@article {1132,
	title = {A Computational Framework to Accelerate the Discovery of Perovskites for Solar Thermochemical Hydrogen Production: Identification of Gd Perovskite Oxide Redox Mediators},
	journal = {Advanced Functional Materials},
	year = {2022},
	pages = {2200201},
	abstract = {A high-throughput computational framework to identify novel multinary perovskite redox mediators is presented, and this framework is applied to discover the Gd-containing perovskite oxide compositions Gd2BB'O6, GdA'B2O6, and GdA'BB'O6 that split water. The computational scheme uses a sequence of empirical approaches to evaluate the stabilities, electronic properties, and oxygen vacancy thermodynamics of these materials, including contributions to the enthalpies and entropies of reduction, ΔHTR and ΔSTR. This scheme uses the machine-learned descriptor τ to identify compositions that are likely stable as perovskites, the bond valence method to estimate the magnitude and phase of BO6 octahedral tilting and provide accurate initial estimates of perovskite geometries, and density functional theory including magnetic- and defect-sampling to predict STCH-relevant properties. Eighty-three promising STCH candidate perovskite oxides down-selected from 4392 Gd-containing compositions are reported, three of which are referred to experimental collaborators for characterization and exhibit STCH activity. The results demonstrate that the high-throughput computational scheme described herein{\textemdash}which is used to evaluate Gd-containing compositions but can be applied to any multinary perovskite oxide compositional space(s) of interest{\textemdash}accelerates the discovery of novel STCH active redox mediators with reasonable computational expense.},
	keywords = {concentrated solar energy, density functional theory, hydrogen, Perovskite, thermochemical water splitting},
	doi = {https://doi.org/10.1002/adfm.202200201},
	url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/adfm.202200201},
	author = {Bare, Zachary J. L. and Morelock, Ryan J. and Musgrave, Charles B.}
}
@article {1139,
	title = {Electrode optimization for efficient hydrogen production using an SO2-depolarized electrolysis cell},
	journal = {International Journal of Hydrogen Energy},
	volume = {47},
	year = {2022},
	pages = {14180-14185},
	abstract = {The hybrid sulfur (HyS) cycle offers an alternative route to hydrogen and sulfuric acid production using the SO2-depolarized electrolysis (SDE) cell. This work reports the most efficient SDE operation to date at high sulfuric acid concentrations (\~{}60~wt\%) achieved through the optimization of operating conditions and cell components. We observed that open porosity in the porous transport media (PTM) plays a significant role in SDE performance as it enables efficient acid removal from the catalyst layer. The combination of membrane electrode assembly (MEA) components, such as Sulfonated Diels Alder Poly (phenylene) (SDAPP) membranes and electrodes prepared using SGL 29BC PTM, and operating conditions (103.4 kPagauge at 125~{\textdegree}C) yielded electrolysis potentials <700~mV at 500~mA/cm2 and acid concentrations >60~wt\%.},
	keywords = {Catalysis, electrolysis, High pressure, Hybrid sulfur cycle, Hydrogen generation, Sulfur dioxide},
	issn = {0360-3199},
	doi = {https://doi.org/10.1016/j.ijhydene.2022.02.166},
	url = {https://www.sciencedirect.com/science/article/pii/S0360319922007807},
	author = {H{\'e}ctor R. Col{\'o}n-Mercado and Scott A. Mauger and Maximilian B. Gorensek and Cy H. Fujimoto and Aaron A. Lando and Prabhu Ganesan and Benjamin H. Meekins and Noah D. Meeks}
}
@article {1141,
	title = {High-performance SO2-depolarized electrolysis cell using advanced polymer electrolyte membranes},
	journal = {International Journal of Hydrogen Energy},
	volume = {47},
	year = {2022},
	pages = {57-68},
	abstract = {Three different proton conducting polymeric membrane materials (Nafion{\textregistered} 115, Nafion{\textregistered} 212, and sulfonated Diels-Alder polyphenylene [SDAPP]) were evaluated for use in SO2-depolarized electrolyzers for the production of hydrogen via the hybrid sulfur cycle. Their performance was measured using different water feed strategies to minimize overpotential losses while maintaining high product acid concentration. Both thin membranes (Nafion{\textregistered} 212 and SDAPP) showed performance superior to that of the thicker Nafion{\textregistered} 115. The SDAPP membrane electrode assembly (MEA) performed well at higher acid concentrations, maintaining low ohmic and kinetic overpotentials. Finally, short-term (100-h) stability tests under constant current conditions showed minimal degradation for the SDAPP and Nafion{\textregistered} 212 MEAs. SDAPP MEA performance approached the targets needed to make the hybrid sulfur cycle a competitive process for hydrogen production (product acid concentration >=65~wt\% H2SO4 at~<=~0.6-V cell potential and >=0.5 A-cm-2 current density).},
	keywords = {Hybrid sulfur (HyS) process, Hydrogen production, Sulfonated diels-alder polyphenylene (SDAPP), Sulfur dioxide-depolarized electrolyzer (SDE), Sulfuric acid production},
	issn = {0360-3199},
	doi = {https://doi.org/10.1016/j.ijhydene.2021.10.019},
	url = {https://www.sciencedirect.com/science/article/pii/S0360319921039343},
	author = {H{\'e}ctor R. Col{\'o}n-Mercado and Maximilian B. Gorensek and Cy H. Fujimoto and Aaron A. Lando and Benjamin H. Meekins}
}
@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 {1147,
	title = {Redox Defect Thermochemistry of FeAl2O4 Hercynite in Water Splitting from First-Principles Methods},
	journal = {Chemistry of Materials},
	volume = {34},
	year = {2022},
	pages = {519-528},
	keywords = {concentrated solar, Hercynite, hydrogen lcroduction, Perovskite, Redox Defect, screening, thermochemistry, thermogravimetry, water splitting},
	doi = {10.1021/acs.chemmater.1c01049},
	url = {https://doi.org/10.1021/acs.chemmater.1c01049},
	author = {Millican, Samantha L. and Clary, Jacob M. and Musgrave, Charles B. and Lany, Stephan}
}
@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 {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 {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 {1151,
	title = {A comprehensive modeling method for proton exchange membrane electrolyzer development},
	journal = {International Journal of Hydrogen Energy},
	volume = {46},
	year = {2021},
	note = {Special issue on the 2nd International Symposium on Hydrogen Energy and Energy Technologies (HEET 2019)},
	pages = {17627-17643},
	abstract = {Hydrogen attracts significant interests as an effective energy carrier that can be derived from renewable sources. Hydrogen production using a proton-exchange membrane (PEM) electrolyzer can efficiently convert renewable power via water splitting in wide scales{\textemdash}from large, centralized generation to on-site production. Mathematical models with multiple scales and fidelities facilitate the continuing improvements of PEM electrolyzer development to improve performance, cost, and reliability. The model scopes and methods are presented in this paper, which also introduces a comprehensive PEM electrolysis modeling tool based on computational fluid dynamics (CFD) software, ANSYS/Fluent. The modeling tool incorporates electrochemical model of a PEM electrolysis cell to simulate the performance of coupled thermal-fluid, species transport, and electrochemical processes in a product-scale cell or stack by leveraging the powerful meshing generation and CFD solver of ANSYS/Fluent. The thermal-fluid modeling includes liquid water/gas two-phase flow and simulates a PEM electrolysis cell by using Fluent user-defined functions as add-on modules accounting for PEM-specific species transport and electrochemical processes. The modeling outcomes expediate PEM electrolyzer scaling up from basic material development and laboratory testing.},
	keywords = {Electrochemical modeling, Hydrogen production, Low temperature electrolysis water splitting, Proton exchange membrane electrolysis cell},
	issn = {0360-3199},
	doi = {https://doi.org/10.1016/j.ijhydene.2021.02.170},
	url = {https://www.sciencedirect.com/science/article/pii/S0360319921007448},
	author = {Zhiwen Ma and Liam Witteman and Jacob A. Wrubel and Guido Bender}
}
@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 {1157,
	title = {Hydrogen: Targeting \textdollar1/kg in 1 Decade},
	journal = {The Electrochemical Society Interface},
	volume = {30},
	year = {2021},
	month = {12/2021},
	pages = {61{\textendash}66},
	abstract = {The societal energy system is evolving rapidly as the impacts of our existing energy system are better appreciated and technological advances have dramatically decreased the cost of renewable resources. Simultaneously, the importance of energy transfer across timeframes and the difficulty of decarbonizing the industrial loads and transportation demands using electricity are being recognized. At the center of this need is achieving low-cost clean hydrogen. The U.S. Department of Energy launched the Hydrogen Energy EarthShot which seeks to reduce the cost of clean hydrogen to $1 per 1 kilogram in one decade. Reaching the $1/kg goal is dependent on the evolution of the electrical energy system to increase renewable energy deployment and low electricity costs; advances in electrolysis technology and manufacturing readiness; and infrastructure build-out and hydrogen market establishment that results in the ability to make, move, store, and use clean hydrogen economically while spurring job creation.},
	keywords = {Clean hydrogen, decarbonizing, electrolysis, energy storage, energy transfer, hydrogen market, hydrogen shot},
	doi = {10.1149/2.f15214if},
	url = {https://doi.org/10.1149/2.f15214if},
	author = {Bryan S. Pivovar and Mark F. Ruth and Deborah J. Myers and Huyen N. Dinh}
}
@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 {1152,
	title = {A mini-review on proton conduction of BaZrO 3 -based perovskite electrolytes},
	journal = {Journal of Physics: Energy},
	volume = {3},
	year = {2021},
	month = {07},
	pages = {032019},
	keywords = {ceramics, dopant, electrolyte, electrolytic cell, energy conversion, fuel cell, hydration, interaction, mobility, oxide, proton, proton conduction},
	doi = {10.1088/2515-7655/ac12ab},
	author = {Vera, Clarita and Ding, Hanping and Peterson, David and Gibbons, William and Zhou, Meng and Ding, Dong}
}
@article {1127,
	title = {CeTi2O6{\textemdash}A Promising Oxide for Solar Thermochemical Hydrogen Production},
	journal = {ACS Applied Materials \& Interfaces},
	volume = {12},
	year = {2020},
	pages = {21521-21527},
	keywords = {brannerite structure, Cerium based oxides, CeTi2O6, high thermal stability, large entropy of reduction, small reduction enthalpy},
	doi = {CeTi2O6{\textemdash}A Promising Oxide for Solar Thermochemical Hydrogen Production},
	author = {S. S. Naghavi and J. He and C. Wolverton}
}
@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 {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 {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 {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 {1181,
	title = {Advancement of Proton-Conducting Solid Oxide Fuel Cells and Solid Oxide Electrolysis Cells at Idaho National Laboratory (INL)},
	journal = {ECS Transactions},
	volume = {91},
	year = {2019},
	month = {07/2019},
	pages = {1029{\textendash}1034},
	abstract = {Proton conducting ceramics have been considered as a strategic material system used in solid oxide fuel cells and solid oxide electrolysis cells for electricity generation and hydrogen production. The high proton conductivity of protonic electrolyte and rapid development of robust electrode materials have significantly promoted the reduction of feasible operating temperature to intermediate temperature range (400 600 {\textdegree}C), which can attribute to favorable technical and economic advantages when they are compared with conventional oxide-ion conducting electrolyte based solid oxide cell system. In the past few years, Idaho National Laboratory has been devoted to developing advanced electrolyte and electrode materials R\&D, diverse manufacturing capability, and expanding evaluation facility for these applications, aiming to further improve performance, stability and manufacturing cost. There are some remarkable accomplishments achieved on electrode engineering, electrolyte optimization, new material down-selection and large-scale cell fabrication in Idaho National Laboratory.},
	keywords = {BCZYYb7111, HTE, NiO-BaCe0.7Zr0.1Y0.1Yb0.1O3, PrBa0.5Sr0.5Co1.5Fe0.5O3, Protonic conductor, SOEC},
	doi = {10.1149/09101.1029ecst},
	url = {https://doi.org/10.1149/09101.1029ecst},
	author = {Hanping Ding and Wei Wu and Dong Ding}
}
@article {1182,
	title = {Conditions for stable operation of solid oxide electrolysis cells: oxygen electrode effects},
	journal = {Energy Environ. Sci.},
	volume = {12},
	year = {2019},
	pages = {3053-3062},
	abstract = {Solid oxide electrolysis cells (SOECs) convert renewable electricity to fuels with efficiency substantially higher than other electrolysis technologies. However, questions remain regarding degradation mechanisms that limit SOEC long-term stability. One of the key degradation mechanisms is oxygen electrode delamination; although prior studies have improved the understanding of this mechanism, it is still difficult to predict how degradation depends on SOEC materials and operating conditions, i.e., temperature, voltage, and current density. Here we present a study aimed at developing a quantitative understanding of oxygen electrode delamination. Experimentally, a life test study of symmetric and full cells with yttria-stabilized zirconia (YSZ) electrolytes and Gd-doped ceria (GDC) barrier layers was done with three different perovskite oxygen electrode materials. Fracture was observed at the perovskite{\textendash}GDC interface above a critical current density and below a critical operating temperature. A theory is presented that combines a calculation of the effective oxygen pressure across the electrolyte with an estimation of the pressure required for fracture. Fracture is correctly predicted for a critical oxygen partial pressure of \~{}7200 atm and an associated electrode overpotential of \~{}0.2 V, occurring at the electrode/GDC interface because of the relatively low perovskite fracture toughness. Damage at the GDC/YSZ interface was also observed in some cases and explained by a peak in the oxygen pressure at this interface.},
	keywords = {Gd-doped ceria, HTE, Perovskite, SOEC, Yttria-stabilized zirconia},
	doi = {10.1039/C9EE01664C},
	url = {http://dx.doi.org/10.1039/C9EE01664C},
	author = {Park, Beom-Kyeong and Zhang, Qian and Voorhees, Peter W. and Barnett, Scott A.}
}
@article {1184,
	title = {Effect of direct-current operation on the electrochemical performance and structural evolution of Ni-YSZ electrodes},
	journal = {Journal of Physics: Energy},
	volume = {2},
	year = {2019},
	month = {12/2019},
	pages = {014006},
	abstract = {The effect of electrolysis operations on Ni-YSZ fuel electrode stability was studied at different current densities and fuel mixtures during 1000 h life tests. For a typical electrolysis mixture of 50\% H2/50\% H2O and 0.6 A cm-2 current density, cell ohmic resistance values were reasonably stable and no structural changes occurred. However, for more reducing conditions (97\% H2/3\% H2O), increasing the current density above 0.4 A cm-2 increased the ohmic resistance accompanied by significant electrolyte degradation including fracture and void formation at grain boundaries. Numerical analysis was carried out to determine the effective oxygen partial pressure across the electrolyte. The results show that the oxygen partial pressure values at high current density and low steam content may be low enough to reduce zirconia to form a Ni-Zr alloy product, initiating the observed electrolyte structural degradation.},
	keywords = {durability, HTE, SOEC, Yttria-stabilized zirconia},
	doi = {10.1088/2515-7655/ab59a6},
	url = {https://doi.org/10.1088/2515-7655/ab59a6},
	author = {Qinyuan Liu and Qian Zhang and Peter W Voorhees and Scott A Barnett}
}
@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 {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 {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 {1195,
	title = {High performing triple-conductive Pr2NiO4+δ anode for proton-conducting steam solid oxide electrolysis cell },
	journal = {Journal of Materials Chemistry A},
	volume = {6},
	year = {2018},
	pages = {18057-18066},
	abstract = {The development of proton-conducting solid oxide electrolysis cells for the intermediate-temperature range application is largely hindered by the limited choice of adequate anode materials. In this study, the popular solid oxide fuel cell cathode material Pr2NiO4+δ (PNO) is investigated as the anode for the electrolysis cell, considering its proton-conducting ability. The introduction of protons into the PNO lattice is confirmed through insertion-induced conductivity variation measurements. Good chemical compatibility is verified between PNO and BaZr0.2Ce0.6Y0.2O3-δ (BZCY) proton-conducting electrolyte. Excellent catalytic activity towards water splitting is observed for the PNO{\textendash}BZCY composite anode, 0.52 Ω cm2 for 550 {\textdegree}C, 0.057 Ω cm2 for 700 {\textdegree}C. The water-splitting process is disclosed by impedance spectroscopy measured under different conditions. Due to proton conduction in PNO, the PNO surface is activated for electrochemical reactions. The non-charge transfer processes account little to the electrode resistance. The performance of the PNO{\textendash}BZCY anode is determined by two charge transfer processes whose kinetics are governed the electrolyzing potential. This charge transfer-limiting nature is relatively benign since the electrode resistance has been found to exponentially reduce with increasing overpotential. Cathode-supported Ni{\textendash}BZCY//BZCY//PNO{\textendash}BZCY thin film electrolyte single cells are fabricated and characterized. \~{}95\% current efficiency is confirmed. At 700 {\textdegree}C, a current density of 977 mA cm-2 is achieved at a 1.3 V electrolyzing potential, e.g. 0.37 V overpotential, which is one of the best performances of proton-conducting steam electrolysis cells so far. The PNO{\textendash}BZCY anode accounts only for 16\% of the overall polarization resistance at 700 {\textdegree}C. These findings prove that the triple-conductive PNO is a promising anode material for proton-based steam electrolysis cells.},
	keywords = {BaZr0.2Ce0.6Y0.2O3-δ, HTE, Pr2NiO4+δ, Protonic ceramic electrolysis cells, SOEC},
	doi = {10.1039/C8TA04018D},
	url = {http://dx.doi.org/10.1039/C8TA04018D},
	author = {Li, Wenyuan and Guan, Bo and Ma, Liang and Hu, Shanshan and Zhang, Nan and Liu, Xingbo}
}
