@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 {1142, title = {Intermediate Temperature Solid Oxide Cell with a Barrier Layer Free Oxygen Electrode and Phase Inversion Derived Hydrogen Electrode}, journal = {Journal of the Electrochemical Society}, volume = {169}, year = {2022}, month = {3}, keywords = {area specific resistance, cathode, electrical conductivity, intermediate temperature-operating solid oxide fuel cell, layered perovskite}, doi = {10.1149/1945-7111/ac565a}, author = {Zhang, Yongliang and Xu, Nansheng and Tang, Qiming and Huang, Kevin} } @article {1148, title = {Revitalizing interface in protonic ceramic cells by acid etch}, journal = {Nature}, volume = {604}, year = {2022}, month = {04}, pages = {479-485}, keywords = {acid treatment, ceramic fuel-cell, electrolysis, high-temperature annealed electrolyte surface, proton conductivity, Protonic ceramic electrochemical cells}, doi = {10.1038/s41586-022-04457-y}, author = {Bian, Wenjuan and Wu, Wei and Wang, Baoming and Tang, Wei and Zhou, Meng and Jin, Congrui and Ding, Hanping and Fan, Weiwei and Dong, Yanhao and Li, Ju and Ding, Dong} } @article {1153, title = {Chalkboard 2 - How to Make Clean Hydrogen}, journal = {The Electrochemical Society Interface}, volume = {30}, year = {2021}, month = {dec}, pages = {49{\textendash}56}, abstract = {Clean hydrogen is a carbon-free energy carrier that can be produced from water and sustainable energy sources such as wind, solar, and nuclear. Hence, clean hydrogen is one of the best ways to not only decarbonize the energy supply system, but also address the zero-emission challenges specific to large-carbon emitting industries that are difficult to separate from fossil fuels. To help achieve the Biden Administration{\textquoteright}s goal of a 100\% clean energy economy and net-zero emissions by 2050, several tens of millions of metric tons of clean, low-cost hydrogen will be needed annually. The HydroGEN Advanced Water Splitting Materials (AWSM) Consortium was established in 2016 as part of the Energy Materials Network (EMN) under the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Hydrogen and Fuel Cell Technologies Office to enhance the performance, improve the durability, and reduce the cost of clean hydrogen production technologies, and it is helping to advance the H2@Scale vision.}, keywords = {Clean hydrogen, decarbonization, energy supply system, hydrogen, zero-emission challenges}, doi = {10.1149/2.f13214if}, url = {https://doi.org/10.1149/2.f13214if}, author = {Shaun Alia and Dong Ding and Anthony McDaniel and Francesca M. Toma and Huyen N. Dinh} } @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 {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 {1164, title = {Regulation of Cathode Mass and Charge Transfer by Structural 3D Engineering for Protonic Ceramic Fuel Cell at 400 {\textdegree}C (Adv. Funct. Mater. 33/2021)}, journal = {Advanced Functional Materials}, volume = {31}, year = {2021}, pages = {2170244}, abstract = {3D Engineering In article number 2102907, Wei Wu, Meng Zhou, Dong Ding, and co-workers develop a 3D engineered cathode to enhance oxygen reduction reaction kinetics on a proton-conducting fuel cell at <600 {\textdegree}C. The results demonstrate remarkable cell performance at 400{\textendash}600 {\textdegree}C by effectively regulating the mass and charge transfer through the electrode and across the interface of electrolyte and electrode.}, keywords = {3D engineering, charge transfer, mass transfer, oxygen reduction reaction, p-SOEC, protonic ceramic fuel cells}, doi = {https://doi.org/10.1002/adfm.202170244}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/adfm.202170244}, author = {Bian, Wenjuan and Wu, Wei and Gao, Yipeng and Gomez, Joshua Y. and Ding, Hanping and Tang, Wei and Zhou, Meng and Ding, Dong} } @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 {1177, title = {Thin film growth effects on electrical conductivity in entropy stabilized oxides}, journal = {Journal of the European Ceramic Society}, volume = {41}, year = {2021}, pages = {2617-2624}, abstract = {Entropy stabilization has garnered significant attention as a new approach to designing novel materials. Much of the work in this area has focused on bulk ceramic processing, leaving entropy-stabilized thin films relatively under-explored. Following an extensive multi-variable investigation of polycrystalline (Mg0.2Co0.2Ni0.2Cu0.2Zn0.2)O thin films deposited via pulsed laser deposition (PLD), it is shown here that substrate temperature and deposition pressure have strong and repeatable effects on film texture and lattice parameter. Further analysis shows that films deposited at lower temperatures and under lower oxygen chamber pressure are \~{}40{\texttimes} less electrically resistive than otherwise identical films grown at higher temperature and pressure. Annealing these films in an oxygen-rich environment increases their electrical resistivity to match that of the films grown at higher temperatures and pressures. Because of this, the electric conductivity is hypothesized to be the result of polaron hopping mediated by transition metal valence changes which compensate for oxygen off-stoichiometry.}, keywords = {electrical conductivity, Entropy, oxide, Phase, Polycrystalline oxide thin films, Pulsed laser deposition, STCH, Thin film}, issn = {0955-2219}, doi = {https://doi.org/10.1016/j.jeurceramsoc.2020.12.021}, url = {https://www.sciencedirect.com/science/article/pii/S0955221920309900}, author = {V. Jacobson and D. Diercks and B. To and A. Zakutayev and G. Brennecka} } @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 {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 {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 {1123, title = {Predicting Spinel Disorder and Its Effect on Oxygen Transport Kinetics in Hercynite}, journal = {ACS Applied Materials \& Interfaces}, volume = {12}, year = {2020}, pages = {23831-23843}, keywords = {Hercynite, Spinel}, doi = {https://doi.org/10.1021/acsami.0c02819}, author = {R. M. Trottier and Z. J. L. Bare and S. L. Millican and C. B. Musgrave} } @article {1179, title = {Understanding of A-site deficiency in layered perovskites: promotion of dual reaction kinetics for water oxidation and oxygen reduction in protonic ceramic electrochemical cells}, journal = {J. Mater. Chem. A}, volume = {8}, year = {2020}, pages = {14600-14608}, abstract = {Protonic ceramic electrochemical cells (PCECs) are promising solid-state energy conversion devices which enable the conversion of energy between electricity and hydrogen at intermediate temperatures. Rapid conversion between chemical and electrical energy via PCEC technology will assist in overcoming grand challenges in energy storage. To achieve highly efficient reversible operation between hydrogen production and electricity generation, boosting water-oxidation and oxygen reduction activities of the oxygen electrode while maintaining the durable operation is one of the early-stage technical opportunities. In this study, an A-site deficient layered perovskite (PrBa0.8Ca0.2)0.95Co2O6-δ has been developed as an oxygen electrode for a PCEC which presents superior electrochemical performances. The electrolysis current density reached as high as -0.72 A cm-2 at 1.3 V, and a peak power density of 0.540 W cm-2 was obtained at 600 {\textdegree}C in electrolysis and fuel cell mode, respectively. The PCEC with the new electrode shows good durability under practical operating conditions for 160 hours in both operating modes with no observable degradation. The reversibility between the electrolysis and fuel cell mode is also successfully demonstrated.}, keywords = {Durability; HTE; Layered perovskite; Protonic ceramic electrochemical cells}, doi = {10.1039/D0TA05137C}, url = {http://dx.doi.org/10.1039/D0TA05137C}, author = {Tang, Wei and Ding, Hanping and Bian, Wenjuan and Wu, Wei and Li, Wenyuan and Liu, Xingbo and Gomez, Joshua Y. and Regalado Vera, Clarita Y. and Zhou, Meng and Ding, Dong} } @article {1061, title = {Assessment of co-sintering as a fabrication approach for metal-supported proton-conducting solid oxide cells}, journal = {Solid State Ionics}, volume = {332}, year = {2019}, month = {04/2019}, pages = {25-33}, abstract = {

Published on April 1st, 2019. Proton conducting oxide electrolyte materials could potentially lower the operating temperature of metal-supported solid oxide cells (MS-SOCs) to the intermediate range 400 to 600 {\textdegree}C. The porous metal substrate provides the advantages of MS-SOCs such as high thermal and redox cycling tolerance, low-cost of structural materials, and mechanical ruggedness. In this work, viability of co-sintering fabrication of metal-supported proton conducting solid oxide cells is investigated. Candidate proton conducting oxides including perovskite oxides BaZr0.7Ce0.2Y0.1O3-δ, SrZr0.5Ce0.4Y0.1O3-δ, and Ba3Ca1.18Nb1.82O9-δ, pyrochlore oxides La1.95Ca0.05Zr2O7-δ and La2Ce2O7, and acceptor doped rare-earth ortho-niobate La0.99Ca0.01NbO4 are synthesized via solid state reactive or sol-gel methods. These ceramics are sintered at 1450 {\textdegree}C in reducing environment alone and supported on Fe-Cr alloy metal support, and their key characteristics such as phase formation, sintering property, and chemical compatibility with metal support are determined. Most electrolyte candidates suffer from one or more challenges identified for this fabrication approach, including: phase decomposition in reducing atmosphere, evaporation of electrolyte constituents, contamination of the electrolyte with Si and Cr from the metal support, and incomplete electrolyte sintering. In contrast, La0.99Ca0.01NbO4 is found to be highly compatible with the metal support and co-sintering processing in reducing atmosphere. A metal-supported cell is fabricated with La0.99Ca0.01NbO4 electrolyte, ferritic stainless steel support, Pt air electrode and nanoparticulate ceria-Ni hydrogen electrocatalyst. The total resistance is 50 Ω{\textperiodcentered}cm2 at 600 {\textdegree}C. This work clearly demonstrates the challenges, opportunities, and breakthrough of metal-supported proton-conducting solid oxide cells by co-sintering fabrication.

}, issn = {0167-2738}, doi = {10.1016/j.ssi.2019.01.004}, url = {http://www.sciencedirect.com/science/article/pii/S0167273818309263}, author = {Ruofan Wang and Conor Byrne and Michael C. Tucker} } @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 {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 {1189, title = {Metal-Supported Solid Oxide Electrolysis Cell with Significantly Enhanced Catalysis}, journal = {Energy Technology}, volume = {7}, year = {2019}, pages = {1801154}, abstract = {High-temperature electrolysis (HTE) using solid oxide electrolysis cells (SOECs) is a promising hydrogen production technology and has attracted substantial research attention over the last decade. While most studies are conducted on hydrogen electrode-supported type cells, SOEC operation using metal-supported cells has received minimal attention. The development of metal-supported SOECs with performance similar to the best conventional SOECs is reported. These cells have stainless steel supports on both sides, 10Sc1CeSZ electrolyte and electrode backbones, and nano-structured catalysts infiltrated on both hydrogen and oxygen electrode sides. Samarium-doped ceria (SDC) mixed with Ni is infiltrated as a hydrogen electrode catalyst, and the effect of ceria:Ni ratio is studied. On the oxygen electrode side, catalysts including lanthanum strontium manganite (LSM), lanthanum strontium cobalt ferrite (LSCF), praseodymium oxide (Pr6O11), and their composite catalysts with SDC (i.e., LSM-SDC, LSCF-SDC, and Pr6O11-SDC) are compared. Using the materials with highest catalytic activity (Pr6O11-SDC and SDC40-Ni60) and optimizing the catalyst infiltration processes, excellent electrolysis performance of metal-supported cells is achieved. Current densities of -5.31, -4.09, -2.64, and -1.62 A cm-2 are achieved at 1.3 V and 50 vol\% steam content at 800, 750, 700, and 650 {\textdegree}C, respectively.}, keywords = {high-temperature steam electrolysis, Hydrogen production, infiltration, solid oxide electrolysis, solid oxide electrolyzer cells}, doi = {https://doi.org/10.1002/ente.201801154}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/ente.201801154}, author = {Wang, Ruofan and Dogdibegovic, Emir and Lau, Grace Y. and Tucker, Michael C.} } @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 {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 {1193, title = {Synergistic Coupling of Proton Conductors BaZr0.1Ce0.7Y0.1Yb0.1O3-δ and La2Ce2O7 to Create Chemical Stable, Interface Active Electrolyte for Steam Electrolysis Cells}, journal = {ACS Applied Materials \& Interfaces}, volume = {11}, year = {2019}, pages = {18323-18330}, keywords = {BaZr0.1Ce0.7Y0.1Yb0.1O3-δ, durability, HTE, La2Ce2O7, Protonic ceramic electrolysis cell, SOEC}, doi = {10.1021/acsami.9b00303}, url = {https://doi.org/10.1021/acsami.9b00303}, author = {Li, Wenyuan and Guan, Bo and Ma, Liang and Tian, Hanchen and Liu, Xingbo} } @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 {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 {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 {1079, title = {A photochemical diode artificial photosynthesis system for unassisted high efficiency overall pure water splitting}, journal = {Nature Communications}, volume = {9}, year = {2018}, pages = {1707}, issn = {2041-1723}, doi = {10.1038/s41467-018-04067-1}, url = {https://www.nature.com/articles/s41467-018-04067-1}, author = {Faqrul A. Chowdhury and Michel L. Trudeau and Hong Guo and Zetian Mi} } @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 {823, title = {A novel CeO2{\textendash}xSnO2/Ce2Sn2O7 pyrochlore cycle for enhanced solar thermochemical water splitting}, journal = {AIChE Journal}, volume = {63}, 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 = {3450-3462}, abstract = {Published in August 2017.}, issn = {00011541}, doi = {10.1002/aic.15701}, url = {http://doi.wiley.com/10.1002/aic.15701}, author = {Chongyan Ruan and Yuan Tan and Lin Li and Junhu Wang and Xiaoyan Liu and Xiaodong Wang} } @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 {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 {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} } @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 {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 {961, title = {Reduction enthalpy and charge distribution of substituted ferrites and doped ceria for thermochemical water and carbon dioxide splitting with DFT+U}, journal = {Phys. Chem. Chem. Phys.}, volume = {18}, 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 = {23587-23595}, issn = {1463-9076, 1463-9084}, doi = {10.1039/C6CP05073E}, url = {http://xlink.rsc.org/?DOI=C6CP05073E}, author = {D. A. Dimitrakis and N. I. Tsongidis and A. G. Konstandopoulos} } @article {773, title = {X-ray absorption study of ceria nanorods promoting the disproportionation of hydrogen peroxide}, journal = {ChemComm}, volume = {52}, 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 = {5003-5006}, abstract = {A quasi in situ X-ray absorption study demonstrated that the disproportionation of hydrogen peroxide (H2O2) promoted by ceria nanorods was associated with a reversible Ce3+/Ce4+ reaction and structural transformations in ceria. The direction of this reversible reaction was postulated to depend on the H2O2 concentration and the fraction of Ce3+ species in ceria nanorods.}, doi = {10.1039/c5cc10643e}, author = {Wu Tai-Sing and Zhou Yunyun and Sabirianov Renat and Mei Wai-Ning and Soo Yun-Liang and Cheung Chin} } @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 {941, title = {Nonstoichiometric perovskite oxides for solar thermochemical H2 and CO production}, 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 = {2009-2018}, issn = {18766102}, doi = {10.1016/j.egypro.2014.03.213}, url = {http://linkinghub.elsevier.com/retrieve/pii/S1876610214006675}, author = {A.H. McDaniel and A. Ambrosini and E.N. Coker and J.E. Miller and W.C. Chueh and R. O{\textquoteright}Hayre and J. Tong} } @article {917, title = {Sr- and Mn-doped LaAlO3-δ for solar thermochemical H2 and CO production}, 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 = {2424-2428}, issn = {1754-5692}, doi = {10.1039/C3EE41372A}, url = {http://dx.doi.org/10.1039/C3EE41372A}, author = {Anthony H. McDaniel and Elizabeth C. Miller and Darwin Arifin and Andrea Ambrosini and Eric N. Coker and Ryan O{\textquoteright}Hayre and William C. Chueh and Jianhua Tong} } @article {867, title = {Direct solar reduction of CO2 to fuel: First prototype results}, journal = {Industrial \& engineering chemistry research}, volume = {41}, year = {2002}, 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 = {1935{\textendash}1939}, url = {http://pubs.acs.org/doi/abs/10.1021/ie010871x}, author = {Ann J. Traynor and Reed J. Jensen} } @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 {775, title = {Effect of local coordination of Mn on Mn-L-2,L-3 edge electron energy loss spectrum}, journal = {JOURNAL OF APPLIED PHYSICS}, volume = {114}, 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 = {054906}, abstract = {The effects of the local coordination environment of Mn ions in perovskite manganese oxides on the Mn-L-2,L-3 edge electron energy loss (EEL) spectra was experimentally and theoretically investigated. The Mn-L-2,L-3 edge EEL spectra were observed for various perovskite manganese oxides, including YMnO3, LaMnO3, BaMnO3, SrMnO3, and CaMnO3, in which the Mn ions have different valence states and local coordination. The experiment revealed that the Mn L-3/L-2 ratio is influenced not only by the valence state but also by the local environment of the Mn ions. Furthermore, compared to the Mn-L-3/L-2 ratios of Mn3+ compounds, the Mn L-3/L-2 ratios of the Mn4+ compounds are found to be much more sensitive to local distortions. The ab-initio multiplet calculation of the Mn-L-2,L-3 edge EEL spectra revealed that the effects of local coordination on the spectral features are dependent on the local electronic structures of the Mn ions. These findings indicate that the valence state as well as the local environments of the Mn ions can be unraveled by combining experimental and theoretical investigations of Mn-L-2,L-3 edge EEL spectra. (C) 2013 AIP Publishing LLC.}, issn = {0021-8979}, doi = {10.1063/1.4817425}, author = {S Nishida and S Kobayashi and A Kumamoto and H Ikeno and T Mizoguchi and I Tanaka and Y Ikuhara and T Yamamoto} } @article {754, title = {Effects of the Incorporation of Sc2O3 into CeO2{\textendash}ZrO2 Solid Solution: Structural Characterization and in Situ XANES/TPR Study under H2 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 = {24165-24175}, abstract = {Nanostructured CeO2-rich samples cosubstituted with ZrO2 and Sc2O3 are studied. The effects of the combined additions of both oxides on structural, morphological, and, especially, redox properties of the substituted lattice are assessed. In situ near edge X-ray absorption (XANES) experiments with synchrotron light were performed to study oxygen exchange capacity in a reducing environment for these ternary oxides. Structural characterization revealed that up to 8 at. \% Sc was successfully incorporated into the CeO2{\textendash}ZrO2 lattice without phase segregation. Increased scandia solubility was achieved through a soft chemical route synthesis involving citrate complexation which gave rise to porous powders with crystallite sizes in the nanometer range. In situ XANES experiments in 5 mol \% H2/He atmosphere demonstrated that adding Sc3+ to the CeO2{\textendash}ZrO2 mixed oxide leads to a ternary system (Ce0.9ScxZr0.1{\textendash}xO2-δ) with faster reduction kinetics and enhanced reducibility in the whole temperature range analyzed (25{\textendash}800 {\textdegree}C) compared to both binary materials: Ce0.9Zr0.1O2 and Ce0.9Sc0.1O1.95.}, issn = {1932-7447}, doi = {10.1021/acs.jpcc.6b07847}, url = {https://doi.org/10.1021/acs.jpcc.6b07847}, author = {Luc{\'\i}a M. Toscani and Aldo F. Craievich and M{\'a}rcia C. A. Fantini and Diego G. Lamas and Susana A. Larrondo} } @article {1026, title = {Electrocatalysis in water electrolysis with solid polymer electrolyte}, journal = {Electrochimica Acta}, volume = {48}, 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 = {3945-3952}, abstract = {Powders of IrO2 were used as anode catalysts in water electrolysis cells with solid polymer electrolyte (SPE). The catalyst was prepared by a pyrolysis process in a nitrate melt at 340{\textdegree}C and then annealed at different temperatures from 440 to 540{\textdegree}C. The catalyst materials were applied to an electrode membrane assembly (MEA) and studied in situ in an electrolysis cell using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and stationary current density{\textendash}potential relations. The impedance results clearly show that the non-annealed material possesses the highest electrocatalytic activity and that this activity deteriorates with increasing annealing temperature. The electrical conductivity, however, increases by increasing annealing temperature. Optimum annealing conditions were found at 490{\textdegree}C, where the total polarisation reaches a minimum in the high current density range (1{\textendash}2 A cm-2), at the actual conditions. Increased crystallinity and size of the particles with increasing annealing temperature was observed by transmission electron microscopy (TEM). A very high electrochemical performance was obtained in a water electrolysis cell using IrO2 on the anode side and Pt on Vulcan XC-72 on the cathode side, corresponding to a current density of 1 A cm-2 at 1.60 V.}, issn = {0013-4686}, doi = {10.1016/j.electacta.2003.04.001}, url = {http://www.sciencedirect.com/science/article/pii/S0013468603005334}, author = {Egil Rasten and Georg Hagen and Reidar Tunold} } @article {1016, title = {Evaluation of nitrided titanium separator plates for proton exchange membrane electrolyzer cells}, journal = {Journal of Power Sources}, volume = {272}, 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 = {954-960}, abstract = {Proton exchanges membrane (PEM) regenerative fuel cell electrolysis of water is of great recent interest as a hydrogen generation technology. Anode side titanium current collectors and separator plates used in these applications typically employ coatings of platinum group metals to achieve durability and performance requirements in the high voltage, oxidizing environment. The present work assessed the potential for lower cost surface modified titanium by both thermal (gas) nitridation and plasma nitridation approaches. The nitrided Ti was found to result in far less hydrogen uptake in coupon testing than did Pt-plated Ti. Short-term (48~h) single-cell performance at 25~{\textdegree}C was approximately 13\% better (lower voltage) at 1.2~A~cm-2 for thermal and plasma nitrided plates vs. untreated Ti. However, at 50~{\textdegree}C and 1.5~A~cm-2, the thermally nitrided plate exhibited only on the order of 3\% better behavior (lower voltage) compared to the untreated Ti and plasma nitrided Ti. Durability testing for 500~h resulted in only a minor degradation in cell performance, on the order of 1{\textendash}2\% voltage increase, with the best behavior exhibited by the thermally nitrided Ti plate. Despite their relatively stable cell performance, extensive local oxidation of the thermally nitrided and plasma nitrided flow field regions was observed.}, issn = {0378-7753}, doi = {10.1016/j.jpowsour.2014.09.016}, url = {http://www.sciencedirect.com/science/article/pii/S0378775314014220}, author = {Todd J. Toops and Michael P. Brady and Feng-Yuan Zhang and Harry M. Meyer and Katherine Ayers and Andrew Roemer and Luke Dalton} } @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 {1007, title = {Methods of photoelectrode characterization with high spatial and temporal resolution}, journal = {Energy \& Environmental Science}, 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 = {2863-2885}, abstract = {Materials and photoelectrode architectures that are highly efficient, extremely stable, and made from low cost materials are required for commercially viable photoelectrochemical (PEC) water-splitting technology. A key challenge is the heterogeneous nature of real-world materials, which often possess spatial variation in their crystal structure, morphology, and/or composition at the nano-, micro-, or macro-scale. Different structures and compositions can have vastly different properties and can therefore strongly influence the overall performance of the photoelectrode through complex structure{\textendash}property relationships. A complete understanding of photoelectrode materials would also involve elucidation of processes such as carrier collection and electrochemical charge transfer that occur at very fast time scales. We present herein an overview of a broad suite of experimental and computational tools that can be used to define the structure{\textendash}property relationships of photoelectrode materials at small dimensions and on fast time scales. A major focus is on in situ scanning-probe measurement (SPM) techniques that possess the ability to measure differences in optical, electronic, catalytic, and physical properties with nano- or micro-scale spatial resolution. In situ ultrafast spectroscopic techniques, used to probe carrier dynamics involved with processes such as carrier generation, recombination, and interfacial charge transport, are also discussed. Complementing all of these experimental techniques are computational atomistic modeling tools, which can be invaluable for interpreting experimental results, aiding in materials discovery, and interrogating PEC processes at length and time scales not currently accessible by experiment. In addition to reviewing the basic capabilities of these experimental and computational techniques, we highlight key opportunities and limitations of applying these tools for the development of PEC materials.}, issn = {1754-5706}, doi = {10.1039/C5EE00835B}, url = {http://pubs.rsc.org/en/content/articlelanding/2015/ee/c5ee00835b}, author = {Daniel V. Esposito and Jason B. Baxter and Jimmy John and Nathan S. Lewis and Thomas P. Moffat and Tadashi Ogitsu and Glen D. O{\textquoteright}Neil and Tuan Anh Pham and A. Alec Talin and Jesus M. Velazquez and Brandon C. Wood} } @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 {784, title = {Oxidation state and chemical shift investigation in transition metal oxides by EELS}, journal = {Ultramicroscopy}, volume = {116}, 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 = {24-33}, issn = {03043991}, doi = {10.1016/j.ultramic.2012.03.002}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0304399112000381}, author = {Haiyan Tan and Jo Verbeeck and Artem Abakumov and Gustaaf Van Tendeloo} } @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 {890, title = {Reactive ceramics of CeO2{\textendash}MOx (M=Mn, Fe, Ni, Cu) for H2 generation by two-step water splitting using concentrated solar thermal energy}, journal = {Energy}, volume = {32}, 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 = {656-663}, issn = {03605442}, doi = {10.1016/j.energy.2006.05.002}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0360544206001186}, author = {H Kaneko and T Miura and H Ishihara and S Taku and T Yokoyama and H Nakajima and Y Tamaura} } @article {761, title = {Resonant X-ray scattering as a probe of the valence and magnetic ground state and excitations in Pr0.6Ca0.4MnO3}, journal = {Physica B: Condensed Matter}, volume = {345}, 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 = {6-10}, issn = {09214526}, doi = {10.1016/j.physb.2003.11.008}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0921452603010020}, author = {S. Grenier and K.J. Thomas and Young-June Kim and J.P. Hill and Doon Gibbs and V. Kiryukhin and Y. Tokura and Y. Tomioka and D. Casa and T. Gog and C. Venkataraman} } @article {1004, title = {Solar-to-hydrogen efficiency: shining light on photoelectrochemical device performance}, journal = {Energy \& Environmental Science}, 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 = {74-80}, abstract = {Illumination characteristics from artificial sources strongly influence the experimental performance of solar water-splitting devices, with the highest impact on tandem structures designed for optimum conversion efficiency. We highlight quantitative and qualitative flaws of common characterization techniques, discuss their impact on research results and strategy, and demonstrate approaches toward advanced measurement accuracy.}, issn = {1754-5706}, doi = {10.1039/C5EE03206G}, url = {http://pubs.rsc.org/en/content/articlelanding/2016/ee/c5ee03206g}, author = {H. D{\"o}scher and J. L. Young and J. F. Geisz and J. A. Turner and T. G. Deutsch} } @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 {780, title = {Surface Defect Chemistry and Electronic Structure of Pr 0.1 Ce 0.9 O 2-δ Revealed in Operando}, journal = {Chemistry of Materials}, volume = {30}, 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 = {2600-2606}, issn = {0897-4756, 1520-5002}, doi = {10.1021/acs.chemmater.7b05129}, url = {http://pubs.acs.org/doi/10.1021/acs.chemmater.7b05129}, author = {Qiyang Lu and Gulin Vardar and Maximilian Jansen and Sean R. Bishop and Iradwikanari Waluyo and Harry L. Tuller and Bilge Yildiz} } @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 {781, title = {Three Oxidation States of Manganese in the Barium Hexaferrite BaFe 12{\textendash} x Mn x O 19}, journal = {Inorganic Chemistry}, volume = {56}, 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 = {3861-3866}, issn = {0020-1669, 1520-510X}, doi = {10.1021/acs.inorgchem.6b02688}, url = {http://pubs.acs.org/doi/10.1021/acs.inorgchem.6b02688}, author = {Sandra Nemrava and Denis A. Vinnik and Zhiwei Hu and Martin Valldor and Chang-Yang Kuo and Dmitry A. Zherebtsov and Svetlana A. Gudkova and Chien-Te Chen and Liu Hao Tjeng and Rainer Niewa} } @article {834, title = {Understanding Chemical Expansion in Non-Stoichiometric Oxides: Ceria and Zirconia Case Studies}, journal = {Advanced Functional Materials}, 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 = {1958-1965}, issn = {1616301X}, doi = {10.1002/adfm.201102648}, url = {http://doi.wiley.com/10.1002/adfm.201102648}, author = {Dario Marrocchelli and Sean R. Bishop and Harry L. Tuller and Bilge Yildiz} } @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 {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} }