery. This paper evaluates the performance of various STCH materials in the context of a system platform to assess techno-economic benefits and gaps in the path to STCH scale-up. To analyze the hydrogen production cost, a concentrating solar thermal (CST) system is introduced as a platform for integrating STCH materials and accommodating generalized thermochemical processes. The thermochemical process is based on a two-step STCH cycle using metal oxide that consists of a high temperature step for metal oxide reduction, followed by an oxidation step for water splitting at a lower temperature. A preferred configuration is to have the high temperature step occurring in a directly irradiated solar receiver reactor. To this end, we conceptualized a receiver design and associated solar field layout and investigated STCH operational boundaries, component costs and sensitivity parameters on the $2/kgH2 goal of hydrogen production. The study explored system-related variables and factors associated with scaling up. The CST platform allows more comprehensive studies that encompass aspects of STCH materials and systems such as cost, hydrogen productivity and replacement frequency, alongside other system components like heliostat field, tower, and potential receiver costs.}, keywords = {H2A analysis, Hydrogen production, Solar receiver, Solar thermochemical hydrogen production, Technoeconomic analysis, water splitting}, issn = {0960-1481}, doi = {https://doi.org/10.1016/j.renene.2022.03.108}, url = {https://www.sciencedirect.com/science/article/pii/S0960148122003925}, author = {Zhiwen Ma and Patrick Davenport and Genevieve Saur} } @article {1133, title = {A Thermogravimetric Temperature-Programmed Thermal Redox Protocol for Rapid Screening of Metal Oxides for Solar Thermochemical Hydrogen Production}, journal = {Frontiers in Energy Research}, volume = {10}, year = {2022}, month = {04}, pages = {856943}, keywords = {concentrated solar, hydrogen lcroduction, Perovskite, screening, thermogravimetry, water splitting}, doi = {10.3389/fenrg.2022.856943}, author = {Sanders, Michael and Bergeson-Keller, Anyka and Coker, Eric and O{\textquoteright}Hayre, Ryan} } @article {1111, title = {Development of a Photoelectrochemically Self-Improving Si/GaN Photocathode for Efficient and Durable H2 Production}, journal = {Nature Materials}, year = {2021}, month = {04/2021}, pages = {1-6}, doi = {10.1038/s41563-021-00965-w}, url = {https://doi.org/10.1038/s41563-021-00965-w}, author = {Guosong Zeng and Tuan Anh Pham and Srinivas Vanka and Guiji Liu and Chengyu Song and Jason K. Cooper and Zetian Mi and Tadashi Ogitsu and Francesca M. Toma} } @article {1119, title = {Double-Site Substitution of Ce Into (Ba, Sr)MnO3 Perovskites for Solar Thermochemical Hydrogen Production}, journal = {ACS Energy Letters}, volume = {6}, year = {2021}, pages = {3037-3043}, keywords = {Combinatorial synthesis, High-throughput experiments, Perovskites}, doi = {https://doi.org/10.1021/acsenergylett.1c01214}, author = {S. J. Heo and M. Sanders and R. O{\textquoteright}Hayre and A. Zakutayev} } @article {1156, title = {Energy Material Network Data Hubs}, journal = {International Journal of Advanced Computer Science and Applications}, volume = {12}, year = {2021}, abstract = {In early 2015 the United States Department of Energy conceived of a consortium of collaborative bodies based on shared expertise, data, and resources that could be targeted towards the more difficult problems in energy materials research. The concept of virtual laboratories had been envisioned and discussed earlier in the decade in response to the advent of the Materials Genome Initiative and similar scientific thrusts. To be effective, any virtual laboratory needed a robust method for data management, communication, security, data sharing, dissemination, and demonstration to work efficiently and effectively for groups of remote researchers. With the accessibility of new, easily deployed cloud technology and software frameworks, such individual elements could be integrated, and the required collaboration architecture is now possible. The developers have leveraged open-source software frameworks, customized them, and merged them into a platform to enable collaborative energy materials science, regardless of the geographic dispersal of the people and resources. After five years in operations, the systems are demonstratively an effective platform for enabling research within the Energy Material Networks (EMN). This paper will show the design and development of a secured scientific data sharing platform, the ability to customize the system to support diverse workflows, and examples of the enabled research and results connected with some of the Energy Material Networks.}, keywords = {cloud computing, consortium, data management, Energy materials research, network, virtual laboratories}, doi = {10.14569/IJACSA.2021.0120677}, url = {http://dx.doi.org/10.14569/IJACSA.2021.0120677}, author = {Robert R. White and Kristin Munch and Nicholas Wunder and Nalinrat Guba and Chitra Sivaraman and Kurt M. Van Allsburg and Huyen Dinh and Courtney Pailing} } @article {1117, title = {Factors Governing Oxygen Vacancy Formation in Oxide Perovskites}, journal = {Journal of the American Chemical Society}, volume = {143}, year = {2021}, pages = {13212-13227}, doi = {ttps://doi.org/10.1021/jacs.1c05570}, author = {R. B. Wexler and G. S. Gautam and E. B. Stechel and E. A. Carter} } @article {1158, title = {Influence of Supporting Electrolyte on Hydroxide Exchange Membrane Water Electrolysis Performance: Anolyte}, journal = {Journal of The Electrochemical Society}, volume = {168}, year = {2021}, month = {08/2021}, pages = {084512}, abstract = {Hydroxide-exchange-membrane water electrolysis (HEMWE) is an emerging hydrogen-production pathway that combines many advantages of incumbent alkaline water electrolysis (AWE) and proton-exchange-membrane water electrolysis (PEMWE). Advancement in HEMWE has been accelerated with the development of stable and conductive hydroxide exchange membranes (HEMs) and a more comprehensive understanding of alkaline gas-evolving kinetics. However, performance and durability without supporting electrolytes (SELs) remain inferior to PEMWE and AWE and little is known about the role and impact of the SELs. This study investigates the effects of SELs used as anolyte solutions in HEMWEs including cation-type, anion-type, SEL conductivity and pH, presence of carbonates and increased cation/OH- ratios on cell voltage and stability. We report our findings that (i) cell potential and high-frequency resistance did not correlate with anolyte SEL conductivity, (ii) cation-type influences cell voltage at low current densities (<50 mA cm-2) as predicted by half-cell measurements, (iii) increased cation/OH- ratio causes increased overpotentials, and (iv) carbonates are exchanged in the HEM but removed via self-purging at high current density. Overall, this study concludes that concentrated KOH is still the best SEL.}, keywords = {hydrogen production pathway, Hydroxide exchange membrane, incumbent alkaline, proton exchange membrane, supporting electrolytes, water electrolysis}, doi = {10.1149/1945-7111/ac1dcd}, url = {https://doi.org/10.1149/1945-7111/ac1dcd}, author = {Aleksandr Kiessling and Julie C. Fornaciari and Grace Anderson and Xiong Peng and Andreas Gerstmayr and Michael R. Gerhardt and Samuel McKinney and Alexey Serov and Yu Seung Kim and Barr Zulevi and Adam Z. Weber and Nemanja Danilovic} } @article {1159, title = {Layer-structured triple-conducting electrocatalyst for water-splitting in protonic ceramic electrolysis cells: Conductivities vs. activity}, journal = {Journal of Power Sources}, volume = {495}, year = {2021}, pages = {229764}, abstract = {Electron, proton and oxygen-triple-conducting materials are becoming the dominant steam electrode candidate to break the rate limit on the water-splitting reaction that throttles the performance of protonic ceramic electrolysis cells (PCECs). In this study, based on Pr2NiO4+δ Ruddlesden-Popper phase, we manipulate these conductivities by Pr-site Ba substitution to probe the correlation of each conductivity with the kinetics of the elementary reaction steps. It is found that the proton conductivity is vital to sustain an extended active surface area for faster adsorption of reactants and desorption of products. The effect of oxygen conductivity is surprisingly found insignificant in the water-splitting reaction. On the contrary, surface oxygen removal is discovered as the most rate-limiting process. The electronic conductivity is not a direct limiting factor. However, an electron transfer process between the current collector and the electrode junction could introduce extra resistance that is perceptible at a high operating temperature range. The best water-splitting activity is obtained on a proton conductivity/oxygen surface desorption capability well-balanced sample after Ba substitution. As a result, a water-splitting reaction resistance of 0.022 Ωcm2, a current density of 1.96 A/cm2 at 700~{\textdegree}C is achieved on Pr1.7Ba0.3NiO4+δ, one of the best performances for PCECs.}, keywords = {Hydrogen generation, Protonic ceramic electrolysis cells, Ruddlesden-popper phase, Triple-conducting electrocatalyst, Water-splitting}, issn = {0378-7753}, doi = {https://doi.org/10.1016/j.jpowsour.2021.229764}, url = {https://www.sciencedirect.com/science/article/pii/S0378775321003050}, author = {Wenyuan Li and Bo Guan and Tao Yang and Zhongqiu Li and Wangying Shi and Hanchen Tian and Liang Ma and Thomas L. Kalapos and Xingbo Liu} } @article {1116, title = {Performance and Limits of 2.0 eV Bandgap CuInGaS2 Solar Absorber Integrated With CdS Buffer on F:SnO2 Substrate for Multijunction Photovoltaic and Photoelectrochemical Water Splitting Devices}, volume = {2}, year = {2021}, pages = {5752-5763}, doi = {https://doi.org/10.1039/D1MA00570G}, author = {N. Gaillard and W. Septina and J. Varley and T. Ogitsu and K. K. Ohtaki and H. A. Ishii and J. P. Bradley and C. Muzzillo and K. Zhu and F. Babbe and J. Cooper} } @article {1162, title = {Performance Indicators for Benchmarking Solar Thermochemical Fuel Processes and Reactors}, journal = {Frontiers in Energy Research}, volume = {9}, year = {2021}, abstract = {Concentrated solar energy offers a source for renewable high-temperature process heat that can be used to efficiently drive endothermic chemical processes, converting the entire spectrum of solar radiation into chemical energy. In particular, solar-driven thermochemical processes for the production of fuels include reforming of methane and other hydrocarbons, gasification of biomass, coal, and other carbonaceous feedstock, and metal oxide redox cycles for splitting H2O and CO2. A notable issue in the development of these processes and their associated solar reactors is the lack of consistent reporting methods for experimental demonstrations and modelling studies, which complicates the benchmarking of the corresponding technologies. In this work we formulate dimensionless performance indicators based on mass and energy balances of such reacting systems, namely: energy efficiency, conversion extent, selectivity, and yield. Examples are outlined for the generic processes mention above. We then provide guidelines for reporting on such processes and reactors and suggest performance benchmarking on four key criteria: energy efficiency, conversion extent, product selectivity, and performance stability.}, keywords = {benchmarking, concentrated solar power, solar fuels and chemicals, solar reactors, thermochemical processes}, issn = {2296-598X}, doi = {10.3389/fenrg.2021.677980}, url = {https://www.frontiersin.org/article/10.3389/fenrg.2021.677980}, author = {Bulfin, Brendan and Miranda, Miguel and Steinfeld, Aldo} } @article {1163, title = {Phase formation of manganese oxide thin films using pulsed laser deposition}, journal = {Mater. Adv.}, volume = {2}, year = {2021}, pages = {303-309}, abstract = {Manganese oxides have enabled a wide range of technologies including oxygen evolution catalysts, lithium ion batteries, and thermochemical water splitting. However, the variable oxidation state and rich polymorphism of manganese oxides make it difficult to find the processing conditions to target a particular phase of manganese oxide. Targeted synthesis requires a more complete understanding of the phase space and the impact of multiple processing variables on phase formation. Here, we demonstrate the impact of substrate temperature, total deposition pressure, partial pressure of oxygen, and target composition on the phase formation of manganese oxides grown using combinatorial pulsed laser deposition (PLD). Thin films were deposited from a MnO, Mn2O3 or MnO2 target onto amorphous glass substrates with a continuously varied temperature provided by a combinatorial heater. A combination of X-ray diffraction, Rutherford backscattering spectroscopy, and Raman and Fourier transform infrared (FTIR) spectroscopies were used to determine the phases present in the samples. The oxygen partial pressure was found to be the critical factor determining phase formation, while the total pressure, target composition, and substrate temperature have smaller and more complex effects on phase formation. Comparing the results of this work to the published temperature{\textendash}pressure phase diagrams shows that the PLD thin films vary significantly from the expected equilibrium phases of either the bulk materials or nanoparticles. These results suggest that PLD provides a route to capture phases of manganese oxides at lower temperatures or higher oxygen pressures than those required for bulk synthesis or solution processing.}, keywords = {Combinatorial, Manganese oxides, Pulsed laser deposition, STCH}, doi = {10.1039/D0MA00417K}, url = {http://dx.doi.org/10.1039/D0MA00417K}, author = {Garten, Lauren M. and Selvarasu, Praneetha and Perkins, John and Ginley, David and Zakutayev, Andriy} } @article {1118, title = {Reduction Thermodynamics of Sr1-xCexMnO3 and CexSr2-xMnO4 Perovskites for Solar Thermochemical Hydrogen Production}, journal = {Energy Technology}, year = {2021}, doi = {https://doi.org/10.1002/ente.202100515}, author = {A. M. Bergeson-Keller and M. D. Sanders and R. P. O{\textquoteright}Hayre} } @article {1165, title = {Scaleup and manufacturability of symmetric-structured metal-supported solid oxide fuel cells}, journal = {Journal of Power Sources}, volume = {489}, year = {2021}, pages = {229439}, abstract = {Metal-supported solid oxide fuel cells with symmetric architecture, having metal supports on both sides of the cell, are scaled up from button cell size to large 50~cm2 active area cell size. The cells remain flat after sintering assisted by the symmetric structure. Equivalent performance is achieved for button cells and large cells, and thermal cycling and redox cycling tolerance are demonstrated for the large cells. The catalyst infiltration process is improved to enable high-throughput manufacturing. The cumbersome lab-scale molten nitrate infiltration process is replaced with a room-temperature process in which a shelf-stable aqueous solution of nitrate salts is applied to the cell by spraying, painting, or other scalable techniques. A fast-ramp thermal conversion of the nitrate salts to the final oxide catalyst composition is implemented, allowing many infiltration cycles to be accomplished in a single work shift. Increasing the number of infiltration cycles from 5 to 10 led to an increase in peak power density from approximately 0.3 to 0.52~W~cm-2.}, keywords = {infiltration, Metal-supported, Scale up, SOFC}, issn = {0378-7753}, doi = {https://doi.org/10.1016/j.jpowsour.2020.229439}, url = {https://www.sciencedirect.com/science/article/pii/S0378775320317225}, author = {Emir Dogdibegovic and Yuan Cheng and Fengyu Shen and Ruofan Wang and Boxun Hu and Michael C. Tucker} } @article {1121, title = {Techno-Economic Analysis of Thermochemical Water-Splitting System for Co-Production of Hydrogen and Electricity}, journal = {International Journal of Hydrogen Energy}, volume = {46}, year = {2021}, pages = {1656-1670}, keywords = {Techno-economic analysis}, doi = {https://doi.org/10.1016/j.ijhydene.2020.10.060}, author = {V. K. Budama and N. G. Johnson and I. Ermanoski and E. B. Stechel} } @article {1080, title = {Addressing the Stability Gap in Photoelectrochemistry: Molybdenum Disulfide Protective Catalysts for Tandem III{\textendash}V Unassisted Solar Water Splitting}, journal = {ACS Energy Letters}, year = {2020}, month = {07/2020}, pages = {2631-2640}, doi = {10.1021/acsenergylett.0c01132}, url = {https://doi.org/10.1021/acsenergylett.0c01132}, author = {Micha Ben-Naim and Reuben J. Britto and Chase W. Aldridge and Rachel Mow and Myles A. Steiner and Adam C. Nielander and Laurie A. King and Daniel J. Friedman and Todd G. Deutsch and James L. Young and Thomas F. Jaramillo} } @article {1168, title = {Deconvolution of Water-Splitting on the Triple-Conducting Ruddlesden{\textendash}Popper-Phase Anode for Protonic Ceramic Electrolysis Cells}, journal = {ACS Applied Materials \& Interfaces}, volume = {12}, year = {2020}, note = {PMID: 33079527}, pages = {49574-49585}, keywords = {atomic layer, proton conductors, relaxation time distribution, ruddlesden-popper phase, steam electrolysis, triple-conducting}, doi = {10.1021/acsami.0c12987}, url = {https://doi.org/10.1021/acsami.0c12987}, author = {Tian, Hanchen and Li, Wenyuan and Ma, Liang and Yang, Tao and Guan, Bo and Shi, Wangying and Kalapos, Thomas L. and Liu, Xingbo} } @article {1170, title = {Emergent Degradation Phenomena Demonstrated on Resilient, Flexible, and Scalable Integrated Photoelectrochemical Cells}, journal = {Advanced Energy Materials}, volume = {10}, year = {2020}, pages = {2002706}, abstract = {Abstract Photoelectrochemical (PEC) water splitting provides a pathway to generate sustainable clean fuels using the two most abundant resources on Earth: sunlight and water. Currently, most of the successful models of PEC cells are still fabricated on small scales near 1 cm2, which largely limits the mass deployment of solar-fuel production. Here, the scale-up to 8 cm2 of an integrated PEC (IPEC) device is demonstrated and its performance compared to a 1 cm2 IPEC cell, using state-of-the-art iridium and platinum catalysts with III{\textendash}V photoabsorbers. The initial photocurrents at 1 sun are 8 and 7 mA cm-2 with degradation rates of 0.60 and 0.47 mA cm-2 day-1, during unbiased operation for the 1 and 8 cm2 devices, respectively. Evaluating under outdoor and indoor conditions at two U.S. National Laboratories reveals similar results, evidencing the reproducibility of this design{\textquoteright}s performance. Furthermore, the emerging degradation mechanisms during scale-up are investigated and the knowledge gained from this work will provide feedback to the broader community, since PEC device durability is a limiting factor in its potential future deployment.}, keywords = {durability, on-sun testing, PEC cell scale-up, reproducibility, water splitting}, doi = {https://doi.org/10.1002/aenm.202002706}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/aenm.202002706}, author = {Kistler, Tobias A. and Zeng, Guosong and Young, James L. and Weng, Lien-Chun and Aldridge, Chase and Wyatt, Keenan and Steiner, Myles A. and Solorzano Jr., Oscar and Houle, Frances A. and Toma, Francesca M. and Weber, Adam Z. and Deutsch, Todd G. and Danilovic, Nemanja} } @article {1171, title = {Enhancement of Ni-(Y2O3)0.08(ZrO2)0.92 fuel electrode performance by infiltration of Ce0.8Gd0.2O2-: δ nanoparticles}, journal = {Journal of Materials Chemistry A}, volume = {8}, year = {2020}, note = {Funding Information: The authors gratefully acknowledge research support from the HydroGEN Advanced Water Splitting Materials Consortium, established as part of the Energy Materials Network under the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Fuel Cell Technologies Office, under Award Number DE-0008079. The electrochemical modeling work was supported nancially by the Department of Energy National Energy Technology Laboratory under Prime Award Number DE-FE0027584 to FuelCell Energy, Inc., and under Subaward to Northwestern University. Some of the microstructural characterization was supported by National Science Foundation grants DMR-1506925 and DMR-1912530. Publisher Copyright: {\textcopyright} 2020 The Royal Society of Chemistry.}, pages = {4099{\textendash}4106}, abstract = {This paper addresses the use of Ce0.8Gd0.2O2-δ (GDC) infiltration into the Ni-(Y2O3)0.08(ZrO2)0.92 (YSZ) fuel electrode of solid oxide cells (SOCs) for improving their electrochemical performance in fuel cell and electrolysis operation. Although doped ceria infiltration into Ni-YSZ has recently been shown to improve the electrode performance and stability, the mechanisms defining how GDC impacts electrochemical characteristics are not fully delineated. Furthermore, the electrochemical characteristics have not yet been determined over the full range of conditions normally encountered in fuel cell and electrolysis operation. Here we present a study of both symmetric and full cells aimed at understanding the electrochemical mechanisms of GDC-modified Ni-YSZ over a wide range of fuel compositions and temperatures. Single-step GDC infiltration at an appropriate loading substantially reduced the polarization resistance of Ni-YSZ electrodes in electrolyte-supported cells, as measured using electrochemical impedance spectroscopy (EIS) at various temperatures (600-800 {\textdegree}C) in a range of H2O-H2 mixtures (3-90 vol\% H2O). Fuel-electrode-supported cells had significant concentration polarization due to the thick Ni-YSZ supports. A distribution of relaxation times approach is used to develop a physically-based electrochemical model; the results show that GDC reduces the reaction resistance associated with three-phase boundaries, but also appears to improve oxygen transport in the electrode. Increasing the H2O fraction in the H2-H2O fuel mixture reduced both the three-phase boundary resistance and the gas diffusion resistance for Ni-YSZ; with GDC infiltration, the electrode resistance showed less variation with fuel composition. GDC infiltration improved the performance of fuel-electrode-supported full cells, which yielded a maximum power density of 2.28 W cm-2 in fuel cell mode and an electrolysis current density at 1.3 V of 2.22 A cm-2, both at 800 {\textdegree}C.}, keywords = {HTE; SOEC; Yttria-stabilized zirconia}, issn = {2050-7488}, doi = {10.1039/c9ta12316d}, author = {Park, Beom Kyeong and Roberto Scipioni and Dalton Cox and Barnett, Scott A.} } @article {1125, title = {Exploring Ca{\textendash}Ce{\textendash}M{\textendash}O (M = 3d Transition Metal) Oxide Perovskites for Solar Thermochemical Applications}, journal = {Chemistry of Materials}, volume = {32}, year = {2020}, pages = {9964-9982}, keywords = {Perovskites, Theory-driven materials discovery}, doi = {https://doi.org/10.1021/acs.chemmater.0c02912}, author = {G. Sai Gautam and E. B. Stechel and E. A. Carter} } @article {1129, title = {A First-Principles-Based Sub-Lattice Formalism for Predicting Off-Stoichiometry in Materials for Solar Thermochemical Applications: The Example of Ceria}, journal = {Advanced Theory and Simulations}, volume = {3}, year = {2020}, keywords = {off-stoichiometric materials, sub-lattice models, thermodynamic modeling}, doi = {https://doi.org/10.1002/adts.202000112}, author = {G. Sai Gautam and E. B. Stechel and E. A. Carter} } @article {1087, title = {Highly efficient and durable III{\textendash}V semiconductor-catalyst photocathodes via a transparent protection layer}, journal = {Sustainable Energy Fuels}, volume = {4}, year = {2020}, pages = {1437-1442}, abstract = {

Durable performance and high efficiency in solar-driven water splitting are great challenges not yet co-achieved in photoelectrochemical (PEC) cells. Although photovoltaic cells made from III{\textendash}V semiconductors can achieve high optical{\textendash}electrical conversion efficiency, their functional integration with electrocatalysts and operational lifetime remain great challenges. Herein, an ultra-thin TiN layer was used as a diffusion barrier on a buried junction n+p-GaInP2 photocathode, to enable elevated temperatures for subsequent catalyst growth of Ni5P4 as nano-islands without damaging the GaInP2 junction. The resulting PEC half-cell showed negligible absorption loss, with saturated photocurrent density and H2 evolution equivalent to the benchmark photocathode decorated with PtRu catalysts. High corrosion-resistant Ni5P4/TiN layers showed undiminished photocathode operation over 120 h, exceeding previous benchmarks. Etching to remove electrodeposited copper, an introduced contaminant, restored full performance, demonstrating operational ruggedness. The TiN layer expands the synthesis conditions and protects against corrosion for stable operation of III{\textendash}V PEC devices, while the Ni5P4 catalyst replaces costly and scarce noble metal catalysts.

}, doi = {10.1039/C9SE01264H}, url = {http://dx.doi.org/10.1039/C9SE01264H}, author = {Shinjae Hwang and James L. Young and Rachel Mow and Anders B. Laursen and Mengjun Li and Hongbin Yang and Philip E. Batson and Martha Greenblatt and Myles A. Steiner and Daniel Friedman and Todd G. Deutsch and Eric Garfunkel and G. Charles Dismukes} } @article {1172, title = {Highly quaternized polystyrene ionomers for high performance anion exchange membrane water electrolysers}, journal = {Nature Energy}, volume = {5}, year = {2020}, month = {3}, keywords = {LTE; AEM electrolysis; Novel ionomer}, doi = {10.1038/s41560-020-0577-x}, author = {Kim, Yu Seung and Li, Dongguo and Park, Eun Joo and Wenlei, Zhu and Qiurong, Shi and Zhou, Yang and Tian, Hangyu and Lin, Yuehe and Serov, Alexey and Zulevi, Barr and Baca, Ehren Donel and Fujimoto, Cy and Chung, Hoon} } @article {1124, title = {High-Throughput Analysis of Materials for Chemical Looping Processes}, journal = {Advanced Energy Materials}, volume = {10}, year = {2020}, keywords = {chemical looping, high-throughput screening, machine learning, redox catalysis}, doi = {https://doi.org/10.1002/aenm.202000685}, author = {N. R. Singstock and C. J. Bartel and A. M. Holder and C. B. Musgrave} } @article {1122, title = {Improved Performance and Efficiency of Lanthanum{\textendash}Strontium{\textendash}Manganese Perovskites Undergoing Isothermal Redox Cycling under Controlled pH2O/pH2}, journal = {Energy \& Fuels}, volume = {34}, year = {2020}, pages = {16918-16926}, keywords = {Experimental, Isothermal cycling, Perovskites}, doi = {https://doi.org/10.1021/acs.energyfuels.0c02872}, author = {K. Lee and D. C. McCord and R. J. Carrillo and B. Guyll and J. R. Scheffe} } @article {1173, title = {Interfacial Electromechanics Predicts Phase Behavior of 2D Hybrid Halide Perovskites}, journal = {ACS Nano}, volume = {14}, year = {2020}, note = {PMID: 32073821}, pages = {3353-3364}, keywords = {PEC; Perovskites; Modeling}, doi = {10.1021/acsnano.9b09105}, url = {https://doi.org/10.1021/acsnano.9b09105}, author = {Price, Christopher C. and Blancon, Jean-Christophe and Mohite, Aditya D. and Shenoy, Vivek B.} } @article {1128, title = {Oxidation Kinetics of Hercynite Spinels for Solar Thermochemical Fuel Production}, journal = {Chemical Engineering Journal}, volume = {401}, year = {2020}, keywords = {Hercynite, In situ XPS, Reaction kinetics, Solar thermal, Thermochemical analysis}, doi = {https://doi.org/10.1016/j.cej.2020.126015}, author = {S. L. Millican and I. Androshchuk and J. T. Tran and R. M. Trottier and A. Bayon and Y. Al Salik and H. Idriss and C. B. Musgrave and A. W. Weimer} } @article {1176, title = {Self-sustainable protonic ceramic electrochemical cells using a triple conducting electrode for hydrogen and power production}, journal = {Nature Communications}, volume = {11}, year = {2020}, month = {4}, keywords = {HTE; SOEC; Proton exchange membrane electrolysis cell; PrNi0.5Co0.5O3-δ perovskite}, doi = {10.1038/s41467-020-15677-z}, author = {Ding, Hanping and Wu, Wei and Jiang, Chao and Ding, Yong and Bian, Wenjuan and Hu, Boxun and Singh, Prabhakar and Orme, Christopher J. and Wang, Lucun and Zhang, Yunya and Ding, Dong} } @article {1167, title = {Triple ionic{\textendash}electronic conducting oxides for next-generation electrochemical devices}, journal = {Nature Materials}, volume = {20}, year = {2020}, month = {12/2020}, keywords = {electrolysis cells, fuel cells, ionic species transport, membrane reactors, Triple ionic{\textendash}electronic conductors}, issn = {1476-1122}, doi = {10.1038/s41563-020-00854-8}, url = {https://www.osti.gov/biblio/1762454}, author = {Papac, Meagan and Stevanovi{\'c}, Vladan and Zakutayev, Andriy and O{\textquoteright}Hayre, Ryan} } @article {1180, title = {Water-Stable 1D Hybrid Tin(II) Iodide Emits Broad Light with 36\% Photoluminescence Quantum Efficiency}, journal = {Journal of the American Chemical Society}, volume = {142}, year = {2020}, note = {PMID: 32283025}, pages = {9028-9038}, keywords = {Modeling, PEC, Perovskites}, doi = {10.1021/jacs.0c03004}, url = {https://doi.org/10.1021/jacs.0c03004}, author = {Spanopoulos, Ioannis and Hadar, Ido and Ke, Weijun and Guo, Peijun and Sidhik, Siraj and Kepenekian, Mika{\"e}l and Even, Jacky and Mohite, Aditya D. and Schaller, Richard D. and Kanatzidis, Mercouri G.} } @article {1185, title = {Ferritic stainless steel interconnects for protonic ceramic electrochemical cell stacks: Oxidation behavior and protective coatings}, journal = {International Journal of Hydrogen Energy}, volume = {44}, year = {2019}, pages = {25297-25309}, abstract = {Protonic ceramic fuel or electrolysis cells (PCFC/PCEC) have shown promising performance at intermediate temperatures. However, these technologies have not yet been demonstrated in a stack, hence the oxidation behavior of the metallic interconnect under relevant operating environments is unknown. In this work, ferritic stainless steels 430 SS, 441 SS, and Crofer 22 APU were investigated for their use as interconnect materials in the PCFC/PCEC stack. The bare metal sheets were exposed to a humidified air environment in the temperature range from 450~{\textdegree}C to 650~{\textdegree}C, to simulate their application in a PCFC cathode or PCEC anode. Breakaway oxidation with rapid weight gain and Fe outward diffusion/oxidation was observed on all the selected stainless steel materials. A protective coating is deemed necessary to prevent the metallic interconnect from oxidizing. To mitigate the observed breakaway oxidation, state-of-the-art protective coatings, Y2O3, Ce0.02Mn1.49Co1.49O4, CuMn1.8O4 and Ce/Co, were applied to the stainless steel sheets and their oxidation resistance was investigated. Dual atmosphere testing further validated the effectiveness of the protective coatings in realistic PCFC/PCEC environments, with a hydrogen gradient across the interconnect. Several combinations of metal and coating material were found to be viable for use as the interconnect for PCFC/PCEC stacks.}, keywords = {Dual atmosphere, Interconnect oxidation, Oxidation, Protective coatings, Protonic ceramic electrolysis cell, Protonic ceramic fuel cell}, issn = {0360-3199}, doi = {https://doi.org/10.1016/j.ijhydene.2019.08.041}, url = {https://www.sciencedirect.com/science/article/pii/S0360319919329581}, author = {Ruofan Wang and Zhihao Sun and Jung-Pyung Choi and Soumendra N. Basu and Jeffry W. Stevenson and Michael C. Tucker} } @article {1081, title = {An In0.42Ga0.58N tunnel junction nanowire photocathode monolithically integrated on a nonplanar Si wafer}, journal = {Nano Energy}, volume = {57}, year = {2019}, pages = {405-413}, abstract = {

Published on March 1st, 2019. Group III-nitride semiconductors exhibit many ideal characteristics for solar water splitting, including a tunable energy bandgap across nearly the entire solar spectrum and suitable band edge positions for water oxidation and proton reduction under visible and near-infrared light irradiation. To date, however, the best reported energy conversion efficiency for III-nitride semiconductor photocathodes is still below 1\%. Here we report on the demonstration of a relatively efficient p-type In0.42Ga0.58N photocathode, which is monolithically integrated on an n-type nonplanar Si wafer through a GaN nanowire tunnel junction. The open pillar design, together with the nonplanar Si wafer can significantly maximize light trapping, whereas the tunnel junction reduces the interfacial resistance and enhances the extraction of photo-generated electrons. In addition, photodeposited Pt nanoparticles on InGaN nanowire surfaces significantly improve the cathodic performance. The nanowire photocathode exhibits a photocurrent density of 12.3 mA cm-2 at 0 V vs. RHE and an onset potential of 0.79 V vs. RHE under AM 1.5 G one-sun illumination. The maximum applied bias photon-to-current efficiency reaches 4\% at ~0.52 V vs. RHE, which is one order of magnitude higher than the previously reported values for III-nitride photocathodes. Significantly, no performance degradation was measured for over 30 h solar water splitting with a steady photocurrent density ~12 mA cm-2 without using any extra surface protection, which is attributed to the spontaneous formation of N-terminated surfaces of InGaN nanowires to protect against photocorrosion.

}, issn = {2211-2855}, doi = {10.1016/j.nanoen.2018.12.067}, url = {http://www.sciencedirect.com/science/article/pii/S2211285518309807}, author = {Yongjie Wang and Srinivas Vanka and Jiseok Gim and Yuanpeng Wu and Ronglei Fan and Yazhou Zhang and Jinwen Shi and Mingrong Shen and Robert Hovden and Zetian Mi} } @article {1065, title = {Initial approaches in benchmarking and round robin testing for proton exchange membrane water electrolyzers}, journal = {International Journal of Hydrogen Energy}, volume = {44}, year = {2019}, month = {04/2019}, pages = {9174-9187}, abstract = {

Published on April 5th, 2019. As ever-increasing amounts of renewable electricity enter the energy supply mix on a regional, national and international basis, greater emphasis is being placed on energy conversion and storage technologies to deal with the oscillations, excess and lack of electricity. Hydrogen generation via proton exchange membrane water electrolysis (PEMWE) is one technology that offers a pathway to store large amounts of electricity in the form of hydrogen. The challenges to widespread adoption of PEM water electrolyzers lie in their high capital and operating costs which both need to be reduced through R\&D. An evaluation of reported PEMWE performance data in the literature reveals that there are excessive variations of in situ performance results that make it difficult to draw conclusions on the pathway forward to performance optimization and future R\&D directions. To enable the meaningful comparison of in situ performance evaluation across laboratories there is an obvious need for standardization of materials and testing protocols. Herein, we address this need by reporting the results of a round robin test effort conducted at the laboratories of five contributors to the IEA Electrolysis Annex 30. For this effort a method and equipment framework were first developed and then verified with respect to its feasibility for measuring water electrolysis performance accurately across the various laboratories. The effort utilized identical sets of test articles, materials, and test cells, and employed a set of shared test protocols. It further defined a minimum skeleton of requirements for the test station equipment. The maximum observed deviation between laboratories at 1\ A\ cm-2 at cell temperatures of 60\ {\textdegree}C and 80\ {\textdegree}C was 27 and 20\ mV, respectively. The deviation of the results from laboratory to laboratory was 2{\textendash}3 times higher than the lowest deviation observed at one single lab and test station. However, the highest deviations observed were one-tenth of those extracted by a literature survey on similar material sets. The work endorses the urgent need to identify one or more reference sets of materials in addition to the method and equipment framework introduced here, to enable accurate comparison of results across the entire community. The results further imply that cell temperature control appears to be the most significant source of deviation between results, and that care must be taken with respect to break-in conditions and cell electrical connections for meaningful performance data.

}, issn = {0360-3199}, doi = {10.1016/j.ijhydene.2019.02.074}, url = {http://www.sciencedirect.com/science/article/pii/S0360319919306585}, author = {G. Bender and M. Carmo and T. Smolinka and A. Gago and N. Danilovic and M. Mueller and F. Ganci and A. Fallisch and P. Lettenmeier and K. A. Friedrich and K. Ayers and B. Pivovar and J. Mergel and D. Stolten} } @article {796, title = {Integrated Membrane-Electrode-Assembly Photoelectrochemical Cell under Various Feed Conditions for Solar Water Splitting}, journal = {Journal of The Electrochemical Society}, volume = {166}, year = {2019}, note = {

{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n\ \n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright}

}, pages = {H3020-H3028}, issn = {0013-4651, 1945-7111}, doi = {10.1149/2.0041905jes}, url = {http://jes.ecsdl.org/lookup/doi/10.1149/2.0041905jes}, author = {Tobias A. Kistler and David Larson and Karl Walczak and Peter Agbo and Ian D. Sharp and Adam Z. Weber and Nemanja Danilovic} } @article {1066, title = {Interfacial Analysis of PEM Electrolyzer Using X-ray Computed Tomography}, journal = {Sustainable Energy \& Fuels}, year = {2019}, doi = {10.1039/C9SE00364A}, url = {https://pubs.rsc.org/en/content/articlelanding/2019/se/c9se00364a}, author = {Emily Leonard and Andrew D.~Shum and Nemaja Danilovic and Christopher Capuano and Katherine E.~Ayers and Lalit Pant and Adam Z Weber and Xianghui Xiao and Dilworth Parkinson and Iryna V~Zenyuk} } @article {1187, title = {Interfacial engineering of gallium indium phosphide photoelectrodes for hydrogen evolution with precious metal and non-precious metal based catalysts}, journal = {Journal of Materials Chemistry A}, volume = {7}, year = {2019}, pages = {16821-16832}, abstract = {Gallium indium phosphide (GaInP2) is a semiconductor with promising optical and electronic properties to serve as the large bandgap, top junction in a dual absorber tandem solar water splitting device. Poor intrinsic catalytic ability and surface corrosion in aqueous electrolyte remain key obstacles. Significant progress has been made developing thin-film protection layers and active catalysts for photoelectrochemical devices, but combining these into a catalytic protection layer that can provide long-term stability without sacrificing performance has proven difficult due, in large part, to challenges in developing active and stable interfaces. In this work, we demonstrate that a nanoscale molybdenum disulfide (MoS2) film functions both as an effective protection layer and excellent hydrogen evolution catalyst for GaInP2 photocathodes, with only a \~{}10\% loss in initial light-limited current density after 100 h, and a photocurrent onset potential better than that of the same state-of-the-art device with a platinum{\textendash}ruthenium catalyst. Using transient photoreflectance spectroscopy, we probed the carrier dynamics of these photocathodes and show that the MoS2 coated device exhibits improved electron transfer at the surface interface compared to the PtRu catalyzed device. These MoS2 protected devices are among the most active and stable single-absorber photocathodes for solar water splitting to date and offer a promising pathway towards generating hydrogen with high efficiency and significant longevity.}, keywords = {durability, GaInP2, III-V, MoS2 hydrogen evolution catalyst, MoS2 protective coating, PEC, Photocathode}, doi = {10.1039/C9TA05247J}, url = {http://dx.doi.org/10.1039/C9TA05247J}, author = {Britto, Reuben J. and Young, James L. and Yang, Ye and Steiner, Myles A. and LaFehr, David T. and Friedman, Daniel J. and Beard, Mathew and Deutsch, Todd G. and Jaramillo, Thomas F.} } @article {1188, title = {Long-term stability studies of a semiconductor photoelectrode in three-electrode configuration}, journal = {Journal of Materials Chemistry A}, volume = {7}, year = {2019}, pages = {27612-27619}, abstract = {Improving the stability of semiconductor materials is one of the major challenges for sustainable and economic photoelectrochemical water splitting. N-terminated GaN nanostructures have emerged as a practical protective layer for conventional high efficiency but unstable Si and III{\textendash}V photoelectrodes due to their near-perfect conduction band-alignment, which enables efficient extraction of photo-generated electrons, and N-terminated surfaces, which protects against chemical and photo-corrosion. Here, we demonstrate that Pt-decorated GaN nanostructures on an n+{\textendash}p Si photocathode can exhibit an ultrahigh stability of 3000 h (i.e., over 500 days for usable sunlight \~{}5.5 h per day) at a large photocurrent density (>35 mA cm-2) in three-electrode configuration under AM 1.5G one-sun illumination. The measured applied bias photon-to-current efficiency of 11.9\%, with an excellent onset potential of \~{}0.56 V vs. RHE, is one of the highest values reported for a Si photocathode under AM 1.5G one-sun illumination. This study provides a paradigm shift for the design and development of semiconductor photoelectrodes for PEC water splitting: stability is no longer limited by the light absorber, but rather by co-catalyst particles.}, keywords = {durability, GaN nanowires, PEC, Photocathode, Pt hydrogen evolution catalyst, Silicon}, doi = {10.1039/C9TA09926C}, url = {http://dx.doi.org/10.1039/C9TA09926C}, author = {Vanka, Srinivas and Sun, Kai and Zeng, Guosong and Pham, Tuan Anh and Toma, Francesca Maria and Ogitsu, Tadashi and Mi, Zetian} } @article {1074, title = {New tolerance factor to predict the stability of perovskite oxides and halides}, journal = {Science Advances}, volume = {5}, year = {2019}, note = {

Copyright {\textcopyright} 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY).. This is an open-access article distributed under the terms of the Creative Commons Attribution license, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

}, month = {02/2019}, pages = {eaav0693}, abstract = {

Published on February 1st, 2019. Predicting the stability of the perovskite structure remains a long-standing challenge for the discovery of new functional materials for many applications including photovoltaics and electrocatalysts. We developed an accurate, physically interpretable, and one-dimensional tolerance factor, τ, that correctly predicts 92\% of compounds as perovskite or nonperovskite for an experimental dataset of 576 ABX3 materials (X = O2-, F-, Cl-, Br-, I-) using a novel data analytics approach based on SISSO (sure independence screening and sparsifying operator). τ is shown to generalize outside the training set for 1034 experimentally realized single and double perovskites (91\% accuracy) and is applied to identify 23,314 new double perovskites (A2BB'X6) ranked by their probability of being stable as perovskite. This work guides experimentalists and theorists toward which perovskites are most likely to be successfully synthesized and demonstrates an approach to descriptor identification that can be extended to arbitrary applications beyond perovskite stability predictions. Simple and interpretable data-driven descriptor accurately predicts the synthesizability of single and double perovskites.

}, issn = {2375-2548}, doi = {10.1126/sciadv.aav0693}, url = {https://advances.sciencemag.org/content/5/2/eaav0693}, author = {Christopher J. Bartel and Christopher Sutton and Bryan R. Goldsmith and Runhai Ouyang and Charles B. Musgrave and Luca M. Ghiringhelli and Matthias Scheffler} } @article {1075, title = {Phase Identification of the Layered Perovskite CexSr2{\textendash}xMnO4 and Application for Solar Thermochemical Water Splitting}, journal = {Inorganic Chemistry}, volume = {58}, year = {2019}, pages = {7705-7714}, abstract = {

Published on June 17th, 2019. Ruddlesden{\textendash}Popper (layered perovskite) phases are attracting significant interest because of their unique potential for many applications requiring mixed ionic and electronic conductivity. Here we report a new, previously undiscovered layered perovskite of composition, CexSr2{\textendash}xMnO4 (x = 0.1, 0.2, and 0.3). Furthermore, we demonstrate that this new system is suitable for solar thermochemical hydrogen production (STCH). Synchrotron radiation X-ray diffraction and transmission electron microscopy are performed to characterize this new system. Density functional theory calculations of phase stability and oxygen vacancy formation energy (1.76, 2.24, and 2.66 eV/O atom, respectively with increasing Ce content) reinforce the potential of this phase for STCH application. Experimental hydrogen production results show that this materials system produces 2{\textendash}3 times more hydrogen than the benchmark STCH oxide ceria at a reduction temperature of 1400 {\textdegree}C and an oxidation temperature of 1000 {\textdegree}C.

}, issn = {0020-1669}, doi = {10.1021/acs.inorgchem.8b03487}, url = {https://doi.org/10.1021/acs.inorgchem.8b03487}, author = {Debora R. Barcellos and Francisco G. Coury and Antoine Emery and Michael Sanders and Jianhua Tong and Anthony McDaniel and Christopher Wolverton and Michael Kaufman and Ryan O{\textquoteright}Hayre} } @article {1190, title = {Photoelectrochemical water splitting using strain-balanced multiple quantum well photovoltaic cells}, journal = {Sustainable Energy Fuels}, volume = {3}, year = {2019}, pages = {2837-2844}, abstract = {Starting from the classical GaInP/GaAs tandem photoelectrochemical water splitting device, higher solar-to-hydrogen efficiencies can be pursued by extending photon absorption to longer wavelengths. We incorporate strain-balanced GaInAs/GaAsP quantum wells into the bottom GaAs junction, to increase the range of photon absorption. The inclusion of 1.34 eV quantum wells in the depletion region of the bottom cell extends the absorption edge to 930 nm. With a corresponding increase in the thickness of the top cell for current matching, the light-limiting photocurrent increases by >8\%. The estimated solar-to-hydrogen efficiency is 13.6 {\textpm} 0.5\%, and we show a pathway to further improvement. With the semiconductor device remaining on the growth substrate, this quantum well architecture may enable improved stability and durability of the photoelectrochemical electrodes.}, keywords = {durability, National Renewable Energy Lab (NREL), PEC, photoelectrochemical water splitting}, doi = {10.1039/C9SE00276F}, url = {http://dx.doi.org/10.1039/C9SE00276F}, author = {Steiner, Myles A. and Barraugh, Collin D. and Aldridge, Chase W. and Alvarez, Isabel Barraza and Friedman, Daniel J. and Ekins-Daukes, Nicholas J. and Deutsch, Todd G. and Young, James L.} } @article {1191, title = {Progress in Metal-Supported Solid Oxide Fuel Cells and Electrolyzers with Symmetric Metal Supports and Infiltrated Electrodes}, journal = {ECS Transactions}, volume = {91}, year = {2019}, month = {07/2019}, pages = {877{\textendash}885}, abstract = {The LBNL metal-supported solid oxide cell architecture contains zirconia electrolyte and porous backbones co-sintered between porous stainless steel supports. Advantages of this design include low-cost structural materials, mechanical ruggedness, excellent tolerance to redox cycling, and extremely fast start-up capability. With infiltrated catalysts, high performance is also achieved: 1.5 W/cm2 with hydrogen fuel and 1.3 W/cm2 with internal reforming of ethanol fuel at 700 {\textdegree}C; 2.6 A/cm2 electrolysis current density at 1.3V and 50\% steam/50\% hydrogen at 700{\textdegree}C. Recent approaches to mitigating catalyst coarsening and Cr deposition within the cathode stabilize the microstructure during operation. The degradation rate is improved to 2.3\% kh-1 at 700{\textdegree}C in fuel cell mode. Electrolysis operation, however, results in higher degradation rate. Preliminary effort to fabricate metal-supported cells with proton conducting electrolyte is successful for La0.99Ca0.01NbO4 electrolyte, and specific challenges for BaZr0.7Ce0.2Y0.1O3-δ electrolyte are determined.}, keywords = {BaZr0.7Ce0.2Y0.1O3-δ electrolyte, HTE, La0.99Ca0.01NbO4 electrolyte, SOEC}, doi = {10.1149/09101.0877ecst}, url = {https://doi.org/10.1149/09101.0877ecst}, author = {Emir Dogdibegovic and Fengyu Shen and Ruofan Wang and Ian Robinson and Grace Y Lau and Michael C Tucker} } @article {1093, title = {A Single-Junction Cathodic Approach for Stable Unassisted Solar Water Splitting}, journal = {Joule}, year = {2019}, abstract = {

Published in August 2019.

}, issn = {25424351}, doi = {10.1016/j.joule.2019.07.022}, url = {https://linkinghub.elsevier.com/retrieve/pii/S2542435119303666}, author = {Yongjie Wang and Yuanpeng Wu and Jonathan Schwartz and Suk Hyun Sung and Robert Hovden and Zetian Mi} } @article {1192, title = {Stable Unassisted Solar Water Splitting on Semiconductor Photocathodes Protected by Multifunctional GaN Nanostructures}, journal = {ACS Energy Letters}, volume = {4}, year = {2019}, pages = {1541-1548}, keywords = {durability, GaAs, GaInP2, GaN nanowires, Ge, III-V, PEC, Photocathode, Unbiased water splitting}, doi = {10.1021/acsenergylett.9b00549}, url = {https://doi.org/10.1021/acsenergylett.9b00549}, author = {Wang, Yongjie and Schwartz, Jonathan and Gim, Jiseok and Hovden, Robert and Mi, Zetian} } @article {1070, title = {Synthesis of Aromatic Anion Exchange Membranes by Friedel{\textendash}Crafts Bromoalkylation and Cross-Linking of Polystyrene Block Copolymers}, journal = {Macromolecules}, volume = {52}, year = {2019}, pages = {2139-2147}, abstract = {

Published on March 12th, 2019. Elastomeric anion exchange membranes (AEMs) were prepared by acid-catalyzed Friedel{\textendash}Crafts alkylation of the polystyrene block of polystyrene-b-poly(ethylene-co-butylene)-b-polystyrene (SEBS) using bromoalkylated tertiary alcohols and triflic acid as a catalyst, followed by amination with trimethylamine. This simple one-step bromoalkylation allowed convenient control of both the degree of functionalization and cation tether length by changing the molar ratio and the structure of the bromoalkylated tertiary alcohol. The resulting quaternary ammonium-functionalized ionic triblock SEBS copolymers showed a microphase-separated morphology on the 35 nm length scale. A series of AEMs with different ion exchange capacities and ion tether lengths were systematically investigated by comparing swelling and anion conductivity. Because the SEBS AEMs showed high swelling and low dimensional stability in water due to the rubbery nature of SEBS, the hard segment PS units were cross-linked by 1,6-hexanediamine for practical use. The cross-linking of SEBS AEMs reduced water uptake significantly (e.g., 155\% vs 28\%) and enhanced their mechanical properties. Because the backbone of the SEBS AEMs are composed of all carbon{\textendash}carbon bonds, they showed good alkaline stability, preserving their IEC and OH{\textendash} conductivity after testing in a 1 M NaOH solution at 80 {\textdegree}C for 500 h. Alkaline membrane fuel cell performance was evaluated with the cross-linked SEBS AEM, and a peak power density of 520 mW/cm2 was achieved at 60 {\textdegree}C under H2/O2 conditions.

}, issn = {0024-9297}, doi = {10.1021/acs.macromol.8b02355}, url = {https://doi.org/10.1021/acs.macromol.8b02355}, author = {Yong Yeob Jeon and Sungmin Park and Junyoung Han and Sandip Maurya and Angela D. Mohanty and Ding Tian and Nayan Saikia and Michael A. Hickner and Chang Y. Ryu and Mark E. Tuckerman and Stephen J. Paddison and Yu Seung Kim and Chulsung Bae} } @article {1194, title = {Transition Metal Arsenide Catalysts for the Hydrogen Evolution Reaction}, journal = {The Journal of Physical Chemistry C}, volume = {123}, year = {2019}, pages = {24007-24012}, keywords = {Arsenide catalyst, CoAs, Hydrogen evolution catalyst, MoAs, Modeling, PEC}, doi = {10.1021/acs.jpcc.9b05738}, url = {https://doi.org/10.1021/acs.jpcc.9b05738}, author = {Gauthier, Joseph A. and King, Laurie A. and Stults, Faith Tucker and Flores, Raul A. and Kibsgaard, Jakob and Regmi, Yagya N. and Chan, Karen and Jaramillo, Thomas F.} } @article {785, title = {BaCe 0.25 Mn 0.75 O 3-δ {\textemdash}a promising perovskite-type oxide for solar thermochemical hydrogen production}, journal = {Energy \& Environmental Science}, year = {2018}, note = {

{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n\ \n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright}

}, issn = {1754-5692, 1754-5706}, doi = {10.1039/C8EE01989D}, url = {http://xlink.rsc.org/?DOI=C8EE01989D}, author = {Debora R. Barcellos and Michael D. Sanders and Jianhua Tong and Anthony H. McDaniel and Ryan P. O{\textquoteright}Hayre} } @article {776, title = {Cosputtered Calcium Manganese Oxide Electrodes for Water Oxidation}, journal = {Inorganic Chemistry}, volume = {57}, year = {2018}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {785-792}, abstract = {Published on January 16th, 2018.}, issn = {0020-1669, 1520-510X}, doi = {10.1021/acs.inorgchem.7b02717}, url = {http://pubs.acs.org/doi/10.1021/acs.inorgchem.7b02717}, author = {Hamed Simchi and Kayla A. Cooley and Jonas Ohms and Lingqin Huang and Philipp Kurz and Suzanne E. Mohney} } @article {1085, title = {Gallium nitride nanowire as a linker of molybdenum sulfides and silicon for photoelectrocatalytic water splitting}, journal = {Nature Communications}, volume = {9}, year = {2018}, month = {09/2018}, pages = {3856}, abstract = {

Published on September 21st, 2018. Sunlight-harvesting materials require the clean integration of light-absorbing and catalytic components to be efficient. Here, authors link silicon photoelectrodes and molybdenum sulfide catalysts with defect-free gallium nitride nanowire to improve photoelectrochemical hydrogen evolution.

}, issn = {2041-1723}, doi = {10.1038/s41467-018-06140-1}, url = {https://www.nature.com/articles/s41467-018-06140-1}, author = {Baowen Zhou and Xianghua Kong and Srinivas Vanka and Sheng Chu and Pegah Ghamari and Yichen Wang and Nick Pant and Ishiang Shih and Hong Guo and Zetian Mi} } @article {1086, title = {High Efficiency Si Photocathode Protected by Multifunctional GaN Nanostructures}, journal = {Nano Letters}, volume = {18}, year = {2018}, pages = {6530-6537}, abstract = {

Published on October 10th, 2018. Photoelectrochemical water splitting is a clean and environmentally friendly method for solar hydrogen generation. Its practical application, however, has been limited by the poor stability of semiconductor photoelectrodes. In this work, we demonstrate the use of GaN nanostructures as a multifunctional protection layer for an otherwise unstable, low-performance photocathode. The direct integration of GaN nanostructures on n+{\textendash}p Si wafer not only protects Si surface from corrosion but also significantly reduces the charge carrier transfer resistance at the semiconductor/liquid junction, leading to long-term stability (\>100 h) at a large current density (\>35 mA/cm2) under 1 sun illumination. The measured applied bias photon-to-current efficiency of 10.5\% is among the highest values ever reported for a Si photocathode. Given that both Si and GaN are already widely produced in industry, our studies offer a viable path for achieving high-efficiency and highly stable semiconductor photoelectrodes for solar water splitting with proven manufacturability and scalability.

}, issn = {1530-6984}, doi = {10.1021/acs.nanolett.8b03087}, url = {https://doi.org/10.1021/acs.nanolett.8b03087}, author = {Srinivas Vanka and Elisabetta Arca and Shaobo Cheng and Kai Sun and Gianluigi A. Botton and Glenn Teeter and Zetian Mi} } @article {1069, title = {Performance enhancement of PEM electrolyzers through iridium-coated titanium porous transport layers}, journal = {Electrochemistry Communications}, volume = {97}, year = {2018}, month = {12/2018}, pages = {96-99}, abstract = {

Published on December 1st, 2018. Titanium-based porous transport layers (PTL) used in polymer electrolyte membrane (PEM) water electrolyzers suffer from surface passivation (titanium oxidation), which increases the interface resistance between the PTL and electrode. For long-term operation, PTLs are typically coated with considerable amounts of platinum or gold to ensure reasonable performance profiles over time. Moreover, it is well known that the oxide forms of platinum and gold are not stable under electrolysis conditions. In this study, an easy and scalable method is introduced to protect the titanium PTL from passivation by sputtering very thin layers of iridium onto commercially-available titanium PTLs. The iridium layer reduces the overall ohmic resistance of the PTL/catalyst layer interface and improves the cell{\textquoteright}s performance to that achieved with carbon-based PTLs. The coating process homogeneously deposited iridium throughout the inner structure of the PTL. The findings of this study may lead to the use of iridium as a protective layer for titanium PTLs, potentially enable operation at increased cell voltages and lead to increased electrolyzer durability.

}, issn = {1388-2481}, doi = {10.1016/j.elecom.2018.10.021}, url = {http://www.sciencedirect.com/science/article/pii/S1388248118302741}, author = {Chang Liu and Marcelo Carmo and Guido Bender and Andreas Everwand and Thomas Lickert and James L. Young and Tom Smolinka and Detlef Stolten and Werner Lehnert} } @article {1076, title = {Physical descriptor for the Gibbs energy of inorganic crystalline solids and temperature-dependent materials chemistry}, journal = {Nature Communications}, volume = {9}, year = {2018}, month = {10/2018}, pages = {4168}, issn = {2041-1723}, doi = {10.1038/s41467-018-06682-4}, url = {https://www.nature.com/articles/s41467-018-06682-4}, author = {Christopher J. Bartel and Samantha L. Millican and Ann M. Deml and John R. Rumptz and William Tumas and Alan W. Weimer and Stephan Lany and Vladan Stevanovi{\'c} and Charles B. Musgrave and Aaron M. Holder} } @article {1077, title = {Solar Thermochemical Hydrogen (STCH) Processes}, journal = {The Electrochemical Society Interface}, volume = {27}, year = {2018}, pages = {53-56}, issn = {1064-8208, 1944-8783}, doi = {10.1149/2.F05181if}, url = {http://interface.ecsdl.org/lookup/doi/10.1149/2.F05181if}, author = {Maximilian B. Gorensek and Claudio Corgnale and John A. Staser and John W. Weidner} } @article {1042, title = {Solar Water Oxidation by an InGaN Nanowire Photoanode with a Bandgap of 1.7 eV}, journal = {ACS Energy Letters}, volume = {3}, year = {2018}, note = {

{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n\ \n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright}

}, pages = {307-314}, abstract = {

Published on February 9th, 2018. The performance of overall solar water splitting has been largely limited by the half-reaction of water oxidation. Here, we report a 1.7 eV bandgap InGaN nanowire photoanode for efficient solar water oxidation. It produces a low onset potential of 0.1 V versus a reversible hydrogen electrode (RHE) and a high photocurrent density of 5.2 mA/cm2 at a potential as low as 0.6 V versus RHE. The photoanode yields a half-cell solar energy conversion efficiency up to 3.6\%, a record for a single-photon photoanode to our knowledge. Furthermore, in the presence of hole scavengers, the photocurrent density of the InGaN photoanode reaches 21.2 mA/cm2 at 1.23 V versus RHE, which approaches the theoretical limit for a 1.7 eV InGaN absorber. The InGaN nanowire photoanode may serve as an ideal top cell in a photoelectrochemical tandem device when stacked with a 0.9{\textendash}1.2 eV bandgap bottom cell, which can potentially deliver solar-to-hydrogen efficiency over 25\%.

}, doi = {10.1021/acsenergylett.7b01138}, url = {https://doi.org/10.1021/acsenergylett.7b01138}, author = {Sheng Chu and Srinivas Vanka and Yichen Wang and Jiseok Gim and Yongjie Wang and Yong-Ho Ra and Robert Hovden and Hong Guo and Ishiang Shih and Zetian Mi} } @article {1008, title = {Anodic Behavior of the Aluminum Current Collector in Imide-Based Electrolytes: Influence of Solvent, Operating Temperature, and Native Oxide-Layer Thickness}, journal = {ChemSusChem}, volume = {10}, year = {2017}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {804-814}, abstract = {Published on February 22nd, 2017. The inability of imide salts to form a sufficiently effective passivation layer on aluminum current collectors is one of the main obstacles that limit their broad application in electrochemical energy-storage systems. However, under certain circumstances, the use of electrolytes with imide electrolyte salts in combination with the aluminum current collector is possible. In this contribution, the stability of the aluminum current collector in electrolytes containing either lithium bis(trifluoromethanesulfonyl) imide (LiTFSI) or lithium fluorosulfonyl-(trifluoromethanesulfonyl) imide (LiFTFSI) as conductive salt was investigated by electrochemical techniques, that is, cyclic voltammetry (CV) and chronocoulometry (CC) in either room-temperature ionic liquids or in ethyl methyl sulfone. In particular, the influence of the solvent, operating temperature, and thickness of the native oxide layer of aluminum on the pit formation at the aluminum current collector surface was studied by means of scanning electron microscopy. In general, a more pronounced aluminum dissolution and pit formation was found at elevated temperatures as well as in solvents with a high dielectric constant. An enhanced thickness of the native aluminum oxide layer increases the oxidative stability versus dissolution. Furthermore, we found a different reaction rate depending on dwell time at the upper cut-off potential for aluminum dissolution in TFSI- and FTFSI-based electrolytes during the CC measurements; the use of LiFTFSI facilitated the dissolution of aluminum compared to LiTFSI. Overall, the mechanism of anodic aluminum dissolution is based on: i) the attack of the Al2O3 surface by acidic species and ii) the dissolution of bare aluminum into the electrolyte, which, in turn, is influenced by the electrolyte{\textquoteright}s dielectric constant.}, issn = {1864-564X}, doi = {10.1002/cssc.201601636}, url = {http://onlinelibrary.wiley.com/doi/10.1002/cssc.201601636/abstract}, author = {Paul Meister and Xin Qi and Richard Kloepsch and Elisabeth Kr{\"a}mer and Benjamin Streipert and Martin Winter and Tobias Placke} } @article {871, title = {Applications and limitations of two step metal oxide thermochemical redox cycles; a review}, journal = {J. Mater. Chem. A}, volume = {5}, year = {2017}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {18951-18966}, issn = {2050-7488, 2050-7496}, doi = {10.1039/C7TA05025A}, url = {http://xlink.rsc.org/?DOI=C7TA05025A}, author = {B. Bulfin and J. Vieten and C. Agrafiotis and M. Roeb and C. Sattler} } @article {1028, title = {Critical Review{\textemdash}Identifying Critical Gaps for Polymer Electrolyte Water Electrolysis Development}, journal = {Journal of The Electrochemical Society}, volume = {164}, year = {2017}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {F387-F399}, abstract = {Published on January 1st, 2017. Although polymer electrolyte water electrolyzers (PEWEs) have been used in small-scale (kW to tens of kW range) applications for several decades, PEWE technology for hydrogen production in energy applications (power-to-gas, power-to-fuel, etc.) requires significant improvements in the technology to address the challenges associated with cost, performance and durability. Systems with power of hundreds of kW or even MWs, corresponding to hydrogen production rates of around 10 to 20 kg/h, have started to appear in the past 5 years. The thin (\~{}0.2 mm) polymer electrolyte in the PEWE with low ohmic resistance, compared to the alkaline cell with liquid electrolyte, allows operation at high current densities of 1{\textendash}3 A/cm2 and high differential pressure. This article, after an introductory overview of the operating principles of PEWE and state-of-the-art, discusses the state of understanding of key phenomena determining and limiting performance, durability, and commercial readiness, identifies important {\textquoteleft}gaps{\textquoteright} in understanding and essential development needs to bring PEWE science \& engineering forward to prosper in the energy market as one of its future backbone technologies. For this to be successful, science, engineering, and process development as well as business and market development need to go hand in hand.}, issn = {0013-4651, 1945-7111}, doi = {10.1149/2.1441704jes}, url = {http://jes.ecsdl.org/content/164/4/F387}, author = {Ugljesa Babic and Michel Suermann and Felix N. B{\"u}chi and Lorenz Gubler and Thomas J. Schmidt} } @article {1030, title = {A Decade of Solid Oxide Electrolysis Improvements at DTU Energy}, journal = {ECS Transactions}, volume = {75}, year = {2017}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {3-14}, abstract = {Published on January 11th, 2017. Solid oxide electrolysis cells (SOECs) can efficiently convert electrical energy (e.g. surplus wind power) to energy stored in fuels such as hydrogen or other synthetic fuels. Performance and durability of the SOEC has increased orders of magnitudes within the last decade. This paper presents a short review of the R\&D work on SOEC single cells conducted at DTU Energy from 2005 to 2015. The SOEC improvements have involved increasing the of the oxygen electrode performance, elimination of impurities in the feed streams, optimization of processing routes, and fuel electrode structure optimization. All together, these improvements have led to a decrease in long-term degradation rate from ~40 \%/kh to ~0.4 \%/kh for steam electrolysis at -1 A/cm2, while the initial area specific resistance has been decreased from 0.44 Wcm2 to 0.15 Wcm2 at -0.5 A/cm2 and 750 {\textdegree}C.}, issn = {1938-6737, 1938-5862}, doi = {10.1149/07542.0003ecst}, url = {http://ecst.ecsdl.org/content/75/42/3}, author = {Anne Hauch and Karen Brodersen and Ming Chen and Christopher Graves and S{\o}ren H{\o}jgaard Jensen and Peter Stanley J{\o}rgensen and Peter Vang Hendriksen and Mogens Bjerg Mogensen and Simona Ovtar and Xiufu Sun} } @article {822, title = {A piezomicrobalance system for high-temperature mass relaxation characterization of metal oxides: A case study of Pr-doped ceria}, journal = {Journal of the American Ceramic Society}, volume = {100}, year = {2017}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {1161-1171}, abstract = {Published in March 2017.}, issn = {00027820}, doi = {10.1111/jace.14652}, url = {http://doi.wiley.com/10.1111/jace.14652}, author = {Philipp Simons and Ho-Il Ji and Timothy C. Davenport and Sossina M. Haile} } @article {759, title = {Point defects in Cu2ZnSnSe4 (CZTSe): Resonant X-ray diffraction study of the low-temperature order/disorder transition}, journal = {physica status solidi (b)}, volume = {254}, year = {2017}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {1700156}, abstract = {The interest in Cu2ZnSn(S,Se)4 (CZTS) for photovoltaic applications is motivated by similarities to Cu(In,Ga)Se2 while being comprised of non-toxic and earth abundant elements. However, CZTS suffers from a Voc deficit, where the Voc is much lower than expected based on the band gap, which may be the result of a high concentration of point-defects in the CZTS lattice. Recently, reports have observed a low-temperature order/disorder transition by Raman and optical spectroscopies in CZTS films and is reported to describe the ordering of Cu and Zn atoms in the CZTS crystal structure. To directly determine the level of Cu/Zn ordering, we have used resonant-XRD, a site, and element specific probe of long range order. We used CZTSe films annealed just below and quenched from just above the transition temperature; based on previous work, the Cu and Zn should be ordered and highly disordered, respectively. Our data show that there is some Cu/Zn ordering near the low temperature transition but significantly less than high chemical order expected from Raman. To understand both our resonant-XRD results and the Raman results, we present a structural model that involves antiphase domain boundaries and accommodates the excess Zn within the CZTS lattice.}, issn = {1521-3951}, doi = {10.1002/pssb.201700156}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/pssb.201700156}, author = {L. T. Schelhas and K. H. Stone and S. P. Harvey and D. Zakhidov and A. Salleo and G. Teeter and I. L. Repins and M. F. Toney} } @article {978, title = {Solar photochemical{\textendash}thermal water splitting at 140 {\textdegree}C with Cu-loaded TiO 2}, journal = {Energy \& Environmental Science}, volume = {10}, year = {2017}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {628-640}, issn = {1754-5692, 1754-5706}, doi = {10.1039/C6EE02974D}, url = {http://xlink.rsc.org/?DOI=C6EE02974D}, author = {Son Docao and Agni Raj Koirala and Min Gyu Kim and In Chul Hwang and Mee Kyung Song and Kyung Byung Yoon} } @article {981, title = {Solar thermochemical splitting of CO 2 into separate streams of CO and O 2 with high selectivity, stability, conversion, and efficiency}, journal = {Energy \& Environmental Science}, volume = {10}, year = {2017}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {1142-1149}, issn = {1754-5692, 1754-5706}, doi = {10.1039/C6EE03776C}, url = {http://xlink.rsc.org/?DOI=C6EE03776C}, author = {Daniel Marxer and Philipp Furler and Michael Takacs and Aldo Steinfeld} } @article {983, title = {Thermochemical CO 2 splitting using double perovskite-type Ba 2 Ca 0.66 Nb 1.34-x Fe x O 6-δ}, journal = {Journal of Materials Chemistry A}, volume = {5}, year = {2017}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {6874-6883}, issn = {2050-7488, 2050-7496}, doi = {10.1039/C6TA10285A}, url = {http://xlink.rsc.org/?DOI=C6TA10285A}, author = {Suresh Mulmi and Haomin Chen and Azfar Hassan and Jose F. Marco and Frank J. Berry and Farbod Sharif and Peter R. Slater and Edward P. L. Roberts and Stefan Adams and Venkataraman Thangadurai} } @article {979, title = {Thermodynamics of paired charge-compensating doped ceria with superior redox performance for solar thermochemical splitting of H 2 O and CO 2}, journal = {Journal of Materials Chemistry A}, volume = {5}, year = {2017}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {19476-19484}, issn = {2050-7488, 2050-7496}, doi = {10.1039/C7TA05824A}, url = {http://xlink.rsc.org/?DOI=C7TA05824A}, author = {Marie Hoes and Christopher L. Muhich and Roger Jacot and Greta R. Patzke and Aldo Steinfeld} } @article {991, title = {Acidic or Alkaline? Towards a New Perspective on the Efficiency of Water Electrolysis}, journal = {Journal of The Electrochemical Society}, volume = {163}, year = {2016}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {F3197-F3208}, abstract = {Published on January 1st, 2016. Water electrolysis is a promising technology for enabling the storage of surplus electricity produced by intermittent renewable power sources in the form of hydrogen. At the core of this technology is the electrolyte, and whether this is acidic or alkaline affects the reaction mechanisms, gas purities and is of significant importance for the stability and activity of the electrocatalysts. This article presents a simple but precise physical model to describe the voltage-current characteristic, heat balance, gas crossover and cell efficiency of water electrolyzers. State-of-the-art water electrolysis cells with acidic and alkaline electrolyte are experimentally characterized in order to parameterize the model. A rigorous comparison shows that alkaline water electrolyzers with Ni-based catalysts but thinner separators than those typically used is expected be more efficient than acidic water electrolysis with Ir and Pt based catalysts. This performance difference was attributed mainly to a similar conductivity but approximately 38-fold higher diffusivities of hydrogen and oxygen in the acidic polymer electrolyte membrane (Nafion) than those in the alkaline separator (Zirfon filled with a 30 wt} KOH solution). With reference to the detailed analysis of the cell characteristics, perspectives for the improvement of the efficiency of water electrolyzers are discussed.}, issn = {0013-4651, 1945-7111}, doi = {10.1149/2.0271611jes}, url = {http://jes.ecsdl.org/content/163/11/F3197}, author = {Maximilian Schalenbach and Geert Tjarks and Marcelo Carmo and Wiebke Lueke and Martin Mueller and Detlef Stolten} } @article {1011, title = {An analysis of degradation phenomena in polymer electrolyte membrane water electrolysis}, journal = {Journal of Power Sources}, volume = {326}, year = {2016}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {120-128}, abstract = {Published on September 15th, 2016. The durability of a polymer electrolyte membrane (PEM) water electrolysis single cell, assembled with regular porous transport layers (PTLs) is investigated for just over 1000~h. We observe a significant degradation rate of 194~μV~h-1 and conclude that 78\% of the detectable degradation can be explained by an increase in ohmic resistance, arising from the anodic Ti-PTL. Analysis of the polarization curves also indicates a decrease in the anodic exchange current density, j0, that results from the over-time contamination of the anode with Ti species. Furthermore, the average Pt-cathode particle size increases during the test, but we do not believe this phenomenon makes a significant contribution to increased cell voltages. To validate the anode Ti-PTL as a crucial source of increasing resistance, a second cell is assembled using Pt-coated Ti-PTLs. This yields a substantially reduced degradation rate of only 12~μV~h-1, indicating that a non-corroding anode PTL is vital for PEM electrolyzers. It is our hope that forthcoming tailored PTLs will not only contribute to fast progress on cost-efficient stacks, but also to its long-term application of PEM electrolyzers involved in industrial processes.}, issn = {0378-7753}, doi = {10.1016/j.jpowsour.2016.06.082}, url = {http://www.sciencedirect.com/science/article/pii/S0378775316307844}, author = {Christoph Rakousky and Uwe Reimer and Klaus Wippermann and Marcelo Carmo and Wiebke Lueke and Detlef Stolten} } @inbook {749, title = {Application of SR methods for the study of nanocomposite materials for Hydrogen Energy}, volume = {84}, year = {2016}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {397-406}, publisher = {Elsevier Science Bv}, organization = {Elsevier Science Bv}, address = {Amsterdam}, abstract = {This work summarizes results of synchrotron radiation (SR) studies of the real/defect structure of nanocrystalline/nanocomposite oxide materials, which determines their functional properties in hydrogen energy field as catalysts and mixed ionic electronic conductors (cathodes and anodes of solid oxide fuel cells, oxygen separation membranes). For nanocrystalline ceria-zirconia mixed oxide prepared via modified Pechini route using ethanol solution of reagents, a high spatial uniformity of cations distribution between domains along with the oxygen sublattice deficiency revealed by full-profile Rietveld refinement of SR diffraction data provide structure disordering enhancing oxygen mobility. For PrNi0.5Co0.5O3-delta - Ce0.9Y0.1O2-delta nanocomposite extensive transfer of Pr cations into fluorite domains generates a new path of fast oxygen diffusion along chains of Pr3+ - Pr4+ cations as directly proved by analysis of the unit cell relaxation after changing pO(2) in perfect agreement with data obtained by oxygen isotope heteroexchange. (C) 2016 The Authors. Published by Elsevier B.V.}, author = {V. A. Sadykov and S. N. Pavlova and Z. S. Vinokurov and A. N. Shmakov and N. F. Eremeev and Yu E. Fedorova and E. P. Yakimchuk and V. V. Kriventsov and V. A. Bolotov and Yu Yu Tanashev and E. M. Sadovskaya and S. V. Cherepanova and K. V. Zolotarev and N. A. Vinokurov and B. A. Knyazev} } @article {865, title = {Critical limitations on the efficiency of two-step thermochemical cycles}, journal = {Solar Energy}, volume = {123}, year = {2016}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {57-73}, abstract = {Published in January 2016. *The authors bring to attention the need for standardizing methods to evaluate material performance, and propose a modeling framework from which to accomplish this.}, issn = {0038092X}, doi = {10.1016/j.solener.2015.09.036}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0038092X15005228}, author = {Colby Jarrett and William Chueh and Cansheng Yuan and Yoshiaki Kawajiri and Kenneth H. Sandhage and Asegun Henry} } @conference {862, title = {Design and construction of a cascading pressure reactor prototype for solar-thermochemical hydrogen production}, volume = {1734}, year = {2016}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {120001}, address = {Cape Town, South Africa}, doi = {10.1063/1.4949203}, url = {http://scitation.aip.org/content/aip/proceeding/aipcp/10.1063/1.4949203}, author = {Ivan Ermanoski and Johannes Grobbel and Abhishek Singh and Justin Lapp and Stefan Brendelberger and Martin Roeb and Christian Sattler and Josh Whaley and Anthony McDaniel and Nathan P. Siegel} } @article {869, title = {Effect of Flow Rates on Operation of a Solar Thermochemical Reactor for Splitting CO2 Via the Isothermal Ceria Redox Cycle}, journal = {Journal of Solar Energy Engineering}, volume = {138}, year = {2016}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {011007}, url = {https://solarenergyengineering.asmedigitalcollection.asme.org/article.aspx?articleid=2480938}, author = {Brandon J. Hathaway and Rohini Bala Chandran and Stephen Sedler and Daniel Thomas and Adam Gladen and Thomas Chase and Jane H. Davidson} } @article {1013, title = {Characterization of PEM fuel cell degradation by polarization change curves}, journal = {Journal of Power Sources}, volume = {294}, year = {2015}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {82-87}, abstract = {Published on October 30th, 2015. Polarization change curves, defined as a difference between the polarization curve at the beginning of life and the actual polarization curve after the cell has been operational for some time, were used to analyze degradation of a PEM fuel cell exposed to voltage cycling as an accelerated stress test for electrocatalyst degradation. Degradation, i.e., loss of voltage was due to increase of activation losses and increase of resistance in the catalyst layer, both most likely due to the loss of catalyst electrochemically active area. The results of the polarization change curves analysis correspond to the findings of the periodic individual tests performed during the accelerated stress test, such as electrochemical impedance spectroscopy, cyclic voltammetry and linear sweep voltammetry. Therefore, this method has potential to be used as a relatively quick and simple, yet effective, degradation diagnostic tool.}, issn = {0378-7753}, doi = {10.1016/j.jpowsour.2015.06.047}, url = {http://www.sciencedirect.com/science/article/pii/S0378775315010812}, author = {Dario Bezmalinovic and Boris Simic and Frano Barbir} } @article {806, title = {Concept analysis of an indirect particle-based redox process for solar-driven H2O/CO2 splitting}, journal = {Solar Energy}, volume = {113}, year = {2015}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {158-170}, abstract = {Published in March 2015.}, issn = {0038092X}, doi = {10.1016/j.solener.2014.12.035}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0038092X14006264}, author = {Stefan Brendelberger and Christian Sattler} } @article {951, title = {Design of a Solar Reactor to Split CO2 Via Isothermal Redox Cycling of Ceria}, journal = {Journal of Solar Energy Engineering}, volume = {137}, year = {2015}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {031007}, url = {https://solarenergyengineering.asmedigitalcollection.asme.org/article.aspx?articleID=1920469}, author = {Roman Bader and Rohini Bala Chandran and Luke J. Venstrom and Stephen J. Sedler and Peter T. Krenzke and Robert M. De Smith and Aayan Banerjee and Thomas R. Chase and Jane H. Davidson and Wojciech Lipi{\'L} and } } @article {957, title = {Oxygen nonstoichiometry and thermodynamic characterization of Zr doped ceria in the 1573{\textendash}1773 K temperature range}, journal = {Phys. Chem. Chem. Phys.}, volume = {17}, year = {2015}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {7813-7822}, issn = {1463-9076, 1463-9084}, doi = {10.1039/C4CP04916K}, url = {http://xlink.rsc.org/?DOI=C4CP04916K}, author = {M. Takacs and J. R. Scheffe and A. Steinfeld} } @article {946, title = {Perovskite La0.6Sr0.4Cr1-xCoxO3-δ solid solutions for solar-thermochemical fuel production: strategies to lower the operation temperature}, journal = {J. Mater. Chem. A}, volume = {3}, year = {2015}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {15546-15557}, issn = {2050-7488, 2050-7496}, doi = {10.1039/C5TA02519B}, url = {http://xlink.rsc.org/?DOI=C5TA02519B}, author = {A. H. Bork and M. Kubicek and M. Struzik and J. L. M. Rupp} } @article {820, title = {A review on solar thermal syngas production via redox pair-based water/carbon dioxide splitting thermochemical cycles}, journal = {Renewable and Sustainable Energy Reviews}, volume = {42}, year = {2015}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {254-285}, abstract = {Published in February 2015.}, issn = {13640321}, doi = {10.1016/j.rser.2014.09.039}, url = {http://linkinghub.elsevier.com/retrieve/pii/S1364032114008120}, author = {Christos Agrafiotis and Martin Roeb and Christian Sattler} } @article {860, title = {Surface controlled reduction kinetics of nominally undoped polycrystalline CeO 2}, journal = {Phys. Chem. Chem. Phys.}, volume = {17}, year = {2015}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {5849-5860}, issn = {1463-9076, 1463-9084}, doi = {10.1039/C4CP05742B}, url = {http://xlink.rsc.org/?DOI=C4CP05742B}, author = {Nicole Knoblauch and Lars D{\"o}rrer and Peter Fielitz and Martin Schm{\"u}cker and G{\"u}nter Borchardt} } @article {928, title = {Annual Average Efficiency of a Solar-thermochemical Reactor}, journal = {Energy Procedia}, volume = {49}, year = {2014}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {1932-1939}, issn = {18766102}, doi = {10.1016/j.egypro.2014.03.205}, url = {http://linkinghub.elsevier.com/retrieve/pii/S1876610214006596}, author = {I. Ermanoski and N. Siegel} } @article {846, title = {CeO2 modified Fe2O3 for the chemical hydrogen storage and production via cyclic water splitting}, journal = {International Journal of Hydrogen Energy}, volume = {39}, year = {2014}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {13381-13388}, abstract = {Published in August 2014.}, issn = {03603199}, doi = {10.1016/j.ijhydene.2014.04.136}, url = {http://linkinghub.elsevier.com/retrieve/pii/S036031991401194X}, author = {Xing Zhu and Lingyue Sun and Yane Zheng and Hua Wang and Yonggang Wei and Kongzhai Li} } @article {939, title = {Oxide enthalpy of formation and band gap energy as accurate descriptors of oxygen vacancy formation energetics}, journal = {Energy \& Environmental Science}, volume = {7}, year = {2014}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {1996}, issn = {1754-5692, 1754-5706}, doi = {10.1039/c3ee43874k}, url = {http://xlink.rsc.org/?DOI=c3ee43874k}, author = {Ann M. Deml and Vladan Stevanovi{\'c} and Christopher L. Muhich and Charles B. Musgrave and Ryan O{\textquoteright}Hayre} } @article {838, title = {Analysis and improvement of a high-efficiency solar cavity reactor design for a two-step thermochemical cycle for solar hydrogen production from water}, journal = {Solar Energy}, volume = {97}, year = {2013}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {26-38}, abstract = {Published in November 2013.}, issn = {0038092X}, doi = {10.1016/j.solener.2013.07.032}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0038092X13003071}, author = {Anis Houaijia and Christian Sattler and Martin Roeb and Matthias Lange and Stefan Breuer and Jan Peter S{\"a}ck} } @article {816, title = {Analytical Model of CeO 2 Oxidation and Reduction}, journal = {The Journal of Physical Chemistry C}, volume = {117}, year = {2013}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {24129-24137}, abstract = {Published on November 21st, 2013.}, issn = {1932-7447, 1932-7455}, doi = {10.1021/jp406578z}, url = {http://pubs.acs.org/doi/abs/10.1021/jp406578z}, author = {B. Bulfin and A. J. Lowe and K. A. Keogh and B. E. Murphy and O. L{\"u}bben and S. A. Krasnikov and I. V. Shvets} } @article {826, title = {A Beam-down Central Receiver for Solar Thermochemical Hydrogen Production}, number = {Proceedings of the American Solar Energy Society}, year = {2013}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, address = {Baltimore, MD USA}, abstract = {Published in April 2013}, url = {http://proceedings.ases.org/wp-content/uploads/2014/02/SOLAR2013_0034_final-paper.pdf}, author = {Nathan P. Siegel and Ivan Ermanoski} } @article {933, title = {Kinetics and mechanism of solar-thermochemical H2 production by oxidation of a cobalt ferrite{\textendash}zirconia composite}, journal = {Energy \& Environmental Science}, volume = {6}, year = {2013}, note = {

{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n\ \n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright}

}, pages = {963}, issn = {1754-5692, 1754-5706}, doi = {10.1039/c3ee23568h}, url = {http://xlink.rsc.org/?DOI=c3ee23568h}, author = {Jonathan R. Scheffe and Anthony H. McDaniel and Mark D. Allendorf and Alan W. Weimer} } @article {924, title = {A new reactor concept for efficient solar-thermochemical fuel production}, journal = {Journal of Solar Energy Engineering}, volume = {135}, year = {2013}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {031002}, issn = {01996231}, doi = {10.1115/1.4023356}, url = {http://link.aip.org/link/JSEEDO/v135/i3/p031002/s1\&Agg=doi}, author = {Ivan Ermanoski and Nathan P. Siegel and Ellen B. Stechel} } @article {837, title = {A review on development of industrial processes and emerging techniques for production of hydrogen from renewable and sustainable sources}, journal = {Renewable and Sustainable Energy Reviews}, volume = {23}, year = {2013}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {443-462}, abstract = {Published in July 2013.}, issn = {13640321}, doi = {10.1016/j.rser.2013.02.019}, url = {http://linkinghub.elsevier.com/retrieve/pii/S1364032113001214}, author = {Rashmi Chaubey and Satanand Sahu and Olusola O. James and Sudip Maity} } @article {913, title = {Concentrating solar thermal power and thermochemical fuels}, journal = {Energy \& Environmental Science}, volume = {5}, year = {2012}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {9234-9245}, issn = {1754-5692, 1754-5706}, doi = {10.1039/c2ee21275g}, url = {http://xlink.rsc.org/?DOI=c2ee21275g}, author = {Manuel Romero and Aldo Steinfeld} } @article {921, title = {The Effects of Morphology on the Oxidation of Ceria by Water and Carbon Dioxide}, journal = {Journal of Solar Energy Engineering}, volume = {134}, year = {2012}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {011005}, issn = {01996231}, doi = {10.1115/1.4005119}, url = {http://SolarEnergyEngineering.asmedigitalcollection.asme.org/article.aspx?articleid=1456274}, author = {Luke J. Venstrom and Nicholas Petkovich and Stephen Rudisill and Andreas Stein and Jane H. Davidson} } @article {899, title = {Fuel production from CO2 using solar-thermal energy: system level analysis}, journal = {Energy \& Environmental Science}, volume = {5}, year = {2012}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {8417}, issn = {1754-5692, 1754-5706}, doi = {10.1039/c2ee21798h}, url = {http://xlink.rsc.org/?DOI=c2ee21798h}, author = {Jiyong Kim and Terry A. Johnson and James E. Miller and Ellen B. Stechel and Christos T. Maravelias} } @article {919, title = {Reimagining liquid transportation fuels : Sunshine to Petrol.}, number = {SAND2012-0307}, year = {2012}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, url = {http://www.osti.gov/servlets/purl/1035344/}, author = {James Edward Miller and Mark D. Allendorf and Andrea Ambrosini and Ken Shuang Chen and Eric Nicholas Coker and Daniel E. Dedrick and Richard B., Jr. Diver and Roy E., Jr. Hogan and Ivan Ermanoski and Terry Alan Johnson and Gary L. Kellog and Anthony H. McDaniel and Nathan Phillip Siegel and Chad Lynn Staiger and Ellen Beth Stechel} } @article {910, title = {Syngas production by simultaneous splitting of H2O and CO2 via ceria redox reactions in a high-temperature solar reactor}, journal = {Energy \& Environmental Science}, volume = {5}, year = {2012}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {6098}, issn = {1754-5692, 1754-5706}, doi = {10.1039/c1ee02620h}, url = {http://xlink.rsc.org/?DOI=c1ee02620h}, author = {Philipp Furler and Jonathan R. Scheffe and Aldo Steinfeld} } @article {914, title = {Thermodynamic Analysis of Cerium-based Oxides for Solar Thermochemical Fuel Production}, journal = {Energy \& Fuels}, year = {2012}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, author = {J. R. Scheffe and A. Steinfeld} } @article {804, title = {Control of Heterogeneity in Nanostructured Ce1{\textendash}xZrxO2 Binary Oxides for Enhanced Thermal Stability and Water Splitting Activity}, journal = {The Journal of Physical Chemistry C}, volume = {115}, year = {2011}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {21022-21033}, abstract = {Published on November 3rd, 2011.}, issn = {1932-7447, 1932-7455}, doi = {10.1021/jp2071315}, url = {http://pubs.acs.org/doi/abs/10.1021/jp2071315}, author = {Nicholas D. Petkovich and Stephen G. Rudisill and Luke J. Venstrom and Daniel B. Boman and Jane H. Davidson and Andreas Stein} } @article {799, title = {Synthesis and characterization of oxide materials for thermochemical CO2 splitting using concentrated solar energy.}, year = {2011}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, author = {Andrea Ambrosini and Ellen B Stechel and Eric Nicholas Coker and James E Miller and James Anthony Ohlhausen and Mark A Rodriguez} } @article {907, title = {Technologies and trends in solar power and fuels}, journal = {Energy \& Environmental Science}, volume = {4}, year = {2011}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {2503}, issn = {1754-5692, 1754-5706}, doi = {10.1039/c1ee01128f}, url = {http://xlink.rsc.org/?DOI=c1ee01128f}, author = {Martin Roeb and Martina Neises and Nathalie Monnerie and Christian Sattler and Robert Pitz-Paal} } @article {813, title = {Ce0.67Cr0.33O2.11: A New Low-Temperature O2 Evolution Material and H2 Generation Catalyst by Thermochemical Splitting of Water}, journal = {Chemistry of Materials}, volume = {22}, year = {2010}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {762-768}, abstract = {Published on February 9th, 2010.}, issn = {0897-4756, 1520-5002}, doi = {10.1021/cm9013305}, url = {http://pubs.acs.org/doi/abs/10.1021/cm9013305}, author = {Preetam Singh and M. S. Hegde} } @article {902, title = {Kinetic Investigations of the Hydrogen Production Step of a Thermochemical Cycle Using Mixed Iron Oxides Coated on Ceramic Substrates}, journal = {International Journal of Energy Research}, volume = {34}, year = {2010}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {651-661}, issn = {0363907X, 1099114X}, doi = {10.1002/er.1565}, url = {http://doi.wiley.com/10.1002/er.1565}, author = {Martina Neises and Martin Roeb and Martin Schm{\"u}cker and Christian Sattler and Robert Pitz-Paal} } @article {819, title = {A Spinel Ferrite/Hercynite Water-Splitting Redox Cycle}, journal = {International Journal of Hydrogen Energy}, volume = {35}, year = {2010}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {3333-3340}, abstract = {Published in April 2010.}, issn = {03603199}, doi = {10.1016/j.ijhydene.2010.01.140}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0360319910002387}, author = {Jonathan R. Scheffe and Jianhua Li and Alan W. Weimer} } @inbook {800, title = {Synthesis and characterization of ferrite materials for thermochemical CO2 splitting using concentrated solar energy}, year = {2010}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {1{\textendash}13}, publisher = {American Chemical Society}, organization = {American Chemical Society}, author = {Andrea Ambrosini and Eric N Coker and Mark A Rodriguez and Stephanie Livers and Lindsey R Evans and James E Miller and Ellen B Stechel} } @article {883, title = {Summary Report: Direct Approaches for Recycling Carbon Dioxide into Synthetic Fuel}, number = {SAND2009-0399}, year = {2009}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, abstract = {The consumption of petroleum by the transportation sector in the United States is roughly equivalent to petroleum imports into the country, which have totaled over 12 million barrels a day every year since 2004. This reliance on foreign oil is a strategic vulnerability for the economy and national security. Further, the effect of unmitigated CO2 releases on the global climate is a growing concern both here and abroad. Independence from problematic oil producers can be achieved to a great degree through the utilization of non-conventional hydrocarbon resources such as coal, oil-shale and tarsands. However, tapping into and converting these resources into liquid fuels exacerbates green house gas (GHG) emissions as they are carbon rich, but hydrogen deficient. Revolutionary thinking about energy and fuels must be adopted. We must recognize that hydrocarbon fuels are ideal energy carriers, but not primary energy sources. The energy stored in a chemical fuel is released for utilization by oxidation. In the case of hydrogen fuel the chemical product is water; in the case of a hydrocarbon fuel, water and carbon dioxide are produced. The hydrogen economy envisions a cycle in which H2O is re-energized by splitting water into H2 and O2, by electrolysis for example. We envision a hydrocarbon analogy in which both carbon dioxide and water are re-energized through the application of a persistent energy source (e.g. solar or nuclear). This is of course essentially what the process of photosynthesis accomplishes, albeit with a relatively low sunlight-to-hydrocarbon efficiency. The goal of this project then was the creation of a direct and efficient process for the solar or nuclear driven thermochemical conversion of CO2 to CO (and O2), one of the basic building blocks of synthetic fuels. This process would potentially provide the basis for an alternate hydrocarbon economy that is carbon neutral, provides a pathway to energy independence, and is compatible with much of the existing fuel infrastructure.}, url = {http://www.osti.gov/scitech/servlets/purl/952162}, author = {James E. Miller and Lindsey R. Evans and Nathan P. Siegel and Richard B. Diver and Fred Gelbard and Andrea Ambrosini and Mark D. Allendorf} } @article {831, title = {Innovative Solar Thermochemical Water Splitting}, number = {SAND2008-0878}, year = {2008}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, url = {http://energiaypesca.net/biblioteca/Biblio_2/Diver\%20Sandia.pdf}, author = {Richard B. Diver and Nathan P. Siegel and Timothy A. Moss and James E. Miller and Lindsey Evans and Roy E. Hogan and Mark D. Allendorf and John N. Stuecker and Darryl L. James} } @article {891, title = {Solar thermochemical water-splitting ferrite-cycle heat engines}, journal = {Journal of Solar Energy Engineering}, volume = {130}, year = {2008}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {041001(1)-041001(8)}, issn = {01996231}, doi = {10.1115/1.2969781}, url = {http://link.aip.org/link/JSEEDO/v130/i4/p041001/s1\&Agg=doi}, author = {Richard B. Diver and James E. Miller and Mark D. Allendorf and Nathan P. Siegel and Roy E. Hogan} } @conference {878, title = {Materials Development for the CR5 Solar Thermochemical Heat Engine}, volume = {2006}, year = {2006}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {311-320}, publisher = {ASME}, organization = {ASME}, isbn = {0-7918-4745-4}, doi = {10.1115/ISEC2006-99152}, url = {http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1597678}, author = {James E. Miller and Lindsey R. Evans and John N. Stuecker and Mark D. Allendorf and Nathan P. Siegel and Richard B. Diver} } @conference {877, title = {Thermodynamic Analysis of Mixed-Metal Ferrites for Hydrogen Production by Two-Step Water Splitting}, volume = {2006}, year = {2006}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {285-290}, publisher = {ASME}, organization = {ASME}, isbn = {0-7918-4745-4}, doi = {10.1115/ISEC2006-99114}, url = {http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1597669}, author = {Mark D. Allendorf and Richard B. Diver and James E. Miller and Nathan P. Siegel} } @article {873, title = {Solar thermochemical process technology}, journal = {Encyclopedia of physical science and technology}, volume = {15}, year = {2001}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {237{\textendash}256}, url = {http://pre.ethz.ch/publications/0_pdf/books/Solar_Thermochemical_Process_Technology.pdf}, author = {A. Steinfeld and R. Palumbo} } @article {755, title = {The crystal structure of compositionally homogeneous mixed ceria-zirconia oxides by high resolution X-ray and neutron diffraction methods}, journal = {Open Chemistry}, volume = {15}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {438-445}, abstract = {The real/atomic structure of single phase homogeneous nanocrystalline Ce0.5Zr0.5O2 +/- delta oxides prepared by a modified Pechini route and Ni-loaded catalysts of methane dry reforming on their bases was studied by a combination of neutron diffraction, synchrotron X-ray diffraction, total X-ray scattering and X-ray absorption spectroscopy. The effects of sintering temperature and pretreatment in H-2 were elucidated. The structure of the mixed oxides corresponds to a tetragonal space group indicating a homogeneous distribution of Ce and Zr cations in the lattice. A pronounced disordering of the oxygen sublattice was revealed by neutron diffraction, supposedly due to incorporation of water into the structure when in contact with air promoted by the generation of anion vacancies in the lattice after reduction or calcination at high temperatures. However, such disordering has not resulted in any occupation of the oxygen interstitial positions in the bulk of the nanodomains.}, issn = {2391-5420}, doi = {10.1515/chem-2017-0044}, author = {Alexander N. Shmakov and Svetlana V. Cherepanova and Dmitrii A. Zyuzin and Yulia E. Fedorova and Ivan A. Bobrikov and Anne-Cecile Roger and Andrzej Adamski and Vladislav A. Sadykov} } @article {751, title = {Defect engineering by synchrotron radiation X-rays in CeO2 nanocrystals}, journal = {Journal of Synchrotron Radiation}, volume = {25}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {1395-1399}, abstract = {This work reports an unconventional defect engineering approach using synchrotron-radiation-based X-rays on ceria nanocrystal catalysts of particle sizes 4.4-10.6nm. The generation of a large number of oxygen-vacancy defects (OVDs), and therefore an effective reduction of cations, has been found in CeO2 catalytic materials bombarded by high-intensity synchrotron X-ray beams of beam size 1.5mmx0.5mm, photon energies of 5.5-7.8keV and photon fluxes up to 1.53x10(12) photons s(-1). The experimentally observed cation reduction was theoretically explained by a first-principles formation-energy calculation for oxygen vacancy defects. The results clearly indicate that OVD formation is mainly a result of X-ray-excited core holes that give rise to valence holes through electron down conversion in the material. Thermal annealing and subvalent Y-doping were also employed to modulate the efficiency of oxygen escape, providing extra control on the X-ray-induced OVD generating process. Both the core-hole-dominated bond breaking and oxygen escape mechanisms play pivotal roles for efficient OVD formation. This X-ray irradiation approach, as an alternative defect engineering method, can be applied to a wide variety of nanostructured materials for physical-property modification.}, issn = {1600-5775}, doi = {10.1107/S1600577518008184}, author = {Tai-Sing Wu and Leng-You Syu and Shih-Chang Weng and Horng-Tay Jeng and Shih-Lin Chang and Yun-Liang Soo} } @article {782, title = {Density Functional Theory Modeling of Low-Loss Electron Energy-Loss Spectroscopy in Wurtzite III-Nitride Ternary Alloys}, journal = {Microscopy and Microanalysis}, volume = {22}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {706-716}, issn = {1431-9276, 1435-8115}, doi = {10.1017/S1431927616000106}, url = {http://www.journals.cambridge.org/abstract_S1431927616000106}, author = {Alberto Eljarrat and Xavier Sastre and Francesca Peir{\'o} and S{\'o}nia Estrad{\'e}} } @article {789, title = {Density Functional Theory Modeling of MnO 2 Polymorphs as Cathodes for Multivalent Ion Batteries}, journal = {The Journal of Physical Chemistry C}, volume = {122}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {8788-8795}, issn = {1932-7447, 1932-7455}, doi = {10.1021/acs.jpcc.8b00918}, url = {http://pubs.acs.org/doi/10.1021/acs.jpcc.8b00918}, author = {Taylor R. Juran and Joshua Young and Manuel Smeu} } @article {975, title = {Design of a pilot scale directly irradiated, high temperature, and low pressure moving particle cavity chamber for metal oxide reduction}, journal = {Solar Energy}, volume = {157}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {365-376}, issn = {0038092X}, doi = {10.1016/j.solener.2017.08.040}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0038092X17307181}, author = {Abhishek Singh and Justin Lapp and Johannes Grobbel and Stefan Brendelberger and Jan P. Reinhold and Lamark Olivera and Ivan Ermanoski and Nathan P. Siegel and Anthony McDaniel and Martin Roeb and Christian Sattler} } @article {854, title = {Design principles for metal oxide redox materials for solar-driven isothermal fuel production}, journal = {Advanced Energy Materials}, volume = {5}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {1401082}, issn = {16146832}, doi = {10.1002/aenm.201401082}, url = {http://doi.wiley.com/10.1002/aenm.201401082}, author = {Ronald Michalsky and Venkatesh Botu and Cory M. Hargus and Andrew A. Peterson and Aldo Steinfeld} } @article {853, title = {Design principles of perovskites for thermochemical oxygen separation}, journal = {ChemSusChem}, volume = {8}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {1966-1971}, issn = {18645631}, doi = {10.1002/cssc.201500239}, url = {http://doi.wiley.com/10.1002/cssc.201500239}, author = {Miriam Ezbiri and Kyle M. Allen and Maria E. G{\`a}lvez and Ronald Michalsky and Aldo Steinfeld} } @article {762, title = {Determination of the Mechanism for Resonant Scattering in LaMnO 3}, journal = {Physical Review Letters}, volume = {96}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, issn = {0031-9007, 1079-7114}, doi = {10.1103/PhysRevLett.96.246405}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.96.246405}, author = {Q. Shen and I. S. Elfimov and P. Fanwick and Y. Tokura and T. Kimura and K. Finkelstein and R. Colella and G. A. Sawatzky} } @article {998, title = {Development and testing of a PEM SO2-depolarized electrolyzer and an operating method that prevents sulfur accumulation}, journal = {International Journal of Hydrogen Energy}, volume = {40}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {13281-13294}, abstract = {The hybrid sulfur (HyS) cycle is being developed as a technology to generate hydrogen by splitting water, using heat and electrical power from a nuclear or solar power plant. A key component is the SO2-depolarized electrolysis (SDE) cell, which reacts SO2 and water to form hydrogen and sulfuric acid. SDE could also be used in once-through operation to consume SO2 and generate hydrogen and sulfuric acid for sale. A proton exchange membrane (PEM) SDE cell based on a PEM fuel cell design was fabricated and tested. Measured cell potential as a function of anolyte pressure and flow rate, sulfuric acid concentration, and cell temperature are presented for this cell. Sulfur accumulation was observed inside the cell, which could have been a serious impediment to further development. A method to prevent sulfur formation was subsequently developed. This was made possible by a testing facility that allowed unattended operation for extended periods.}, issn = {0360-3199}, doi = {10.1016/j.ijhydene.2015.08.041}, url = {http://www.sciencedirect.com/science/article/pii/S0360319915021370}, author = {John L. Steimke and Timothy J. Steeper and H{\'e}ctor R. Col{\'o}n-Mercado and Maximilian B. Gorensek} } @article {803, title = {Development of the hybrid sulfur cycle for use with concentrated solar heat. I. Conceptual design}, journal = {International Journal of Hydrogen Energy}, volume = {42}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {20939-20954}, abstract = {A detailed conceptual design of a solar hybrid sulfur (HyS) cycle is proposed. Numerous design tradeoffs, including process operating conditions and strategies, methods of integration with solar energy sources, and solar design options were considered. A baseline design was selected, and process flowsheets were developed. Pinch analyses were performed to establish the limiting energy efficiency. Detailed material and energy balances were completed, and a full stream table prepared. Design assumptions include use of: location in the southwest US desert, falling particle concentrated solar receiver, indirect heat transfer via pressurized helium, continuous operation with thermal energy storage, liquid-fed electrolyzer with PBI membrane, and bayonet-type acid decomposer. Thermochemical cycle efficiency for the HyS process was estimated to be 35.0\%, LHV basis. The solar-to-hydrogen (STH) energy conversion ratio was 16.9\%. This exceeds the Year 2015 DOE STCH target of STH >10\%, and shows promise for meeting the Year 2020 target of 20\%.}, issn = {0360-3199}, doi = {10.1016/j.ijhydene.2017.06.241}, url = {http://www.sciencedirect.com/science/article/pii/S0360319917327027}, author = {Maximilian B. Gorensek and Claudio Corgnale and William A. Summers} } @article {965, title = {The Effect of Uranium Cations on the Redox Properties of CeO2 Within the Context of Hydrogen Production from Water}, journal = {Topics in Catalysis}, volume = {58}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {143-148}, issn = {1022-5528, 1572-9028}, doi = {10.1007/s11244-014-0353-x}, url = {http://link.springer.com/10.1007/s11244-014-0353-x}, author = {Jessica Scaranto and Hicham Idriss} } @article {1027, title = {Electrochemical Hydrogen Compression: Efficient Pressurization Concept Derived from an Energetic Evaluation}, journal = {Journal of The Electrochemical Society}, volume = {164}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {F1187-F1195}, abstract = {Electrochemical hydrogen compression is a potentially high efficient, low-maintenance and silent technology to produce high pressure hydrogen. A new pressure concept with increased compression efficiency, termed intermediate differential pressure polymer electrolyte water electrolysis is proposed. With slightly pressurized oxygen and a much higher hydrogen pressure, this pressure concept profits from the advantages of the lower gas crossover of differential (only hydrogen compressed) pressure water electrolysis and the improved oxygen evolution reaction kinetics with increasing pressure of balanced pressure operation. Data for gas pressures up to 100 MPa is modeled, based on experimental results up to 5 MPa, of the three pressure concepts and validated with literature data up to 70 MPa. While differential pressure electrolyzer operation, following ideal isothermal compression, can be more efficient than today{\textquoteright}s best mechanical compressors up to 40 MPa, the intermediate pressure concept shows higher compression efficiency up to 90 MPa.}, issn = {0013-4651, 1945-7111}, doi = {10.1149/2.1361712jes}, url = {http://jes.ecsdl.org/content/164/12/F1187}, author = {Michel Suermann and Thomas Kiupel and Thomas J. Schmidt and Felix N. B{\"u}chi} } @article {1023, title = {Electrochemical investigation of electrocatalysts for the oxygen evolution reaction in PEM water electrolyzers}, journal = {International Journal of Hydrogen Energy}, volume = {33}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {4955-4961}, abstract = {To develop the proton exchange membrane water electrolyzer (PEMWE) with satisfactory performance and durability for application in a regenerative fuel cell (RFC) system, anode electrocatalysts of Ir, Ru and their oxides were prepared and incorporated into the catalyst coated membranes (CCM) of the PEMWE. Repetitive cyclic voltammetry of the Nafion bonded electrodes, steady state polarization curves and stability testing of the single PEMWE cells were performed to investigate the performance and stability of these electrocatalysts. The structure and specific surface areas of the electrocatalysts were characterized by XRD and BET. IrO2 exhibited a slightly lower performance but a markedly higher stability than the other electrocatalysts. By modifying the preparation process via a colloidal iridium hydroxide hydrate precursor, which permitted a lower heat treatment temperature, its performance was enhanced, corresponding to a terminal voltage of 1.63V at 1A/cm2.}, issn = {0360-3199}, doi = {10.1016/j.ijhydene.2008.06.039}, url = {http://www.sciencedirect.com/science/article/pii/S0360319908007520}, author = {Shidong Song and Huamin Zhang and Xiaoping Ma and Zhigang Shao and Richard T. Baker and Baolian Yi} } @article {932, title = {Enhanced Oxidation Kinetics in Thermochemical Cycling of CeO 2 through Templated Porosity}, journal = {The Journal of Physical Chemistry C}, volume = {117}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {1692-1700}, issn = {1932-7447, 1932-7455}, doi = {10.1021/jp309247c}, url = {http://pubs.acs.org/doi/abs/10.1021/jp309247c}, author = {Stephen G. Rudisill and Luke J. Venstrom and Nicholas D. Petkovich and Tingting Quan and Nicholas Hein and Daniel B. Boman and Jane H. Davidson and Andreas Stein} } @article {997, title = {Evaluation of proton-conducting membranes for use in a sulfur dioxide depolarized electrolyzer}, journal = {Journal of Power Sources}, volume = {195}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {2823-2829}, abstract = {The chemical stability, sulfur dioxide transport, ionic conductivity, and electrolyzer performance have been measured for several commercially available and experimental proton exchange membranes (PEMs) for use in a sulfur dioxide depolarized electrolyzer (SDE). The SDEs function is to produce hydrogen by using the Hybrid Sulfur (HyS) Process, a sulfur-based electrochemical/thermochemical hybrid cycle. Membrane stability was evaluated using a screening process where each candidate PEM was heated at 80{\textdegree}C in 60wt\% H2SO4 for 24h. Following acid exposure, chemical stability for each membrane was evaluated by FTIR using the ATR sampling technique. Membrane SO2 transport was evaluated using a two-chamber permeation cell. SO2 was introduced into one chamber whereupon SO2 transported across the membrane into the other chamber and oxidized to H2SO4 at an anode positioned immediately adjacent to the membrane. The resulting current was used to determine the SO2 flux and SO2 transport. Additionally, membrane electrode assemblies (MEAs) were prepared from candidate membranes to evaluate ionic conductivity and selectivity (ionic conductivity vs. SO2 transport) which can serve as a tool for selecting membranes. MEAs were also performance tested in a HyS electrolyzer measuring current density vs. a constant cell voltage (1V, 80{\textdegree}C in SO2 saturated 30wt\% H2SO4). Finally, candidate membranes were evaluated considering all measured parameters including SO2 flux, SO2 transport, ionic conductivity, HyS electrolyzer performance, and membrane stability. Candidate membranes included both PFSA and non-PFSA polymers and polymer blends of which the non-PFSA polymers, BPVE-6F and PBI, showed the best selectivity.}, issn = {0378-7753}, doi = {10.1016/j.jpowsour.2009.11.031}, url = {http://www.sciencedirect.com/science/article/pii/S0378775309020394}, author = {Mark C. Elvington and Hector Colon-Mercado and Steve McCatty and Simon G. Stone and David T. Hobbs} } @article {971, title = {Experimental demonstration of the thermochemical reduction of ceria in a solar aerosol reactor}, journal = {Industrial \& Engineering Chemistry Research}, volume = {55}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {10618-10625}, issn = {0888-5885, 1520-5045}, doi = {10.1021/acs.iecr.6b02853}, url = {http://pubs.acs.org/doi/abs/10.1021/acs.iecr.6b02853}, author = {Michael Welte and Rafik Barhoumi and Adrian Zbinden and Jonathan R. Scheffe and Aldo Steinfeld} } @article {986, title = {Exploring the Redox Behavior of La0.6Sr0.4Mn1-xAlxO3 Perovskites for CO2-Splitting in Thermochemical Cycles}, journal = {Topics in Catalysis}, volume = {60}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {1108-1118}, issn = {1022-5528, 1572-9028}, doi = {10.1007/s11244-017-0790-4}, url = {http://link.springer.com/10.1007/s11244-017-0790-4}, author = {Daniel Sastre and Alfonso J. Carrillo and David P. Serrano and Patricia Pizarro and Juan M. Coronado} } @article {767, title = {Fabrication and testing of CONTISOL: A new receiver-reactor for day and night solar thermochemistry}, journal = {Applied Thermal Engineering}, volume = {127}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {46-57}, issn = {13594311}, doi = {10.1016/j.applthermaleng.2017.08.001}, url = {http://linkinghub.elsevier.com/retrieve/pii/S1359431116328502}, author = {Justin L. Lapp and Matthias Lange and Ren{\'e} Rieping and Lamark de Oliveira and Martin Roeb and Christian Sattler} } @article {935, title = {Factors affecting the efficiency of solar driven metal oxide thermochemical cycles}, journal = {Industrial \& Engineering Chemistry Research}, volume = {52}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {3276-3286}, issn = {0888-5885, 1520-5045}, doi = {10.1021/ie400193q}, url = {http://pubs.acs.org/doi/abs/10.1021/ie400193q}, author = {Nathan P. Siegel and James E. Miller and Ivan Ermanoski and Richard B. Diver and Ellen B. Stechel} } @article {974, title = {H 2 O splitting via a two-step solar thermoelectrolytic cycle based on non-stoichiometric ceria redox reactions: Thermodynamic analysis}, journal = {International Journal of Hydrogen Energy}, volume = {42}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {18785-18793}, issn = {03603199}, doi = {10.1016/j.ijhydene.2017.06.098}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0360319917324114}, author = {Garrett L. Schieber and Ellen B. Stechel and Andrea Ambrosini and James E. Miller and Peter G. Loutzenhiser} } @article {1039, title = {High Temperature Electrolysis for Hydrogen Production from Nuclear Energy {\textendash} TechnologySummary}, number = {INL/EXT-09-16140}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, abstract = {The U.S. Department of Energy{\textquoteright}s Office of Scientific and Technical Information}, url = {https://www.osti.gov/biblio/978368-high-temperature-electrolysis-hydrogen-production-from-nuclear-energy-technologysummary}, author = {J. E. O{\textquoteright}Brien and C. M. Stoots and J. S. Herring and M. G. McKellar and E. A. Harvego and M. S. Sohal and K. G. Condie} } @article {970, title = {High temperature hydrogen production: Design of a 750kW demonstration plant for a two-step thermochemical cycle}, journal = {Solar Energy}, volume = {135}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {232-241}, issn = {0038092X}, doi = {10.1016/j.solener.2016.05.059}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0038092X16301773}, author = {J.-P. S{\"a}ck and S. Breuer and P. Cotelli and A. Houaijia and M. Lange and M. Wullenkord and C. Spenke and M. Roeb and Chr. Sattler} } @article {887, title = {High-flux solar-driven thermochemical dissociation of CO2 and H2O using nonstoichiometric ceria}, journal = {Science}, volume = {330}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {1797-1801}, issn = {0036-8075, 1095-9203}, doi = {10.1126/science.1197834}, url = {http://www.sciencemag.org/cgi/doi/10.1126/science.1197834}, author = {W. C. Chueh and C. Falter and M. Abbott and D. Scipio and P. Furler and S. M. Haile and A. Steinfeld} } @article {969, title = {High-throughput computational screening of perovskites for thermochemical water splitting applications}, journal = {Chemistry of Materials}, volume = {28}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {5621-5634}, abstract = {*The authors use high throughput DFT to screen all possible simple, binary ABO3 perovskite formulations for gas-splitting favorability. It is the first demonstration of DFT applied to STC materials in this manner and points to the potential future impacts of computational chemistry in this field.}, issn = {0897-4756, 1520-5002}, doi = {10.1021/acs.chemmater.6b01182}, url = {http://pubs.acs.org/doi/abs/10.1021/acs.chemmater.6b01182}, author = {Antoine A. Emery and James E. Saal and Scott Kirklin and Vinay I. Hegde and Chris Wolverton} } @article {1036, title = {Hydrogen Production From Water Electrolysis: Current Status and Future Trends}, journal = {Proceedings of the IEEE}, volume = {100}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {410-426}, abstract = {This paper reviews water electrolysis technologies for hydrogen production and also surveys the state of the art of water electrolysis integration with renewable energies. First, attention is paid to the thermodynamic and electrochemical processes to better understand how electrolysis cells work and how they can be combined to build big electrolysis modules. The electrolysis process and the characteristics, advantages, drawbacks, and challenges of the three main existing electrolysis technologies, namely alkaline, polymer electrolyte membrane, and solid oxide electrolyte, are then discussed. Current manufacturers and the main features of commercially available electrolyzers are extensively reviewed. Finally, the possible configurations allowing the integration of water electrolysis units with renewable energy sources in both autonomous and grid-connected systems are presented and some relevant demonstration projects are commented.}, issn = {0018-9219}, doi = {10.1109/JPROC.2011.2156750}, author = {A. Ursua and L. M. Gandia and P. Sanchis} } @article {758, title = {Incommensurate Sinusoidal Oxygen Modulations in Layered Manganites La 1 - x Sr 1 + x MnO 4 ( x >= 0.5 )}, journal = {Physical Review Letters}, volume = {109}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, issn = {0031-9007, 1079-7114}, doi = {10.1103/PhysRevLett.109.107202}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.109.107202}, author = {Joaqu{\'\i}n Garc{\'\i}a and Javier Herrero-Mart{\'\i}n and Gloria Sub{\'\i}as and Javier Blasco and J. S. Andreu and M. Concepci{\'o}n S{\'a}nchez} } @article {847, title = {Intrinsic material properties dictating oxygen vacancy formation energetics in metal oxides}, journal = {The Journal of Physical Chemistry Letters}, volume = {6}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {1948-1953}, abstract = {*The authors use first-principles calculations to explore the relationship between the energy required to form an oxygen vacancy and intrinsic bulk material properties. They derive a simple model that predicts vacancy formation energy at substantially reduced computational cost which may facilitate high throughput computational screening of STC materials.}, issn = {1948-7185}, doi = {10.1021/acs.jpclett.5b00710}, url = {http://pubs.acs.org/doi/abs/10.1021/acs.jpclett.5b00710}, author = {Ann M. Deml and Aaron M. Holder and Ryan P. O{\textquoteright}Hayre and Charles B. Musgrave and Vladan Stevanovi{\'c}} } @article {748, title = {Investigation of oxygen vacancies in CeO2/Pt system with synchrotron light techniques}, journal = {Journal of Physics: Conference Series}, volume = {712}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {012064}, issn = {1742-6596}, doi = {10.1088/1742-6596/712/1/012064}, url = {https://doi.org/10.1088\%2F1742-6596\%2F712\%2F1\%2F012064}, author = {L. Braglia and A. L. Bugaev and K. A. Lomachenko and A. V. Soldatov and C. Lamberti and A. A. Guda} } @article {1014, title = {Investigations on degradation of the long-term proton exchange membrane water electrolysis stack}, journal = {Journal of Power Sources}, volume = {267}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {515-520}, abstract = {A 9-cell proton exchange membrane (PEM) water electrolysis stack is developed and tested for 7800~h. The average degradation rate of 35.5~μV~h-1 per cell is measured. The 4th MEA of the stack is offline investigated and characterized. The electrochemical impedance spectroscopy (EIS) shows that the charge transfer resistance and ionic resistance of the cell both increase. The linear sweep scan (LSV) shows the hydrogen crossover rate of the membrane has slight increase. The electron probe X-ray microanalyze (EPMA) illustrates further that Ca, Cu and Fe elements distribute in the membrane and catalyst layers of the catalyst-coated membranes (CCMs). The cations occupy the ion exchange sites of the Nafion polymer electrolyte in the catalyst layers and membrane, which results in the increase in the anode and the cathode overpotentials. The metallic impurities originate mainly from the feed water and the components of the electrolysis unit. Fortunately, the degradation was reversible and can be almost recovered to the initial performance by using 0.5~M H2SO4. This indicates the performance degradation of the stack running 7800~h is mainly caused by a recoverable contamination.}, issn = {0378-7753}, doi = {10.1016/j.jpowsour.2014.05.117}, url = {http://www.sciencedirect.com/science/article/pii/S0378775314008106}, author = {Shucheng Sun and Zhigang Shao and Hongmei Yu and Guangfu Li and Baolian Yi} } @article {926, title = {Isothermal Water Splitting}, journal = {Science}, volume = {341}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {470-471}, issn = {0036-8075, 1095-9203}, doi = {10.1126/science.1241311}, url = {http://www.sciencemag.org/cgi/doi/10.1126/science.1241311}, author = {M. Roeb and C. Sattler} } @article {945, title = {Kinetics of CO2 reduction over nonstoichiometric ceria}, journal = {The Journal of Physical Chemistry C}, volume = {119}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {16452-16461}, issn = {1932-7447, 1932-7455}, doi = {10.1021/acs.jpcc.5b03464}, url = {http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.5b03464}, author = {Simon Ackermann and Laurent Sauvin and Roberto Castiglioni and Jennifer L. M. Rupp and Jonathan R. Scheffe and Aldo Steinfeld} } @article {934, title = {Lanthanum{\textendash}strontium{\textendash}manganese perovskites as redox materials for solar thermochemical splitting of H2O and CO2}, journal = {Energy \& Fuels}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {130304073847002}, issn = {0887-0624, 1520-5029}, doi = {10.1021/ef301923h}, url = {http://pubs.acs.org/doi/abs/10.1021/ef301923h}, author = {Jonathan R. Scheffe and David Weibel and Aldo Steinfeld} } @article {1010, title = {Low-Cost and Durable Bipolar Plates for Proton Exchange Membrane Electrolyzers}, journal = {Scientific Reports}, volume = {7}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {44035}, abstract = {Cost reduction and high efficiency are the mayor challenges for sustainable H2 production via proton exchange membrane (PEM) electrolysis. Titanium-based components such as bipolar plates (BPP) have the largest contribution to the capital cost. This work proposes the use of stainless steel BPPs coated with Nb and Ti by magnetron sputtering physical vapor deposition (PVD) and vacuum plasma spraying (VPS), respectively. The physical properties of the coatings are thoroughly characterized by scanning electron, atomic force microscopies (SEM, AFM); and X-ray diffraction, photoelectron spectroscopies (XRD, XPS). The Ti coating (50 μm) protects the stainless steel substrate against corrosion, while a 50-fold thinner layer of Nb decreases the contact resistance by almost one order of magnitude. The Nb/Ti-coated stainless steel bipolar BPPs endure the harsh environment of the anode for more than 1000 h of operation under nominal conditions, showing a potential use in PEM electrolyzers for large-scale H2 production from renewables.}, issn = {2045-2322}, doi = {10.1038/srep44035}, url = {https://www.nature.com/articles/srep44035}, author = {P. Lettenmeier and R. Wang and R. Abouatallah and B. Saruhan and O. Freitag and P. Gazdzicki and T. Morawietz and R. Hiesgen and A. S. Gago and K. A. Friedrich} } @article {958, title = {Low-temperature reducibility of MxCe1{\textendash}xO2(M = Zr, Hf) under hydrogen atmosphere}, journal = {The Journal of Physical Chemistry C}, volume = {120}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {118-125}, issn = {1932-7447, 1932-7455}, doi = {10.1021/acs.jpcc.5b10796}, url = {http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.5b10796}, author = {Alexander Bonk and Arndt Remhof and Annika C. Maier and Matthias Trottmann and Meike V. F. Schlupp and Corsin Battaglia and Ulrich F. Vogt} } @article {792, title = {Magnetic and electrical properties of quadruple perovskites with 12 layer structures Ba4LnM3O12 (Ln=rare earths; M=Ru, Ir): The role of metal{\textendash}metal bonding in perovskite-related oxides}, journal = {Journal of Solid State Chemistry}, volume = {183}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {1962-1969}, issn = {00224596}, doi = {10.1016/j.jssc.2010.06.023}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0022459610002744}, author = {Yuki Shimoda and Yoshihiro Doi and Makoto Wakeshima and Yukio Hinatsu} } @article {931, title = {Material Analysis of Coated Siliconized Silicon Carbide (SiSiC) Honeycomb Structures for Thermochemical Hydrogen Production}, journal = {Materials}, volume = {6}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {421-436}, issn = {1996-1944}, doi = {10.3390/ma6020421}, url = {http://www.mdpi.com/1996-1944/6/2/421/}, author = {Martina Neises-von Puttkamer and Heike Simon and Martin Schm{\"u}cker and Martin Roeb and Christian Sattler and Robert Pitz-Paal} } @article {1009, title = {Materials for Proton Exchange Membrane water electrolyzer bipolar plates}, journal = {International Journal of Hydrogen Energy}, volume = {42}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {2713-2723}, abstract = {Titanium based BiPolar Plates (BPPs) are commonly used in Proton Exchange Membrane Water Electrolyzers (PEMWEs) today as they can withstand the harsh operating conditions experienced inside an operating PEM water electrolyzer. In particular, the high anode potential and acidic nature of the PEM is crucial for BPP performance. In this work we expand the investigation of non-coated materials at relevant operating conditions to include molybdenum, 254 SMO, tungsten, AISI 316L, AISI 304L, Inconel 625, niobium and tantalum, in addition to Titanium gr. 2. Pre-designed potentiostatic and potentiodynamic tests at potentials up to 2.0 VSHE were performed in addition to Interfacial Contact Resistance (ICR) and weight loss measurements. Scanning Electron Microscopy (SEM) imaging was conducted to observe morphology changes during the electrochemical tests. Titanium, tantalum and niobium experienced little or no weight change during potentiostatic polarization, while for AISI 304L, AISI 316L and tungsten the measured weight loss was much lower than the weight loss calculated from currents produced. When the potentiostatic test was prolonged for titanium, the ICR was found to increase with time. Auger Electron Spectroscopy measurements confirmed that the increase in ICR for titanium, tantalum and niobium is related to an increased thickness of surface oxides.}, issn = {0360-3199}, doi = {10.1016/j.ijhydene.2016.11.106}, url = {http://www.sciencedirect.com/science/article/pii/S0360319916307613}, author = {Sigrid L{\ae}dre and Ole Edvard Kongstein and Anders Oedegaard and H{\r a}vard Karoliussen and Frode Seland} } @article {912, title = {Materials-Related Aspects of Thermochemical Water and Carbon Dioxide Splitting: A Review}, journal = {Materials}, volume = {5}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {2015-2054}, issn = {1996-1944}, doi = {10.3390/ma5112015}, url = {http://www.mdpi.com/1996-1944/5/11/2015/}, author = {Martin Roeb and Martina Neises and Nathalie Monnerie and Friedemann Call and Heike Simon and Christian Sattler and Martin Schm{\"u}cker and Robert Pitz-Paal} } @article {892, title = {Metal Oxide Composites and Structures for Ultra-High Temperature Solar Thermochemical Cycles}, journal = {Journal of Materials Science}, volume = {43}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {4714-4728}, issn = {0022-2461, 1573-4803}, doi = {10.1007/s10853-007-2354-7}, url = {http://www.springerlink.com/index/10.1007/s10853-007-2354-7}, author = {James E. Miller and Mark D. Allendorf and Richard B. Diver and Lindsey R. Evans and Nathan P. Siegel and John N. Stuecker} } @article {772, title = {Observation of orbital ordering and Jahn-Teller distortions supporting the Wigner-crystal model in highly doped Bi 1 - x Ca x Mn O 3}, journal = {Physical Review B}, volume = {75}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, issn = {1098-0121, 1550-235X}, doi = {10.1103/PhysRevB.75.085101}, url = {https://link.aps.org/doi/10.1103/PhysRevB.75.085101}, author = {S. Grenier and V. Kiryukhin and S-W. Cheong and B. G. Kim and J. P. Hill and K. J. Thomas and J. M. Tonnerre and Y. Joly and U. Staub and V. Scagnoli} } @article {967, title = {Oxidation and reduction reaction kinetics of mixed cerium zirconium oxides}, journal = {The Journal of Physical Chemistry C}, volume = {120}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {2027-2035}, issn = {1932-7447, 1932-7455}, doi = {10.1021/acs.jpcc.5b08729}, url = {http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.5b08729}, author = {B. Bulfin and F. Call and J. Vieten and M. Roeb and C. Sattler and I. V. Shvets} } @article {897, title = {Oxidation reaction kinetics for the steam-iron process in support of hydrogen production}, journal = {International Journal of Hydrogen Energy}, volume = {36}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {15125-15135}, issn = {03603199}, doi = {10.1016/j.ijhydene.2011.08.074}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0360319911019951}, author = {R.C. Stehle and M.M. Bobek and R. Hooper and D.W. Hahn} } @article {948, title = {Oxygen exchange materials for solar thermochemical splitting of H2O and CO2: A review}, journal = {Materials Today}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, issn = {13697021}, doi = {10.1016/j.mattod.2014.04.025}, url = {http://linkinghub.elsevier.com/retrieve/pii/S1369702114001357}, author = {Jonathan R. Scheffe and Aldo Steinfeld} } @article {976, title = {Oxygen nonstoichiometry, defect equilibria, and thermodynamic characterization of LaMnO3 perovskites with Ca/Sr A-site and Al B-site doping}, journal = {Acta Materialia}, volume = {103}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {700-710}, issn = {13596454}, doi = {10.1016/j.actamat.2015.10.026}, url = {http://linkinghub.elsevier.com/retrieve/pii/S1359645415300264}, author = {M. Takacs and M. Hoes and M. Caduff and T. Cooper and J.R. Scheffe and A. Steinfeld} } @article {1032, title = {Quality Assurance of Solid Oxide Fuel Cell (SOFC) and Electrolyser (SOEC) Stacks}, journal = {ECS Transactions}, volume = {78}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {2077-2086}, abstract = {In the EU-funded project {\textquotedblleft}Solid oxide cell and stack testing and quality assurance{\textquotedblright} (SOCTESQA) standardized and industry wide test modules and programs for high temperature solid oxide cells and stacks are being developed. These test procedures can be applied for the fuel cell (SOFC), the electrolysis (SOEC) and in the combined SOFC/SOEC mode. In order to optimize the test modules the project partners have tested identical SOC stacks with the same test programs in several testing campaigns. Altogether 10 pre-normative test modules were developed: Start-up, current-voltage characteristics, electrochemical impedance spectroscopy, reactant utilization, reactant gas composition, temperature sensitivity, operation at constant current, operation at varying current, thermal cycling and shut-down. The test modules were validated by comparing the results in terms of repeatability of the different testing campaigns and in terms of reproducibility among the different partners. Moreover, the results are discussed in context to the test input parameters.}, issn = {1938-6737, 1938-5862}, doi = {10.1149/07801.2077ecst}, url = {http://ecst.ecsdl.org/content/78/1/2077}, author = {Michael Lang and Corinna Auer and Karine Couturier and Xiufu Sun and Stephen J. McPhail and Thomas Malkow and Qingxi Fu and Qinglin Liu} } @article {756, title = {Rate Constants of Electrochemical Reactions in a Lithium-Sulfur Cell Determined by Operando X-ray Absorption Spectroscopy}, journal = {Journal of The Electrochemical Society}, volume = {165}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {A3487-A3495}, abstract = {The reduction of sulfur during discharge in a lithium-sulfur (Li-S) cell is known to occur in a series of reaction steps that involve lithium polysulfide intermediates. We present an operando study of the discharge of a solid-state Li-S cell using X-ray absorption spectroscopy (XAS). In theory, the average chain length of the polysulfides, xavg,cell, at a given depth of discharge is determined by the number of electrons delivered to the sulfur cathode. The dependence of xavg,cell measured by XAS on the depth of discharge is in excellent agreement with theoretical predictions. XAS is also used to track the formation of Li2S, the final discharge product, as a function of depth of discharge. The XAS measurements were used to estimate rate constants of a series of simple reactions commonly accepted in literature.}, issn = {0013-4651, 1945-7111}, doi = {10.1149/2.0981814jes}, url = {http://jes.ecsdl.org/content/165/14/A3487}, author = {Dunyang Rita Wang and Deep B. Shah and Jacqueline A. Maslyn and Whitney S. Loo and Kevin H. Wujcik and Erik J. Nelson and Matthew J. Latimer and Jun Feng and David Prendergast and Tod A. Pascal and Nitash P. Balsara} } @article {987, title = {Redox thermodynamics and phase composition in the system SrFeO 3-δ {\textemdash} SrMnO 3-δ}, journal = {Solid State Ionics}, volume = {308}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {149-155}, issn = {01672738}, doi = {10.1016/j.ssi.2017.06.014}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0167273817302990}, author = {J. Vieten and B. Bulfin and M. Senholdt and M. Roeb and C. Sattler and M. Schm{\"u}cker} } @article {936, title = {Re-energizing CO2 to fuels with the sun: Issues of efficiency, scale, and economics}, journal = {Journal of CO2 Utilization}, volume = {1}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {28-36}, issn = {22129820}, doi = {10.1016/j.jcou.2013.03.008}, url = {http://linkinghub.elsevier.com/retrieve/pii/S2212982013000115}, author = {Ellen B. Stechel and James E. Miller} } @article {771, title = {Resonant soft x-ray powder diffraction study to determine the orbital ordering in A-site-ordered SmBaMn 2 O 6}, journal = {Physical Review B}, volume = {77}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, issn = {1098-0121, 1550-235X}, doi = {10.1103/PhysRevB.77.060402}, url = {https://link.aps.org/doi/10.1103/PhysRevB.77.060402}, author = {M. Garc{\'\i}a-Fern{\'a}ndez and U. Staub and Y. Bodenthin and S. M. Lawrence and A. M. Mulders and C. E. Buckley and S. Weyeneth and E. Pomjakushina and K. Conder} } @article {920, title = {Review: Photochemical and thermochemical production of solar fuels from H2O and CO2 using metal oxide catalysts}, journal = {Industrial \& Engineering Chemistry Research}, volume = {51}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {11828-11840}, issn = {0888-5885, 1520-5045}, doi = {10.1021/ie3007962}, url = {http://pubs.acs.org/doi/abs/10.1021/ie3007962}, author = {Greg P. Smestad and Aldo Steinfeld} } @article {909, title = {Solar Thermochemical CO2 Splitting Utilizing a Reticulated Porous Ceria Redox System}, journal = {Energy \& Fuels}, volume = {26}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {7051-7059}, issn = {0887-0624}, doi = {10.1021/ef3013757}, url = {http://dx.doi.org/10.1021/ef3013757}, author = {Philipp Furler and Jonathan Scheffe and Michal Gorbar and Louis Moes and Ulrich Vogt and Aldo Steinfeld} } @article {968, title = {Solar thermochemical hydrogen production using ceria zirconia solid solutions: Efficiency analysis}, journal = {International Journal of Hydrogen Energy}, volume = {41}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {19320-19328}, issn = {03603199}, doi = {10.1016/j.ijhydene.2016.05.211}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0360319916307650}, author = {Brendan Bulfin and Matthias Lange and Lamark de Oliveira and Martin Roeb and Christian Sattler} } @article {828, title = {Solar thermochemical production of hydrogen{\textendash}{\textendash}a review}, journal = {Solar Energy}, volume = {78}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {603-615}, issn = {0038092X}, doi = {10.1016/j.solener.2003.12.012}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0038092X03004663}, author = {Aldo Steinfeld} } @article {827, title = {Solar water splitting for hydrogen production with monolithic reactors}, journal = {Solar Energy}, volume = {79}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {409-421}, issn = {0038092X}, doi = {10.1016/j.solener.2005.02.026}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0038092X05001465}, author = {C. Agrafiotis and M. Roeb and A.G. Konstandopoulos and L. Nalbandian and V.T. Zaspalis and C. Sattler and P. Stobbe and A.M. Steele} } @article {1033, title = {Solid oxide proton conducting steam electrolysers}, journal = {Solid State Ionics}, volume = {179}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {1120-1124}, abstract = {Proton conducting ceramics based on acceptor doped perovskites are the subject of investigation as candidate electrolyte materials for Solid Oxide Electrolyser Cells (SOECs) that operate at intermediate temperatures. Initial work has focused on BaCe0.9Y0.1O3-δ (BCY10) and BaZr0.9Y0.1O3-δ (BZY10) as these materials have been proven to have high proton conductivities [K.H. Ryu, M. Haile, Solid State Ionics 125 (1999) 355]. Conductivity data from AC impedance spectroscopy measurements for BCY10 is in agreement with the literature. BZY10 doped with 1~wt.\% ZnO was found to have a significantly lower conductivity between 200 and 600~{\textdegree}C than BCY10. BCY10 has been confirmed as a suitable electrolyte material for a reversible proton conducting solid oxide fuel cell. Large losses are observed at lower temperatures in electrolysis mode and are attributed to the slow progression of reactions at the electrodes.}, issn = {0167-2738}, doi = {10.1016/j.ssi.2008.01.067}, url = {http://www.sciencedirect.com/science/article/pii/S0167273808001082}, author = {Paul A. Stuart and Toshiyuki Unno and John A. Kilner and Stephen J. Skinner} } @article {870, title = {Splitting CO2 with a ceria-based redox cycle in a solar-driven thermogravimetric analyzer}, journal = {AIChE Journal}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, issn = {00011541}, doi = {10.1002/aic.15501}, url = {http://doi.wiley.com/10.1002/aic.15501}, author = {M. Takacs and S. Ackermann and A. Bonk and M. Neises-von Puttkamer and Ph. Haueter and J. R. Scheffe and U. F. Vogt and A. Steinfeld} } @article {1024, title = {Sputtered iridium oxide films as electrocatalysts for water splitting via PEM electrolysis}, journal = {Electrochimica Acta}, volume = {52}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {3889-3894}, abstract = {Thin films of iridium oxide deposited by reactive magnetron sputtering have been investigated as catalysts for electrochemical water splitting in a polymer electrolyte membrane (PEM) cell. The sputtered films possess excellent mechanical stability and corrosion resistance at the high anodic potentials where oxygen evolution takes place. Their catalytic activity has been assessed using the conventional electrochemical methods of cyclovoltammetry and steady state polarisation techniques. A morphology factor assessing the catalyst active surface for a series of sputtered samples with varying thickness/loading has been determined and correlated to the catalytic efficiency. It has been proven that iridium oxide is a very efficient catalyst for oxygen evolution reaction (OER). The best performance with anodic current density of 0.3Acm-2 at potential of 1.55V (versus RHE) has shown the 500nm thick film containing 0.2mgcm-2 catalyst. The results obtained have also demonstrated the advantages of the reactive magnetron sputtering as simple and reliable method for deposition of efficient and cost effective catalysts for PEM electrolysis application.}, issn = {0013-4686}, doi = {10.1016/j.electacta.2006.11.005}, url = {http://www.sciencedirect.com/science/article/pii/S0013468606011571}, author = {E. Slavcheva and I. Radev and S. Bliznakov and G. Topalov and P. Andreev and E. Budevski} } @article {1003, title = {Standardized Benchmarking of Water Splitting Catalysts in a Combined Electrochemical Flow Cell/Inductively Coupled Plasma{\textendash}Optical Emission Spectrometry (ICP-OES) Setup}, journal = {ACS Catalysis}, volume = {7}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {3768-3778}, abstract = {The oxygen evolution reaction (OER) is the limiting step in splitting water into its constituents, hydrogen and oxygen. Hence, research on potential OER catalysts has become the focus of many studies. In this work, we investigate capable OER catalysts but focus on catalyst stability, which is, especially in this case, at least equally as important as catalyst activity. We propose a specialized setup for monitoring the corrosion profiles of metal oxide catalysts during a stability testing protocol, which is specifically designed to standardize the investigation of OER catalysts by means of differentiating between catalyst corrosion and deactivation, oxygen evolution efficiency, and catalyst activity. For this purpose, we combined an electrochemical flow cell (EFC) with an oxygen sensor and an inductively coupled plasma{\textendash}optical emission spectrometry (ICP-OES) system for the simultaneous investigation of catalyst deactivation, activity, and faradaic efficiency of catalysts. We tested various catalysts, with IrO2 and NiCoO2 used as benchmark materials in acidic and alkaline environment, respectively. The scalability of our setup will allow the user to investigate catalytic materials with supports of higher surface area than those which are typical for microelectrochemical flow cells (thus, under conditions more similar to those of commercial electrolyzers).}, doi = {10.1021/acscatal.7b00632}, url = {https://doi.org/10.1021/acscatal.7b00632}, author = {Ioannis Spanos and Alexander A. Auer and Sebastian Neugebauer and Xiaohui Deng and Harun T{\"u}ys{\"u}z and Robert Schl{\"o}gl} } @article {757, title = {Structural Change of the Mn Cluster during the S2{\textrightarrow}S3 State Transition of the Oxygen-Evolving Complex of Photosystem II. Does It Reflect the Onset of Water/Substrate Oxidation? Determination by Mn X-ray Absorption Spectroscopy}, journal = {Journal of the American Chemical Society}, volume = {122}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {3399-3412}, abstract = {The oxygen-evolving complex of Photosystem II in plants and cyanobacteria catalyzes the oxidation of two water molecules to one molecule of dioxygen. A tetranuclear Mn complex is believed to cycle through five intermediate states (S0-S4) to couple the four-electron oxidation of water with the one-electron photochemistry occurring at the Photosystem II reaction center. We have used X-ray absorption spectroscopy to study the local structure of the Mn complex and have proposed a model for it, based on studies of the Mn K-edges and the extended X-ray absorption fine structure of the S1 and S2 states. The proposed model consists of two di-μ-oxo-bridged binuclear Mn units with Mn-Mn distances of \~{}2.7 {\r A} that are linked to each other by a mono-μ-oxo bridge with a Mn-Mn separation of \~{}3.3 {\r A}. The Mn-Mn distances are invariant in the native S1 and S2 states. This report describes the application of X-ray absorption spectroscopy to S3 samples created under physiological conditions with saturating flash illumination. Significant changes are observed in the Mn-Mn distances in the S3 state compared to the S1 and the S2 states. The two 2.7 {\r A} Mn-Mn distances that characterize the di-μ-oxo centers in the S1 and S2 states are lengthened to \~{}2.8 and 3.0 {\r A} in the S3 state, respectively. The 3.3 {\r A} Mn-Mn and Mn-Ca distances also increase by 0.04-0.2 {\r A}. These changes in Mn-Mn distances are interpreted as consequences of the onset of substrate/water oxidation in the S3 state. Mn-centered oxidation is evident during the S0{\textrightarrow}S1 and S1{\textrightarrow}S2 transitions. We propose that the changes in Mn-Mn distances during the S2{\textrightarrow}S3 transition are the result of ligand or water oxidation, leading to the formation of an oxyl radical intermediate formed at a bridging or terminal position. The reaction of the oxyl radical with OH-, H2O, or an oxo group during the subsequent S state conversion is proposed to lead to the formation of the O-O bond. Models that can account for changes in the Mn-Mn distances in the S3 state and the implications for the mechanism of water oxidation are discussed.}, issn = {0002-7863}, doi = {10.1021/ja992501u}, url = {https://doi.org/10.1021/ja992501u}, author = {Wenchuan Liang and Theo A. Roelofs and Roehl M. Cinco and Annette Rompel and Matthew J. Latimer and Wa O. Yu and Kenneth Sauer and Melvin P. Klein and Vittal K. Yachandra} } @article {752, title = {On the structural stability of crystalline ceria phases in undoped and acceptor-doped ceria materials under in situ reduction conditions}, journal = {Crystengcomm}, volume = {21}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {145-154}, abstract = {The reduction of pure and Sm-doped ceria in hydrogen has been studied by synchrotron-based in situ X-ray diffraction to eventually prove or disprove the presence of crystalline cerium hydride (CeHx) phases and the succession of potential structural phase (trans)formations of reduced cerium oxide phases during heating-cooling cycles up to 1273 K. Despite a recent report on the existence of bulk and surface CeHx phases during reductive treatment of pure CeO2 in H-2, structural analysis by Rietveld refinement as well as additional H-1-NMR spectroscopy did not reveal the presence of any crystalline CeHx phase. Rather, a sequence of phase transformations during the re-cooling process in H-2 has been observed. In both samples, the reduced/defective fluorite lattice undergoes at first a transformation into a bixbyite-type lattice with a formal stoichiometry Ce0.583+Ce0.424+O1.71 and Sm0.153+Ce0.393+Ce0.464+O1.73, before a transformation into rhombohedral Ce7O12 takes place in pure CeO2. This phase is clearly absent for the Sm-doped material. Finally, a triclinic Ce11O20 phase appears for both materials, which can be recovered to room temperature, and on which a phase mixture of bixbyite Ce0.663+Ce0.344+O1.67, rh-Ce0.603+Ce0.404+O1.70 and tri-Ce0.483+Ce0.524+O1.76 (for pure CeO2) or bixbyite Sm0.153+Ce0.473+Ce0.384+O1.69 and tri-Sm0.153+Ce0.313+Ce0.544+O1.77 (for Sm-doped CeO2) prevails. The absence of the rhombohedral phase indicates that Sm doping leads to the stabilization of the bixbyite phase over the rhombohedral one at this particular oxygen vacancy concentration. It is worth noting that recent work proves that hydrogen is indeed incorporated within the structures during the heat treatments, but under the chosen experimental conditions it has apparently no effect on the salient structural principles during reduction.}, issn = {1466-8033}, doi = {10.1039/c8ce01726c}, author = {Maged F. Bekheet and Matthias Gruenbacher and Lukas Schlicker and Albert Gili and Andrew Doran and Jan Dirk Epping and Aleksander Gurlo and Bernhard Kloetzer and Simon Penner} } @article {885, title = {Sunshine to Petrol: A Metal Oxide-Based Thermochemical Route to Solar Fuels}, number = {SAND2009-4579A}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, author = {Albuquerque Sandia National Laboratories and James E. Miller and Richard B. Diver Jr. and Nathan Phillip Siegel and Eric Coker and Andrea Ambrosini and Daniel E. Dedrick and Mark D. Allendorf and Anthony H. McDaniel and Gary L Kellogg and Roy E. Hogan Jr. and Ken S. Chen and Ellen B. Stechel} } @article {779, title = {Surface structure of coherently strained ceria ultrathin films}, journal = {Physical Review B}, volume = {94}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, issn = {2469-9950, 2469-9969}, doi = {10.1103/PhysRevB.94.205420}, url = {https://link.aps.org/doi/10.1103/PhysRevB.94.205420}, author = {Yezhou Shi and Kevin H. Stone and Zixuan Guan and Matteo Monti and Chuntian Cao and Farid El Gabaly and William C. Chueh and Michael F. Toney} } @article {849, title = {Synthesis, Characterization, and Thermochemical Redox Performance of Hf 4+ , Zr 4+ , and Sc 3+ Doped Ceria for Splitting CO 2}, journal = {The Journal of Physical Chemistry C}, volume = {117}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {24104-24114}, issn = {1932-7447, 1932-7455}, doi = {10.1021/jp4050572}, url = {http://pubs.acs.org/doi/abs/10.1021/jp4050572}, author = {Jonathan R. Scheffe and Roger Jacot and Greta R. Patzke and Aldo Steinfeld} } @article {896, title = {Test operation of a 100kW pilot plant for solar hydrogen production from water on a solar tower}, journal = {Solar Energy}, volume = {85}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {634-644}, issn = {0038092X}, doi = {10.1016/j.solener.2010.04.014}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0038092X10001623}, author = {M. Roeb and J.-P. S{\"a}ck and P. Rietbrock and C. Prahl and H. Schreiber and M. Neises and L. de Oliveira and D. Graf and M. Ebert and W. Reinalter and M. Meyer-Gr{\"u}nefeldt and C. Sattler and A. Lopez and A. Vidal and A. Elsberg and P. Stobbe and D. Jones and A. Steele and S. Lorentzou and C. Pagkoura and A. Zygogianni and C. Agrafiotis and A.G. Konstandopoulos} } @article {949, title = {Thermal Reduction of Ceria within an Aerosol Reactor for H 2 O and CO 2 Splitting}, journal = {Industrial \& Engineering Chemistry Research}, volume = {53}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {2175-2182}, issn = {0888-5885, 1520-5045}, doi = {10.1021/ie402620k}, url = {http://pubs.acs.org/doi/abs/10.1021/ie402620k}, author = {Jonathan R. Scheffe and Michael Welte and Aldo Steinfeld} } @article {875, title = {Thermochemical hydrogen production by a redox system of ZrO2-supported Co(II)-ferrite}, journal = {Solar Energy}, volume = {78}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {623-631}, issn = {0038092X}, doi = {10.1016/j.solener.2004.04.008}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0038092X04000830}, author = {T. Kodama and Y. Kondoh and R. Yamamoto and H. Andou and N. Satou} } @article {952, title = {Thermochemical reactivity of 5{\textendash}15mol\% Fe, Co, Ni, Mn-doped cerium oxides in two-step water-splitting cycle for solar hydrogen production}, journal = {Thermochimica Acta}, volume = {617}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {179-190}, issn = {00406031}, doi = {10.1016/j.tca.2015.08.036}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0040603115003561}, author = {Nobuyuki Gokon and Toshinori Suda and Tatsuya Kodama} } @article {947, title = {Thermodynamics of CeO2 thermochemical fuel production}, journal = {Energy \& Fuels}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {150126104600001}, issn = {0887-0624, 1520-5029}, doi = {10.1021/ef5019912}, url = {http://pubs.acs.org/doi/abs/10.1021/ef5019912}, author = {B. Bulfin and F. Call and M. Lange and O. L{\"u}bben and C. Sattler and R. Pitz-Paal and I. V. Shvets} } @article {938, title = {Tunable oxygen vacancy formation energetics in the complex perovskite oxide SrxLa1{\textendash}xMnyAl1{\textendash}yO3}, journal = {Chemistry of Materials}, volume = {26}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {6595-6602}, issn = {0897-4756, 1520-5002}, doi = {10.1021/cm5033755}, url = {http://pubs.acs.org/doi/abs/10.1021/cm5033755}, author = {Ann M. Deml and Vladan Stevanovi{\'c} and Aaron M. Holder and Michael Sanders and Ryan O{\textquoteright}Hayre and Charles B. Musgrave} } @article {880, title = {Two-step water splitting using mixed-metal ferrites: Thermodynamic analysis and characterization of synthesized materials}, journal = {Energy \& Fuels}, volume = {22}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {4115-4124}, issn = {0887-0624, 1520-5029}, doi = {10.1021/ef8005004}, url = {http://pubs.acs.org/doi/abs/10.1021/ef8005004}, author = {Mark D. Allendorf and Richard B. Diver and Nathan P. Siegel and James E. Miller} } @article {940, title = {T{\textendash}S diagram efficiency analysis of two-step thermochemical cycles for solar water splitting under various process conditions}, journal = {Energy}, volume = {67}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {298-308}, issn = {03605442}, doi = {10.1016/j.energy.2014.01.112}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0360544214001509}, author = {M. Lange and M. Roeb and C. Sattler and R. Pitz-Paal} } @article {778, title = {Understanding crystallization pathways leading to manganese oxide polymorph formation}, journal = {Nature Communications}, volume = {9}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {2553}, abstract = {Minor variations in synthesis conditions can redirect crystallization pathways through different nonequilibrium intermediates. Here, the authors present a theoretical framework to predict which polymorphs appear during MnO2 precipitation, which is validated by in situ X-ray scattering of reaction progression.}, issn = {2041-1723}, doi = {10.1038/s41467-018-04917-y}, url = {https://www.nature.com/articles/s41467-018-04917-y}, author = {Bor-Rong Chen and Wenhao Sun and Daniil A. Kitchaev and John S. Mangum and Vivek Thampy and Lauren M. Garten and David S. Ginley and Brian P. Gorman and Kevin H. Stone and Gerbrand Ceder and Michael F. Toney and Laura T. Schelhas} } @article {1031, title = {Understanding the Current-Voltage Behavior of High Temperature Solid Oxide Fuel Cell Stacks}, journal = {Journal of The Electrochemical Society}, volume = {164}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {F1460-F1470}, abstract = {High temperature solid oxide fuel cell (SOFC) stacks are highly efficient and environmentally friendly electrochemical systems, which convert the chemical energy of fuel gases with oxygen from air directly into electrical energy. During operation of SOFC stacks under system operating conditions pronounced temperature and fuel gas composition gradients along the cell area and along the height of the stack occur. Therefore, in contrast to SOFC cells, the electrochemical behavior of SOFC stacks is much more complex and has not sufficiently been studied. Specially, a shortcoming exists in terms of understanding the homogeneity, performance loss mechanisms, and various resistances and overvoltages within the stack repeat components. Therefore, this paper focuses on the improvement of the understanding and of the interpretation of different current-voltage curves of solid oxide fuel cell stack repeat units. Three different cases are discussed: repeat units with high power performance, with high cell contact resistance and with high fuel utilization. The stacks were investigated by current-voltage curves, electrochemical impedance spectroscopy and gas analysis. In order to understand the electrochemical behavior of these three cases both experimental and modeling results are presented, compared and discussed.}, issn = {0013-4651, 1945-7111}, doi = {10.1149/2.1541713jes}, url = {http://jes.ecsdl.org/content/164/13/F1460}, author = {M. Lang and C. Bohn and M. Henke and G. Schiller and C. Willich and F. Hauler} } @article {973, title = {Vacuum pumping options for application in solar thermochemical redox cycles {\textendash} Assessment of mechanical-, jet- and thermochemical pumping systems}, journal = {Solar Energy}, volume = {141}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {91-102}, issn = {0038092X}, doi = {10.1016/j.solener.2016.11.023}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0038092X16305552}, author = {Stefan Brendelberger and Henrik von Storch and Brendan Bulfin and Christian Sattler} } @article {774, title = {Valence measurement of Mn oxides using Mn K-beta emission spectroscopy}, journal = {JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS}, volume = {61}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {547-460}, abstract = {High resolution Mn K-beta emission spectra provide a direct method to probe the effective spin state and charge density on Mn sites. Direct comparison of MnF2 and MnO reveals significant changes due to the degree of covalency. The detailed shape and energy shi of thr spectra for the perovskite LaMnO3 and CaMnO3 compounds are found to be very similar to Mn2O3 and MnO2, respectively. Detailed Mn K-beta X-ray emission results on La1-xCaxMnO3 can be well fit by linear superpositions of the end member spectra. However, for x < 0.3, a retarded response is found. No evidence for Mn2+ is found}, author = {Q Qian and TA Tyson and CC Kao and JP Rueff and FMF deGroot and M Croft and SW Cheong and M Breenblatt and MA Subramanian} } @article {1012, title = {Validation and characterization of suitable materials for bipolar plates in PEM water electrolysis}, journal = {International Journal of Hydrogen Energy}, volume = {40}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {11385-11391}, abstract = {The polymer electrolyte membrane (PEM) electrolysis cell is a promising prospect for the production of clean hydrogen by energy of renewable wind and solar sources. One component of the PEM electrolyzer is the bipolar plate (BPP), which serves as a multi-function component during PEM water electrolysis. Titanium is typically regarded as the state-of-the-art material. Mechanically it could potentially be replace by lower-cost materials such as stainless steel, but under the harsh environmental conditions present in PEM water electrolysis, stainless steel is not corrosion-resistant and metal ions can dissolve. In this case metal ions would poison the catalyst and membrane, which leads to a reduction in the cell performance [1]. We have tested several coatings such as Au and TiN in PEM water electrolysis environments of varying severity for the application as a protective layer of bipolar plates. In order to determine possible candidates for a long-term test under real simulated PEM water electrolysis conditions, an experiment to determine pH value in PEM water electrolysis operation was developed to obtain the required pH value for the ex-situ testing of various coating materials.}, issn = {0360-3199}, doi = {10.1016/j.ijhydene.2015.04.155}, url = {http://www.sciencedirect.com/science/article/pii/S0360319915010939}, author = {Manuel Langemann and David L. Fritz and Martin M{\"u}ller and Detlef Stolten} }