@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 {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 {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 {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 {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 {1114, title = {Computationally Accelerated Discovery and Experimental Demonstration of Gd0.5La0.5Co0.5Fe0.5O3 for Solar Thermochemical Hydrogen Production}, journal = {Frontiers in Energy Research}, volume = {9}, year = {2021}, doi = {https://doi.org/10.3389/fenrg.2021.750600}, author = {J. E. Park and Z. J. L. Bare and R. J. Morelock and M. A. Rodriguez and A. Ambrosini and C. B. Musgrave and A. H. McDaniel and E. N. Coker} } @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 {1154, title = {Effect of Nanoscale Ce0.8Gd0.2O2-δ Infiltrant and Steam Content on Ni{\textendash}(Y2O3)0.08(ZrO2)0.92 Fuel Electrode Degradation during High-Temperature Electrolysis}, journal = {Nano Letters}, volume = {21}, year = {2021}, note = {PMID: 34606281}, pages = {8363-8369}, keywords = {degredation, duel electrode, infiltration, solid oxide electrolysis cell}, doi = {10.1021/acs.nanolett.1c02937}, url = {https://doi.org/10.1021/acs.nanolett.1c02937}, author = {Park, Beom-Kyeong and Cox, Dalton and Barnett, Scott A.} } @article {1117, title = {Factors Governing Oxygen Vacancy Formation in Oxide Perovskites}, journal = {Journal of the American Chemical Society}, volume = {143}, year = {2021}, pages = {13212-13227}, doi = {ttps://doi.org/10.1021/jacs.1c05570}, author = {R. B. Wexler and G. S. Gautam and E. B. Stechel and E. A. Carter} } @article {1160, title = {Modeling Electrokinetics of Oxygen Electrodes in Solid Oxide Electrolyzer Cells}, journal = {Journal of The Electrochemical Society}, volume = {168}, year = {2021}, month = {11/2021}, pages = {114510}, abstract = {A microscale model is presented in this study to simulate electrode kinetics of the oxygen electrode in a solid oxide electrolyzer cell (SOEC). Two mixed ionic/electronic conducting structures are examined for the oxygen producing electrode in this work: single layer porous lanthanum strontium cobalt ferrite (LSCF), and bilayer LSCF/SCT (strontium cobalt tantalum oxide) structures. A yttrium-stabilized zirconia (YSZ) electrolyte separates the hydrogen and oxygen electrodes, as well as a gadolinium doped-ceria (GDC) buffer layer on the oxygen electrode side. Electrochemical reactions occurring at the two-phase boundaries (2PBs) and three-phase boundaries (3PBs) of single-layer LSCF and bilayer LSCF/SCT oxygen electrodes are modeled under various SOEC voltages with lattice oxygen stoichiometry as the key output. The results reveal that there exists a competition in electrode kinetics between 2PBs and 3PBs, but 3PBs are the primary reactive sites for single-layer LSCF oxygen electrode under high voltages. These locations experience the greatest oxygen stoichiometry variations and are therefore the most likely locations for dimensional changes. By applying an active SCT layer over LSCF, the 2PBs become activated to compete with the 3PBs, thus alleviating oxygen stoichiometry variations and reducing the likelihood of dimensional change. This strategy could reduce lattice structural expansion, proving to be valuable for electrode-electrolyte delamination prevention and will be the focus of future work.}, keywords = {Barium zirconate, Defect transport, electrode-electrolyte delamination prevention, Faradaic efficiency, lattice oxygen stoichiometry, microscale model, o-SOEC, oxygen electrode, solid oxide electrolyzer cell}, doi = {10.1149/1945-7111/ac35fc}, url = {https://doi.org/10.1149/1945-7111/ac35fc}, author = {Korey Cook and Jacob Wrubel and Zhiwen Ma and Kevin Huang and Xinfang Jin} } @article {1113, title = {Performance and Durability of Anion Exchange Membrane Water Electrolyzers Using Down-Selected Polymer Electrolytes}, journal = {Journal of Materials Chemistry A}, year = {2021}, pages = {22670-22683}, doi = {https://doi.org/10.1039/D1TA06869E}, author = {A. R. Motz and D. Li and A. Keane and L. D. Manriquez and E. J. Park and S. Maurya and H. Chung and C. Fujimoto and J. Jeon and M. K. Pagels and C. Bae and K. E. Ayers and Y. S. Kim} } @article {1116, title = {Performance and Limits of 2.0 eV Bandgap CuInGaS2 Solar Absorber Integrated With CdS Buffer on F:SnO2 Substrate for Multijunction Photovoltaic and Photoelectrochemical Water Splitting Devices}, volume = {2}, year = {2021}, pages = {5752-5763}, doi = {https://doi.org/10.1039/D1MA00570G}, author = {N. Gaillard and W. Septina and J. Varley and T. Ogitsu and K. K. Ohtaki and H. A. Ishii and J. P. Bradley and C. Muzzillo and K. Zhu and F. Babbe and J. Cooper} } @article {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 {1171, title = {Enhancement of Ni-(Y2O3)0.08(ZrO2)0.92 fuel electrode performance by infiltration of Ce0.8Gd0.2O2-: δ nanoparticles}, journal = {Journal of Materials Chemistry A}, volume = {8}, year = {2020}, note = {Funding Information: The authors gratefully acknowledge research support from the HydroGEN Advanced Water Splitting Materials Consortium, established as part of the Energy Materials Network under the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Fuel Cell Technologies Office, under Award Number DE-0008079. The electrochemical modeling work was supported nancially by the Department of Energy National Energy Technology Laboratory under Prime Award Number DE-FE0027584 to FuelCell Energy, Inc., and under Subaward to Northwestern University. Some of the microstructural characterization was supported by National Science Foundation grants DMR-1506925 and DMR-1912530. Publisher Copyright: {\textcopyright} 2020 The Royal Society of Chemistry.}, pages = {4099{\textendash}4106}, abstract = {This paper addresses the use of Ce0.8Gd0.2O2-δ (GDC) infiltration into the Ni-(Y2O3)0.08(ZrO2)0.92 (YSZ) fuel electrode of solid oxide cells (SOCs) for improving their electrochemical performance in fuel cell and electrolysis operation. Although doped ceria infiltration into Ni-YSZ has recently been shown to improve the electrode performance and stability, the mechanisms defining how GDC impacts electrochemical characteristics are not fully delineated. Furthermore, the electrochemical characteristics have not yet been determined over the full range of conditions normally encountered in fuel cell and electrolysis operation. Here we present a study of both symmetric and full cells aimed at understanding the electrochemical mechanisms of GDC-modified Ni-YSZ over a wide range of fuel compositions and temperatures. Single-step GDC infiltration at an appropriate loading substantially reduced the polarization resistance of Ni-YSZ electrodes in electrolyte-supported cells, as measured using electrochemical impedance spectroscopy (EIS) at various temperatures (600-800 {\textdegree}C) in a range of H2O-H2 mixtures (3-90 vol\% H2O). Fuel-electrode-supported cells had significant concentration polarization due to the thick Ni-YSZ supports. A distribution of relaxation times approach is used to develop a physically-based electrochemical model; the results show that GDC reduces the reaction resistance associated with three-phase boundaries, but also appears to improve oxygen transport in the electrode. Increasing the H2O fraction in the H2-H2O fuel mixture reduced both the three-phase boundary resistance and the gas diffusion resistance for Ni-YSZ; with GDC infiltration, the electrode resistance showed less variation with fuel composition. GDC infiltration improved the performance of fuel-electrode-supported full cells, which yielded a maximum power density of 2.28 W cm-2 in fuel cell mode and an electrolysis current density at 1.3 V of 2.22 A cm-2, both at 800 {\textdegree}C.}, keywords = {HTE; SOEC; Yttria-stabilized zirconia}, issn = {2050-7488}, doi = {10.1039/c9ta12316d}, author = {Park, Beom Kyeong and Roberto Scipioni and Dalton Cox and Barnett, Scott A.} } @article {1125, title = {Exploring Ca{\textendash}Ce{\textendash}M{\textendash}O (M = 3d Transition Metal) Oxide Perovskites for Solar Thermochemical Applications}, journal = {Chemistry of Materials}, volume = {32}, year = {2020}, pages = {9964-9982}, keywords = {Perovskites, Theory-driven materials discovery}, doi = {https://doi.org/10.1021/acs.chemmater.0c02912}, author = {G. Sai Gautam and E. B. Stechel and E. A. Carter} } @article {1129, title = {A First-Principles-Based Sub-Lattice Formalism for Predicting Off-Stoichiometry in Materials for Solar Thermochemical Applications: The Example of Ceria}, journal = {Advanced Theory and Simulations}, volume = {3}, year = {2020}, keywords = {off-stoichiometric materials, sub-lattice models, thermodynamic modeling}, doi = {https://doi.org/10.1002/adts.202000112}, author = {G. Sai Gautam and E. B. Stechel and E. A. Carter} } @article {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 {1122, title = {Improved Performance and Efficiency of Lanthanum{\textendash}Strontium{\textendash}Manganese Perovskites Undergoing Isothermal Redox Cycling under Controlled pH2O/pH2}, journal = {Energy \& Fuels}, volume = {34}, year = {2020}, pages = {16918-16926}, keywords = {Experimental, Isothermal cycling, Perovskites}, doi = {https://doi.org/10.1021/acs.energyfuels.0c02872}, author = {K. Lee and D. C. McCord and R. J. Carrillo and B. Guyll and J. R. Scheffe} } @article {1082, title = {Catalysts in electro-, photo- and photoelectrocatalytic CO2 reduction reactions}, journal = {Journal of Photochemistry and Photobiology C: Photochemistry Reviews}, year = {2019}, abstract = {

Published on March 2nd, 2019. Carbon dioxide (CO2) is regarded as a main contributor to the greenhouse effect. As a potential strategy to mitigate its negative impacts, the reduction of CO2 is environmentally critical, economically meaningful and scientifically challenging. Being both thermodynamically and kinetically unfavored, CO2 reduction requires catalysts as a crucial component irrespective of the reaction modes, be it electrocatalytic, photoelectrocatalytic or photocatalytic. In an effort to systematically review the types of catalysts that have been studied for CO2 reduction, we categorize them into two major groups: those being activated by external sources and those being photoexcited and activated themselves. Attention is focused on the detailed mechanisms for each group by which the reduction of CO2 proceeds, yielding a summary of the guiding principles for catalyst designs. This review highlights the importance of mechanistic studies, which permits us to discuss our perspectives on potential directions of catalyst investigation for future catalytic CO2 reduction research.

}, issn = {1389-5567}, doi = {10.1016/j.jphotochemrev.2019.02.002}, url = {http://www.sciencedirect.com/science/article/pii/S1389556718300674}, author = {Yawen Wang and Da He and Hongyu Chen and Dunwei Wang} } @article {1096, title = {Continuous on-sun solar thermochemical hydrogen production via an isothermal redox cycle}, journal = {Applied Energy}, volume = {249}, year = {2019}, month = {09/2019}, pages = {368-376}, abstract = {

Published in September 2019.

}, issn = {03062619}, doi = {10.1016/j.apenergy.2019.04.169}, url = {https://linkinghub.elsevier.com/retrieve/pii/S0306261919308293}, author = {Amanda L. Hoskins and Samantha L. Millican and Caitlin E. Czernik and Ibraheam Alshankiti and Judy C. Netter and Timothy J. Wendelin and Charles B. Musgrave and Alan W. Weimer} } @article {1083, title = {Creating stable interfaces between reactive materials: titanium nitride protects photoabsorber{\textendash}catalyst interface in water-splitting photocathodes}, journal = {Journal of Materials Chemistry A}, volume = {7}, year = {2019}, pages = {2400-2411}, abstract = {

Published on January 29th, 2019. The development of a solar-driven water splitting device that replaces costly precious metals, while achieving stable high performance, is a major challenge. Transition metal phosphides are active and low-cost catalysts for the hydrogen evolution reaction (HER), although, none thus far have exhibited stable performance when interfaced with semiconductors. Here, we report on a monolithic junction consisting of cubic-NiP2:TiN:Si, fabricated using both commercial and custom Si photovoltaics. Stable performance is achieved using an ultrathin film of crystalline TiN that effectively hinders atomic diffusion between interfaces during fabrication. Crystalline cubic-NiP2 deposited on TiN/n+p-Si retains 97\% of the bare Si photovoltage, comparable saturation current density to bare Si, and has a turnover frequency of 1.04 H2 per site per s at -100 mV applied potential. In acid, it requires only -150 mV additional overpotential compared to the benchmark, Pt/TiN/n+p-Si, to reach a HER photocurrent density of -10 mA cm-2. This photocathode maintains a stable H2 photocurrent ({\textpm}10\%) for at least 125 hours, the duration of testing. When the same layers are fabricated on a commercial Si solar cell, this photocathode produced double the photocurrent density (36.3 mA cm-2, under simulated 1.5 AM G illumination). Physical characterization gives detailed information on the properties responsible for the observed activity and durability of these interfaces. In general, the thin-film methodology presented here is widely applicable, demonstrates superior activity, and achieves long-term stability.

}, issn = {2050-7496}, doi = {10.1039/C8TA12186A}, url = {https://pubs.rsc.org/en/content/articlelanding/2019/ta/c8ta12186a}, author = {Shinjae Hwang and Spencer H. Porter and Anders B. Laursen and Hongbin Yang and Mengjun Li and Viacheslav Manichev and Karin U. D. Calvinho and Voshadhi Amarasinghe and Martha Greenblatt and Eric Garfunkel and G. Charles Dismukes} } @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} } @inbook {1073, title = {HydroGEN Overview: A Consortium on Advanced Water Splitting Materials (AWSM)}, booktitle = {FY 2018 DOE Hydrogen and Fuel Cells Program Annual Progress Report}, year = {2019}, author = {Huyen N. Dinh and R Boardman and A.H. McDaniel and H Colon-Mercado and T. Ogitsu and A.Z. Weber} } @article {1065, title = {Initial approaches in benchmarking and round robin testing for proton exchange membrane water electrolyzers}, journal = {International Journal of Hydrogen Energy}, volume = {44}, year = {2019}, month = {04/2019}, pages = {9174-9187}, abstract = {

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

}, issn = {0360-3199}, doi = {10.1016/j.ijhydene.2019.02.074}, url = {http://www.sciencedirect.com/science/article/pii/S0360319919306585}, author = {G. Bender and M. Carmo and T. Smolinka and A. Gago and N. Danilovic and M. Mueller and F. Ganci and A. Fallisch and P. Lettenmeier and K. A. Friedrich and K. Ayers and B. Pivovar and J. Mergel and D. Stolten} } @article {1066, title = {Interfacial Analysis of PEM Electrolyzer Using X-ray Computed Tomography}, journal = {Sustainable Energy \& Fuels}, year = {2019}, doi = {10.1039/C9SE00364A}, url = {https://pubs.rsc.org/en/content/articlelanding/2019/se/c9se00364a}, author = {Emily Leonard and Andrew D.~Shum and Nemaja Danilovic and Christopher Capuano and Katherine E.~Ayers and Lalit Pant and Adam Z Weber and Xianghui Xiao and Dilworth Parkinson and Iryna V~Zenyuk} } @article {1089, title = {Molybdenum Disulfide Catalytic Coatings via Atomic Layer Deposition for Solar Hydrogen Production from Copper Gallium Diselenide Photocathodes}, journal = {ACS Applied Energy Materials}, volume = {2}, year = {2019}, pages = {1060-1066}, abstract = {

We demonstrate that applying atomic layer deposition-derived molybdenum disulfide (MoS2) catalytic coatings on copper gallium diselenide (CGSe) thin film absorbers can lead to efficient wide band gap photocathodes for photoelectrochemical hydrogen production. We have prepared a device that is free of precious metals, employing a CGSe absorber and a cadmium sulfide (CdS) buffer layer, a titanium dioxide (TiO2) interfacial layer, and a MoS2 catalytic layer. The resulting MoS2/TiO2/CdS/CGSe photocathode exhibits a photocurrent onset of +0.53 V vs RHE and a saturation photocurrent density of -10 mA cm{\textendash}2, with stable operation for \>5 h in acidic electrolyte. Spectroscopic investigations of this device architecture indicate that overlayer degradation occurs inhomogeneously, ultimately exposing the underlying CGSe absorber.

}, doi = {10.1021/acsaem.8b01562}, url = {https://doi.org/10.1021/acsaem.8b01562}, author = {Thomas R. Hellstern and David W. Palm and James Carter and Alex D. DeAngelis and Kimberly Horsley and Lothar Weinhardt and Wanli Yang and Monika Blum and Nicolas Gaillard and Clemens Heske and Thomas F. Jaramillo} } @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 {704, title = {Phenyl Oxidation Impacts the Durability of Alkaline Membrane Water Electrolyzer}, journal = {ACS Applied Materials \& Interfaces}, volume = {11}, year = {2019}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {9696-9701}, abstract = {Published on March 13th, 2019. The durability of alkaline anion exchange membrane (AEM) electrolyzers is a critical requirement for implementing this technology in cost-effective hydrogen production. Here, we report that the electrochemical oxidation of the adsorbed phenyl group (found in the ionomer) on oxygen evolution catalysts produces phenol, which may cause performance deterioration in AEM electrolyzers. In-line 1H NMR kinetic analyses of phenyl oxidation in a model organic cation electrolyte shows that catalyst type significantly impacts the phenyl oxidation rate at an oxygen evolution potential. Density functional theory calculations show that the phenyl adsorption is a critical factor determining the phenyl oxidation. This research provides a path for the development of more durable AEM electrolyzers with components that can minimize the adverse impact induced by the phenyl group oxidation, such as the development of novel ionomers with fewer phenyl moieties or catalysts with less phenyl-adsorbing character.}, issn = {1944-8244}, doi = {10.1021/acsami.9b00711}, url = {https://doi.org/10.1021/acsami.9b00711}, author = {Dongguo Li and Ivana Matanovic and Albert S. Lee and Eun Joo Park and Cy Fujimoto and Hoon T. Chung and Yu Seung Kim} } @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 {1098, title = {Wide-Bandgap Cu(In,Ga)S2 Photocathodes Integrated on Transparent Conductive F:SnO2 Substrates for Chalcopyrite-Based Water Splitting Tandem Devices}, journal = {ACS Applied Energy Materials}, volume = {2}, year = {2019}, month = {08/2019}, pages = {5515-5524}, abstract = {

Published on August 26th, 2019.

}, issn = {2574-0962, 2574-0962}, doi = {10.1021/acsaem.9b00690}, url = {http://pubs.acs.org/doi/10.1021/acsaem.9b00690}, author = {Nicolas Gaillard and Dixit Prasher and Marina Chong and Alexander Deangelis and Kimberly Horsley and Hope A. Ishii and John P. Bradley and Joel Varley and Tadashi Ogitsu} } @article {776, title = {Cosputtered Calcium Manganese Oxide Electrodes for Water Oxidation}, journal = {Inorganic Chemistry}, volume = {57}, year = {2018}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {785-792}, abstract = {Published on January 16th, 2018.}, issn = {0020-1669, 1520-510X}, doi = {10.1021/acs.inorgchem.7b02717}, url = {http://pubs.acs.org/doi/10.1021/acs.inorgchem.7b02717}, author = {Hamed Simchi and Kayla A. Cooley and Jonas Ohms and Lingqin Huang and Philipp Kurz and Suzanne E. Mohney} } @article {1072, title = {Evaluating transition metal oxides within DFT-SCAN and $\text{SCAN}+U$ frameworks for solar thermochemical applications}, journal = {Physical Review Materials}, volume = {2}, year = {2018}, month = {09/2018}, pages = {095401}, abstract = {

Published on September 13th, 2018. Using the strongly constrained and appropriately normed (SCAN) and SCAN+U approximations for describing electron exchange correlation (XC) within density functional theory, we investigate the oxidation energetics, lattice constants, and electronic structure of binary Ce, Mn, and Fe oxides, which are crucial ingredients for generating renewable fuels using two-step, oxide-based, solar thermochemical reactors. Unlike other common XC functionals, we find that SCAN does not overbind the O2 molecule, based on direct calculations of its bond energy and robust agreement between calculated formation enthalpies of main group oxides versus experiments. However, in the case of transition-metal oxides, SCAN systematically overestimates (i.e., yields too negative) oxidation enthalpies due to remaining self-interaction errors in the description of their ground-state electronic structure. Adding a Hubbard U term to the transition-metal centers, where the magnitude of U is determined from experimental oxidation enthalpies, significantly improves the qualitative agreement and marginally improves the quantitative agreement of SCAN+U-calculated electronic structure and lattice parameters, respectively, with experiments. Importantly, SCAN predicts the wrong ground-state structure for a few oxides, namely, Ce2O3, Mn2O3, and Fe3O4, while SCAN+U predicts the right polymorph for all systems considered in this paper. Hence, the SCAN+U framework, with an appropriately determined U, will be required to accurately describe ground-state properties and yield qualitatively consistent electronic properties for most transition-metal and rare-earth oxides.

}, doi = {10.1103/PhysRevMaterials.2.095401}, url = {https://link.aps.org/doi/10.1103/PhysRevMaterials.2.095401}, author = {Gopalakrishnan Sai Gautam and Emily A. Carter} } @article {1085, title = {Gallium nitride nanowire as a linker of molybdenum sulfides and silicon for photoelectrocatalytic water splitting}, journal = {Nature Communications}, volume = {9}, year = {2018}, month = {09/2018}, pages = {3856}, abstract = {

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

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

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

}, issn = {1530-6984}, doi = {10.1021/acs.nanolett.8b03087}, url = {https://doi.org/10.1021/acs.nanolett.8b03087}, author = {Srinivas Vanka and Elisabetta Arca and Shaobo Cheng and Kai Sun and Gianluigi A. Botton and Glenn Teeter and Zetian Mi} } @article {1097, title = {(Invited) HydroGEN: An AWSM Energy Materials Network}, journal = {ECS Transactions}, volume = {85}, year = {2018}, month = {05/2018}, pages = {3-14}, abstract = {

The HydroGEN (https://www.h2awsm.org/) energy materials network (EMN) aims to accelerate the research and development (R\&D) of advanced water splitting (AWS) technologies for clean, sustainable hydrogen production. Announced in October 2016, the HydroGEN EMN comprises six core National Laboratories and focuses on four AWS pathways: low- and high-temperature electrolysis, photoelectrochemical, and solar thermochemical water splitting. The HydroGEN consortium offers an extensive collection of materials research capabilities for addressing R\&D challenges in discovery and design, efficacy and efficiency, durability and cost. Leveraging the HydroGEN Consortium{\textquoteright}s technical experts and broad collection of unique resource capabilities is expected to advance the maturity and technology readiness levels in each advanced water splitting technology pathway.

}, issn = {1938-6737, 1938-5862}, doi = {10.1149/08511.0003ecst}, url = {http://ecst.ecsdl.org/content/85/11/3}, author = {James W. Vickers and Huyen N. Dinh and Katie Randolph and Adam Z. Weber and Anthony H. McDaniel and Richard Boardman and Tadashi Ogitsu and Hector Colon-Mercado and David Peterson and Eric L. Miller} } @article {1069, title = {Performance enhancement of PEM electrolyzers through iridium-coated titanium porous transport layers}, journal = {Electrochemistry Communications}, volume = {97}, year = {2018}, month = {12/2018}, pages = {96-99}, abstract = {

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

}, issn = {1388-2481}, doi = {10.1016/j.elecom.2018.10.021}, url = {http://www.sciencedirect.com/science/article/pii/S1388248118302741}, author = {Chang Liu and Marcelo Carmo and Guido Bender and Andreas Everwand and Thomas Lickert and James L. Young and Tom Smolinka and Detlef Stolten and Werner Lehnert} } @article {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 {1077, title = {Solar Thermochemical Hydrogen (STCH) Processes}, journal = {The Electrochemical Society Interface}, volume = {27}, year = {2018}, pages = {53-56}, issn = {1064-8208, 1944-8783}, doi = {10.1149/2.F05181if}, url = {http://interface.ecsdl.org/lookup/doi/10.1149/2.F05181if}, author = {Maximilian B. Gorensek and Claudio Corgnale and John A. Staser and John W. Weidner} } @article {1042, title = {Solar Water Oxidation by an InGaN Nanowire Photoanode with a Bandgap of 1.7 eV}, journal = {ACS Energy Letters}, volume = {3}, year = {2018}, note = {

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

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

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

}, doi = {10.1021/acsenergylett.7b01138}, url = {https://doi.org/10.1021/acsenergylett.7b01138}, author = {Sheng Chu and Srinivas Vanka and Yichen Wang and Jiseok Gim and Yongjie Wang and Yong-Ho Ra and Robert Hovden and Hong Guo and Ishiang Shih and Zetian Mi} } @article {1030, title = {A Decade of Solid Oxide Electrolysis Improvements at DTU Energy}, journal = {ECS Transactions}, volume = {75}, year = {2017}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {3-14}, abstract = {Published on January 11th, 2017. Solid oxide electrolysis cells (SOECs) can efficiently convert electrical energy (e.g. surplus wind power) to energy stored in fuels such as hydrogen or other synthetic fuels. Performance and durability of the SOEC has increased orders of magnitudes within the last decade. This paper presents a short review of the R\&D work on SOEC single cells conducted at DTU Energy from 2005 to 2015. The SOEC improvements have involved increasing the of the oxygen electrode performance, elimination of impurities in the feed streams, optimization of processing routes, and fuel electrode structure optimization. All together, these improvements have led to a decrease in long-term degradation rate from ~40 \%/kh to ~0.4 \%/kh for steam electrolysis at -1 A/cm2, while the initial area specific resistance has been decreased from 0.44 Wcm2 to 0.15 Wcm2 at -0.5 A/cm2 and 750 {\textdegree}C.}, issn = {1938-6737, 1938-5862}, doi = {10.1149/07542.0003ecst}, url = {http://ecst.ecsdl.org/content/75/42/3}, author = {Anne Hauch and Karen Brodersen and Ming Chen and Christopher Graves and S{\o}ren H{\o}jgaard Jensen and Peter Stanley J{\o}rgensen and Peter Vang Hendriksen and Mogens Bjerg Mogensen and Simona Ovtar and Xiufu Sun} } @article {766, title = {In situ X-ray absorption spectroscopy of transition metal based water oxidation catalysts}, journal = {Chemical Society Reviews}, volume = {46}, 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 = {102-125}, issn = {0306-0012, 1460-4744}, doi = {10.1039/C6CS00230G}, url = {http://xlink.rsc.org/?DOI=C6CS00230G}, author = {Christina H. M. van Oversteeg and Hoang Q. Doan and Frank M. F. de Groot and Tanja Cuk} } @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} } @article {1011, title = {An analysis of degradation phenomena in polymer electrolyte membrane water electrolysis}, journal = {Journal of Power Sources}, volume = {326}, year = {2016}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {120-128}, abstract = {Published on September 15th, 2016. The durability of a polymer electrolyte membrane (PEM) water electrolysis single cell, assembled with regular porous transport layers (PTLs) is investigated for just over 1000~h. We observe a significant degradation rate of 194~μV~h-1 and conclude that 78\% of the detectable degradation can be explained by an increase in ohmic resistance, arising from the anodic Ti-PTL. Analysis of the polarization curves also indicates a decrease in the anodic exchange current density, j0, that results from the over-time contamination of the anode with Ti species. Furthermore, the average Pt-cathode particle size increases during the test, but we do not believe this phenomenon makes a significant contribution to increased cell voltages. To validate the anode Ti-PTL as a crucial source of increasing resistance, a second cell is assembled using Pt-coated Ti-PTLs. This yields a substantially reduced degradation rate of only 12~μV~h-1, indicating that a non-corroding anode PTL is vital for PEM electrolyzers. It is our hope that forthcoming tailored PTLs will not only contribute to fast progress on cost-efficient stacks, but also to its long-term application of PEM electrolyzers involved in industrial processes.}, issn = {0378-7753}, doi = {10.1016/j.jpowsour.2016.06.082}, url = {http://www.sciencedirect.com/science/article/pii/S0378775316307844}, author = {Christoph Rakousky and Uwe Reimer and Klaus Wippermann and Marcelo Carmo and Wiebke Lueke and Detlef Stolten} } @inbook {749, title = {Application of SR methods for the study of nanocomposite materials for Hydrogen Energy}, volume = {84}, year = {2016}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {397-406}, publisher = {Elsevier Science Bv}, organization = {Elsevier Science Bv}, address = {Amsterdam}, abstract = {This work summarizes results of synchrotron radiation (SR) studies of the real/defect structure of nanocrystalline/nanocomposite oxide materials, which determines their functional properties in hydrogen energy field as catalysts and mixed ionic electronic conductors (cathodes and anodes of solid oxide fuel cells, oxygen separation membranes). For nanocrystalline ceria-zirconia mixed oxide prepared via modified Pechini route using ethanol solution of reagents, a high spatial uniformity of cations distribution between domains along with the oxygen sublattice deficiency revealed by full-profile Rietveld refinement of SR diffraction data provide structure disordering enhancing oxygen mobility. For PrNi0.5Co0.5O3-delta - Ce0.9Y0.1O2-delta nanocomposite extensive transfer of Pr cations into fluorite domains generates a new path of fast oxygen diffusion along chains of Pr3+ - Pr4+ cations as directly proved by analysis of the unit cell relaxation after changing pO(2) in perfect agreement with data obtained by oxygen isotope heteroexchange. (C) 2016 The Authors. Published by Elsevier B.V.}, author = {V. A. Sadykov and S. N. Pavlova and Z. S. Vinokurov and A. N. Shmakov and N. F. Eremeev and Yu E. Fedorova and E. P. Yakimchuk and V. V. Kriventsov and V. A. Bolotov and Yu Yu Tanashev and E. M. Sadovskaya and S. V. Cherepanova and K. V. Zolotarev and N. A. Vinokurov and B. A. Knyazev} } @article {865, title = {Critical limitations on the efficiency of two-step thermochemical cycles}, journal = {Solar Energy}, volume = {123}, year = {2016}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {57-73}, abstract = {Published in January 2016. *The authors bring to attention the need for standardizing methods to evaluate material performance, and propose a modeling framework from which to accomplish this.}, issn = {0038092X}, doi = {10.1016/j.solener.2015.09.036}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0038092X15005228}, author = {Colby Jarrett and William Chueh and Cansheng Yuan and Yoshiaki Kawajiri and Kenneth H. Sandhage and Asegun Henry} } @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 {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 {1002, title = {Benchmarking Hydrogen Evolving Reaction and Oxygen Evolving Reaction Electrocatalysts for Solar Water Splitting Devices}, journal = {Journal of the American Chemical Society}, volume = {137}, year = {2015}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {4347-4357}, abstract = {Published on April 8th, 2015. Objective comparisons of electrocatalyst activity and stability using standard methods under identical conditions are necessary to evaluate the viability of existing electrocatalysts for integration into solar-fuel devices as well as to help inform the development of new catalytic systems. Herein, we use a standard protocol as a primary screen for evaluating the activity, short-term (2 h) stability, and electrochemically active surface area (ECSA) of 18 electrocatalysts for the hydrogen evolution reaction (HER) and 26 electrocatalysts for the oxygen evolution reaction (OER) under conditions relevant to an integrated solar water-splitting device in aqueous acidic or alkaline solution. Our primary figure of merit is the overpotential necessary to achieve a magnitude current density of 10 mA cm{\textendash}2 per geometric area, the approximate current density expected for a 10\% efficient solar-to-fuels conversion device under 1 sun illumination. The specific activity per ECSA of each material is also reported. Among HER catalysts, several could operate at 10 mA cm{\textendash}2 with overpotentials <0.1 V in acidic and/or alkaline solutions. Among OER catalysts in acidic solution, no non-noble metal based materials showed promising activity and stability, whereas in alkaline solution many OER catalysts performed with similar activity achieving 10 mA cm{\textendash}2 current densities at overpotentials of \~{}0.33{\textendash}0.5 V. Most OER catalysts showed comparable or better specific activity per ECSA when compared to Ir and Ru catalysts in alkaline solutions, while most HER catalysts showed much lower specific activity than Pt in both acidic and alkaline solutions. For select catalysts, additional secondary screening measurements were conducted including Faradaic efficiency and extended stability measurements.}, issn = {0002-7863}, doi = {10.1021/ja510442p}, url = {https://doi.org/10.1021/ja510442p}, author = {Charles C. L. McCrory and Suho Jung and Ivonne M. Ferrer and Shawn M. Chatman and Jonas C. Peters and Thomas F. Jaramillo} } @article {1135, title = {Best Practices in Perovskite Solar Cell Efficiency Measurements. Avoiding the Error of Making Bad Cells Look Good}, journal = {Journal of Physical Chemistry Letters}, volume = {6}, year = {2015}, month = {03}, pages = {852-857}, keywords = {additive engineering, encapsulation, Perovskite, perovskite defects, perovskite degradation, perovskite solar cell, perovskite solar cell stability}, doi = {10.1021/acs.jpclett.5b00289}, author = {Christians, Jeffrey and Manser, Joseph and Kamat, Prashant} } @article {951, title = {Design of a Solar Reactor to Split CO2 Via Isothermal Redox Cycling of Ceria}, journal = {Journal of Solar Energy Engineering}, volume = {137}, year = {2015}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {031007}, url = {https://solarenergyengineering.asmedigitalcollection.asme.org/article.aspx?articleID=1920469}, author = {Roman Bader and Rohini Bala Chandran and Luke J. Venstrom and Stephen J. Sedler and Peter T. Krenzke and Robert M. De Smith and Aayan Banerjee and Thomas R. Chase and Jane H. Davidson and Wojciech Lipi{\'L} and } } @article {794, title = {Influence of the synthesis route on the formation of 12R/10H-polytypes and their magnetic properties within the Ba(Ce,Mn)O 3 family}, journal = {New Journal of Chemistry}, volume = {39}, 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 = {829-835}, issn = {1144-0546, 1369-9261}, doi = {10.1039/C4NJ00798K}, url = {http://xlink.rsc.org/?DOI=C4NJ00798K}, author = {Mario A. Mac{\'\i}as and Olivier Mentr{\'e} and Caroline Pirovano and Pascal Roussel and Silviu Colis and Gilles H. Gauthier} } @article {1006, title = {Methods for comparing the performance of energy-conversion systems for use in solar fuels and solar electricity generation}, journal = {Energy \& Environmental Science}, volume = {8}, 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 = {2886-2901}, doi = {10.1039/C5EE00777A}, url = {http://pubs.rsc.org/en/Content/ArticleLanding/2015/EE/C5EE00777A}, author = {Robert H.~Coridan and Adam C.~Nielander and Sonja A.~Francis and Matthew T.~McDowell and Victoria Dix and Shawn M.~Chatman and Nathan S.~Lewis} } @article {856, title = {A new solar fuels reactor concept based on a liquid metal heat transfer fluid: Reactor design and efficiency estimation}, journal = {Solar Energy}, volume = {122}, 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 = {547-561}, abstract = {Published in December 2015.}, issn = {0038092X}, doi = {10.1016/j.solener.2015.08.019}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0038092X15004557}, author = {Cansheng Yuan and Colby Jarrett and William Chueh and Yoshiaki Kawajiri and Asegun Henry} } @article {861, title = {Predicting the solar thermochemical water splitting ability and reaction mechanism of metal oxides: a case study of the hercynite family of water splitting cycles}, journal = {Energy Environ. Sci.}, 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} }, issn = {1754-5692, 1754-5706}, doi = {10.1039/C5EE01979F}, url = {http://xlink.rsc.org/?DOI=C5EE01979F}, author = {Christopher L. Muhich and Brian D. Ehrhart and Vanessa A. Witte and Samantha L. Miller and Eric N. Coker and Charles B. Musgrave and Alan W. Weimer} } @article {929, title = {Advancing Oxide Materials for Thermochemical Production of Solar Fuels}, 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 = {2019-2026}, issn = {18766102}, doi = {10.1016/j.egypro.2014.03.214}, url = {http://linkinghub.elsevier.com/retrieve/pii/S1876610214006687}, author = {J.E. Miller and A. Ambrosini and E.N. Coker and M.D. Allendorf and A.H. McDaniel} } @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 {807, title = {Cobalt Ferrite in YSZ for Use as Reactive Material in Solar Thermochemical Water and Carbon Dioxide Splitting, Part II: Kinetic Modeling}, journal = {JOM}, 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} }, abstract = {Published on October 8th, 2013.}, issn = {1047-4838, 1543-1851}, doi = {10.1007/s11837-013-0774-1}, url = {http://link.springer.com/10.1007/s11837-013-0774-1}, author = {Kyle M. Allen and Nick Auyeung and Nima Rahmatian and James F. Klausner and Eric N. Coker} } @book {1000, title = {Photoelectrochemical Water Splitting: Standards, Experimental Methods, and Protocols}, series = {SpringerBriefs in Energy}, 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} }, publisher = {Springer-Verlag}, organization = {Springer-Verlag}, address = {New York}, abstract = {This book outlines many of the techniques involved in materials development and characterization for photoelectrochemical (PEC) {\textendash} for example, proper metrics for describing material performance, how to assemble testing cells and prepare materials for assessment of their properties, and how to perform the experimental measurements needed to achieve reliable results towards better scientific understanding. For each technique, proper procedure, benefits, limitations, and data interpretation are discussed. Consolidating this information in a short, accessible, and easy to read reference guide will allow researchers to more rapidly immerse themselves into PEC research and also better compare their results against those of other researchers to better advance materials development. This book serves as a {\textquotedblleft}how-to{\textquotedblright} guide for researchers engaged in or interested in engaging in the field of photoelectrochemical (PEC) water splitting. PEC water splitting is a rapidly growing field of research in which the goal is to develop materials which can absorb the energy from sunlight to drive electrochemical hydrogen production from the splitting of water. The substantial complexity in the scientific understanding and experimental protocols needed to sufficiently pursue accurate and reliable materials development means that a large need exists to consolidate and standardize the most common methods utilized by researchers in this field.}, isbn = {9781461482970}, url = {//www.springer.com/us/book/9781461482970}, author = {Zhebo Chen and Huyen Dinh and Eric Miller} } @article {837, title = {A review on development of industrial processes and emerging techniques for production of hydrogen from renewable and sustainable sources}, journal = {Renewable and Sustainable Energy Reviews}, volume = {23}, year = {2013}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {443-462}, abstract = {Published in July 2013.}, issn = {13640321}, doi = {10.1016/j.rser.2013.02.019}, url = {http://linkinghub.elsevier.com/retrieve/pii/S1364032113001214}, author = {Rashmi Chaubey and Satanand Sahu and Olusola O. James and Sudip Maity} } @article {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 {908, title = {Oxygen Transport and Isotopic Exchange in Iron Oxide/YSZ Thermochemically-active Materials via Splitting of C(18O)2 at High Temperature Studied by Thermogravimetric Analysis and Secondary Ion Mass Spectrometry}, journal = {Journal of Materials Chemistry}, volume = {22}, year = {2012}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {6726}, issn = {0959-9428, 1364-5501}, doi = {10.1039/c2jm15324f}, url = {http://xlink.rsc.org/?DOI=c2jm15324f}, author = {Eric N. Coker and James A. Ohlhausen and Andrea Ambrosini and James E. Miller} } @article {1005, title = {Recommended Best Practices for the Characterization of Storage Properties of Hydrogen Storage Materials | Department of Energy}, year = {2012}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, url = {https://energy.gov/eere/fuelcells/downloads/recommended-best-practices-characterization-storage-properties-hydrogen-0}, author = {Karl J. Gross and K. Russell Carrington and Steven Barcelo} } @article {919, title = {Reimagining liquid transportation fuels : Sunshine to Petrol.}, number = {SAND2012-0307}, year = {2012}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, url = {http://www.osti.gov/servlets/purl/1035344/}, author = {James Edward Miller and Mark D. Allendorf and Andrea Ambrosini and Ken Shuang Chen and Eric Nicholas Coker and Daniel E. Dedrick and Richard B., Jr. Diver and Roy E., Jr. Hogan and Ivan Ermanoski and Terry Alan Johnson and Gary L. Kellog and Anthony H. McDaniel and Nathan Phillip Siegel and Chad Lynn Staiger and Ellen Beth Stechel} } @article {895, title = {Ferrite-YSZ composites for solar thermochemical production of synthetic fuels: in operando characterization of CO2 reduction}, journal = {Journal of Materials Chemistry}, volume = {21}, year = {2011}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {10767{\textendash}10776}, url = {http://pubs.rsc.org/en/content/articlehtml/2011/jm/c1jm11053e}, author = {E. N. Coker and A. Ambrosini and M. A. Rodriguez and J. E. Miller} } @article {799, title = {Synthesis and characterization of oxide materials for thermochemical CO2 splitting using concentrated solar energy.}, year = {2011}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, author = {Andrea Ambrosini and Ellen B Stechel and Eric Nicholas Coker and James E Miller and James Anthony Ohlhausen and Mark A Rodriguez} } @article {894, title = {Concentrated solar power for renewable electricity and hydrogen production from water{\textemdash}a review}, journal = {Energy \& Environmental Science}, volume = {3}, year = {2010}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {1398}, issn = {1754-5692, 1754-5706}, doi = {10.1039/b922607a}, url = {http://xlink.rsc.org/?DOI=b922607a}, author = {B. Coelho and A. C. Oliveira and A. Mendes} } @article {886, title = {Investigation of Reactive Cerium-Based Oxides for H2 Production by Thermochemical Two-Step Water-Splitting}, journal = {Journal of Materials Science}, volume = {45}, year = {2010}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {4163{\textendash}4173}, url = {http://www.springerlink.com/index/G26346278216MJ23.pdf}, author = {S. Abanades and A. Legal and A. Cordier and G. Peraudeau and G. Flamant and A. Julbe} } @article {903, title = {Solar hydrogen: fuel of the near future}, journal = {Energy \& Environmental Science}, volume = {3}, year = {2010}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {279{\textendash}287}, url = {http://pubs.rsc.org/en/content/articlehtml/2010/ee/b923793n}, author = {M. Pagliaro and A. G. Konstandopoulos and R. Ciriminna and G. Palmisano} } @inbook {800, title = {Synthesis and characterization of ferrite materials for thermochemical CO2 splitting using concentrated solar energy}, year = {2010}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {1{\textendash}13}, publisher = {American Chemical Society}, organization = {American Chemical Society}, author = {Andrea Ambrosini and Eric N Coker and Mark A Rodriguez and Stephanie Livers and Lindsey R Evans and James E Miller and Ellen B Stechel} } @article {818, title = {A thermochemical study of ceria: Exploiting an old material for new modes of energy conversion and CO2 mitigation}, journal = {Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences}, volume = {368}, year = {2010}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {3269-3294}, abstract = {Published on June 21st, 2010.}, issn = {1364-503X, 1471-2962}, doi = {10.1098/rsta.2010.0114}, url = {http://rsta.royalsocietypublishing.org/cgi/doi/10.1098/rsta.2010.0114}, author = {W. C. Chueh and S. M. Haile} } @article {812, title = {Ceria as a Thermochemical Reaction Medium for Selectively Generating Syngas or Methane from H2O and CO2}, journal = {ChemSusChem}, volume = {2}, year = {2009}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {735-739}, abstract = {Published on August 24th, 2009.}, issn = {18645631, 1864564X}, doi = {10.1002/cssc.200900138}, url = {http://doi.wiley.com/10.1002/cssc.200900138}, author = {William C. Chueh and Sossina M. Haile} } @article {996, title = {Catalyst evaluation for a sulfur dioxide-depolarized electrolyzer}, journal = {Electrochemistry Communications}, volume = {9}, year = {2007}, 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 = {2649-2653}, abstract = {Published on November 1st, 2007. Thermochemical processes are being developed to provide global-scale quantities of hydrogen. A variant on sulfur-based thermochemical cycles is the hybrid sulfur (HyS) process which uses a sulfur dioxide-depolarized electrolyzer (SDE) to produce the hydrogen. Testing examined the activity and stability of platinum and palladium as the electrocatalyst for the SDE in highly concentrated sulfuric acid solutions. Cyclic and linear sweep voltammetry revealed that platinum provided better catalytic activity with much lower potentials and higher currents than palladium. Testing also showed that the catalyst activity is strongly influenced by the concentration of the sulfuric acid electrolyte.}, issn = {1388-2481}, doi = {10.1016/j.elecom.2007.08.015}, url = {http://www.sciencedirect.com/science/article/pii/S1388248107003451}, author = {H{\'e}ctor R. Col{\'o}n-Mercado and David T. Hobbs} } @article {755, title = {The crystal structure of compositionally homogeneous mixed ceria-zirconia oxides by high resolution X-ray and neutron diffraction methods}, journal = {Open Chemistry}, volume = {15}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {438-445}, abstract = {The real/atomic structure of single phase homogeneous nanocrystalline Ce0.5Zr0.5O2 +/- delta oxides prepared by a modified Pechini route and Ni-loaded catalysts of methane dry reforming on their bases was studied by a combination of neutron diffraction, synchrotron X-ray diffraction, total X-ray scattering and X-ray absorption spectroscopy. The effects of sintering temperature and pretreatment in H-2 were elucidated. The structure of the mixed oxides corresponds to a tetragonal space group indicating a homogeneous distribution of Ce and Zr cations in the lattice. A pronounced disordering of the oxygen sublattice was revealed by neutron diffraction, supposedly due to incorporation of water into the structure when in contact with air promoted by the generation of anion vacancies in the lattice after reduction or calcination at high temperatures. However, such disordering has not resulted in any occupation of the oxygen interstitial positions in the bulk of the nanodomains.}, issn = {2391-5420}, doi = {10.1515/chem-2017-0044}, author = {Alexander N. Shmakov and Svetlana V. Cherepanova and Dmitrii A. Zyuzin and Yulia E. Fedorova and Ivan A. Bobrikov and Anne-Cecile Roger and Andrzej Adamski and Vladislav A. Sadykov} } @article {751, title = {Defect engineering by synchrotron radiation X-rays in CeO2 nanocrystals}, journal = {Journal of Synchrotron Radiation}, volume = {25}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {1395-1399}, abstract = {This work reports an unconventional defect engineering approach using synchrotron-radiation-based X-rays on ceria nanocrystal catalysts of particle sizes 4.4-10.6nm. The generation of a large number of oxygen-vacancy defects (OVDs), and therefore an effective reduction of cations, has been found in CeO2 catalytic materials bombarded by high-intensity synchrotron X-ray beams of beam size 1.5mmx0.5mm, photon energies of 5.5-7.8keV and photon fluxes up to 1.53x10(12) photons s(-1). The experimentally observed cation reduction was theoretically explained by a first-principles formation-energy calculation for oxygen vacancy defects. The results clearly indicate that OVD formation is mainly a result of X-ray-excited core holes that give rise to valence holes through electron down conversion in the material. Thermal annealing and subvalent Y-doping were also employed to modulate the efficiency of oxygen escape, providing extra control on the X-ray-induced OVD generating process. Both the core-hole-dominated bond breaking and oxygen escape mechanisms play pivotal roles for efficient OVD formation. This X-ray irradiation approach, as an alternative defect engineering method, can be applied to a wide variety of nanostructured materials for physical-property modification.}, issn = {1600-5775}, doi = {10.1107/S1600577518008184}, author = {Tai-Sing Wu and Leng-You Syu and Shih-Chang Weng and Horng-Tay Jeng and Shih-Lin Chang and Yun-Liang Soo} } @article {864, title = {Demonstration of a solar reactor for carbon dioxide splitting via the isothermal ceria redox cycle and practical implications}, journal = {Energy \& Fuels}, 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 = {6654-6661}, issn = {0887-0624, 1520-5029}, doi = {10.1021/acs.energyfuels.6b01265}, url = {http://pubs.acs.org/doi/abs/10.1021/acs.energyfuels.6b01265}, author = {Brandon J. Hathaway and Rohini Bala Chandran and Adam C. Gladen and Thomas R. Chase and Jane H. Davidson} } @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 {918, title = {Development and Assessment of Solar-Thermal-Activated Fuel Production. Phase 1, Summary.}, number = {SAND2012-5658, 1055617}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, url = {http://www.osti.gov/servlets/purl/1055617/}, author = {James Edward Miller and Mark D. Allendorf and Andrea Ambrosini and Eric Nicholas Coker and Richard B., Jr. Diver and Ivan Ermanoski and Lindsey R. Evans and Roy E., Jr. Hogan and Anthony H. McDaniel} } @article {998, title = {Development and testing of a PEM SO2-depolarized electrolyzer and an operating method that prevents sulfur accumulation}, journal = {International Journal of Hydrogen Energy}, volume = {40}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {13281-13294}, abstract = {The hybrid sulfur (HyS) cycle is being developed as a technology to generate hydrogen by splitting water, using heat and electrical power from a nuclear or solar power plant. A key component is the SO2-depolarized electrolysis (SDE) cell, which reacts SO2 and water to form hydrogen and sulfuric acid. SDE could also be used in once-through operation to consume SO2 and generate hydrogen and sulfuric acid for sale. A proton exchange membrane (PEM) SDE cell based on a PEM fuel cell design was fabricated and tested. Measured cell potential as a function of anolyte pressure and flow rate, sulfuric acid concentration, and cell temperature are presented for this cell. Sulfur accumulation was observed inside the cell, which could have been a serious impediment to further development. A method to prevent sulfur formation was subsequently developed. This was made possible by a testing facility that allowed unattended operation for extended periods.}, issn = {0360-3199}, doi = {10.1016/j.ijhydene.2015.08.041}, url = {http://www.sciencedirect.com/science/article/pii/S0360319915021370}, author = {John L. Steimke and Timothy J. Steeper and H{\'e}ctor R. Col{\'o}n-Mercado and Maximilian B. Gorensek} } @article {803, title = {Development of the hybrid sulfur cycle for use with concentrated solar heat. I. Conceptual design}, journal = {International Journal of Hydrogen Energy}, volume = {42}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {20939-20954}, abstract = {A detailed conceptual design of a solar hybrid sulfur (HyS) cycle is proposed. Numerous design tradeoffs, including process operating conditions and strategies, methods of integration with solar energy sources, and solar design options were considered. A baseline design was selected, and process flowsheets were developed. Pinch analyses were performed to establish the limiting energy efficiency. Detailed material and energy balances were completed, and a full stream table prepared. Design assumptions include use of: location in the southwest US desert, falling particle concentrated solar receiver, indirect heat transfer via pressurized helium, continuous operation with thermal energy storage, liquid-fed electrolyzer with PBI membrane, and bayonet-type acid decomposer. Thermochemical cycle efficiency for the HyS process was estimated to be 35.0\%, LHV basis. The solar-to-hydrogen (STH) energy conversion ratio was 16.9\%. This exceeds the Year 2015 DOE STCH target of STH >10\%, and shows promise for meeting the Year 2020 target of 20\%.}, issn = {0360-3199}, doi = {10.1016/j.ijhydene.2017.06.241}, url = {http://www.sciencedirect.com/science/article/pii/S0360319917327027}, author = {Maximilian B. Gorensek and Claudio Corgnale and William A. Summers} } @article {966, title = {Doped calcium manganites for advanced high-temperature thermochemical energy storage: Doped calcium manganites for thermochemical energy storage}, journal = {International Journal of Energy Research}, volume = {40}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {280-284}, issn = {0363907X}, doi = {10.1002/er.3467}, url = {http://doi.wiley.com/10.1002/er.3467}, author = {Sean M. Babiniec and Eric N. Coker and James E. Miller and Andrea Ambrosini} } @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 {783, title = {Electron-energy-loss core-edge structures in manganese oxides}, journal = {Physical Review B}, 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 = {2102-2108}, issn = {0163-1829, 1095-3795}, doi = {10.1103/PhysRevB.48.2102}, url = {https://link.aps.org/doi/10.1103/PhysRevB.48.2102}, author = {Hiroki Kurata and Christian Colliex} } @article {997, title = {Evaluation of proton-conducting membranes for use in a sulfur dioxide depolarized electrolyzer}, journal = {Journal of Power Sources}, volume = {195}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {2823-2829}, abstract = {The chemical stability, sulfur dioxide transport, ionic conductivity, and electrolyzer performance have been measured for several commercially available and experimental proton exchange membranes (PEMs) for use in a sulfur dioxide depolarized electrolyzer (SDE). The SDEs function is to produce hydrogen by using the Hybrid Sulfur (HyS) Process, a sulfur-based electrochemical/thermochemical hybrid cycle. Membrane stability was evaluated using a screening process where each candidate PEM was heated at 80{\textdegree}C in 60wt\% H2SO4 for 24h. Following acid exposure, chemical stability for each membrane was evaluated by FTIR using the ATR sampling technique. Membrane SO2 transport was evaluated using a two-chamber permeation cell. SO2 was introduced into one chamber whereupon SO2 transported across the membrane into the other chamber and oxidized to H2SO4 at an anode positioned immediately adjacent to the membrane. The resulting current was used to determine the SO2 flux and SO2 transport. Additionally, membrane electrode assemblies (MEAs) were prepared from candidate membranes to evaluate ionic conductivity and selectivity (ionic conductivity vs. SO2 transport) which can serve as a tool for selecting membranes. MEAs were also performance tested in a HyS electrolyzer measuring current density vs. a constant cell voltage (1V, 80{\textdegree}C in SO2 saturated 30wt\% H2SO4). Finally, candidate membranes were evaluated considering all measured parameters including SO2 flux, SO2 transport, ionic conductivity, HyS electrolyzer performance, and membrane stability. Candidate membranes included both PFSA and non-PFSA polymers and polymer blends of which the non-PFSA polymers, BPVE-6F and PBI, showed the best selectivity.}, issn = {0378-7753}, doi = {10.1016/j.jpowsour.2009.11.031}, url = {http://www.sciencedirect.com/science/article/pii/S0378775309020394}, author = {Mark C. Elvington and Hector Colon-Mercado and Steve McCatty and Simon G. Stone and David T. Hobbs} } @article {840, title = {Experimental study of SnO 2 /SnO/Sn thermochemical systems for solar production of hydrogen}, journal = {AIChE Journal}, volume = {54}, 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 = {2759-2767}, issn = {00011541, 15475905}, doi = {10.1002/aic.11584}, url = {http://doi.wiley.com/10.1002/aic.11584}, author = {Patrice Charvin and St{\'e}phane Abanades and Florent Lemont and Gilles Flamant} } @article {986, title = {Exploring the Redox Behavior of La0.6Sr0.4Mn1-xAlxO3 Perovskites for CO2-Splitting in Thermochemical Cycles}, journal = {Topics in Catalysis}, volume = {60}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {1108-1118}, issn = {1022-5528, 1572-9028}, doi = {10.1007/s11244-017-0790-4}, url = {http://link.springer.com/10.1007/s11244-017-0790-4}, author = {Daniel Sastre and Alfonso J. Carrillo and David P. Serrano and Patricia Pizarro and Juan M. Coronado} } @article {1039, title = {High Temperature Electrolysis for Hydrogen Production from Nuclear Energy {\textendash} TechnologySummary}, number = {INL/EXT-09-16140}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, abstract = {The U.S. Department of Energy{\textquoteright}s Office of Scientific and Technical Information}, url = {https://www.osti.gov/biblio/978368-high-temperature-electrolysis-hydrogen-production-from-nuclear-energy-technologysummary}, author = {J. E. O{\textquoteright}Brien and C. M. Stoots and J. S. Herring and M. G. McKellar and E. A. Harvego and M. S. Sohal and K. G. Condie} } @article {970, title = {High temperature hydrogen production: Design of a 750kW demonstration plant for a two-step thermochemical cycle}, journal = {Solar Energy}, volume = {135}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {232-241}, issn = {0038092X}, doi = {10.1016/j.solener.2016.05.059}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0038092X16301773}, author = {J.-P. S{\"a}ck and S. Breuer and P. Cotelli and A. Houaijia and M. Lange and M. Wullenkord and C. Spenke and M. Roeb and Chr. Sattler} } @article {746, title = {High Temperature Structural Study of Gd-Doped Ceria by Synchrotron X-ray Diffraction (673 K <= T <= 1073 K)}, journal = {Inorganic Chemistry}, volume = {53}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {10140-10149}, abstract = {The crystallographic features of Gd-doped ceria were investigated at the operating temperature of solid oxides fuel cells, where these materials are used as solid electrolytes. (Ce1{\textendash}xGdx)O2-x/2 samples (x = 0.1, 0.3, 0.5, 0.7) were prepared by coprecipitation of mixed oxalates, treated at 1473 K in air, and analyzed by synchrotron X-ray diffraction in the temperature range 673 K <= T <= 1073 K at the Elettra synchrotron radiation facility located in Trieste, Italy. In the whole temperature span a boundary was found at x \~{} 0.2 between a CeO2-based solid solution (for x <= 0.2) and a structure where Gd2O3 microdomains grow within the CeO2 matrix, taking advantage of the similarity between Gd3+ and Ce4+ sizes; the existence of the boundary at x \~{} 0.2 was confirmed also by measurements of ionic conductivity performed by impedance spectroscopy. Similar to what observed at room temperature, the trend of the cell parameter shows the presence of a maximum; with increasing temperature, the composition corresponding to the maximum moves toward lower Gd content. This evidence can be explained by analyzing the behavior of the coefficient of thermal expansion as a function of composition.}, issn = {0020-1669}, doi = {10.1021/ic5011242}, url = {https://doi.org/10.1021/ic5011242}, author = {Cristina Artini and Marcella Pani and Andrea Lausi and Roberto Masini and Giorgio A. Costa} } @article {887, title = {High-flux solar-driven thermochemical dissociation of CO2 and H2O using nonstoichiometric ceria}, journal = {Science}, volume = {330}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {1797-1801}, issn = {0036-8075, 1095-9203}, doi = {10.1126/science.1197834}, url = {http://www.sciencemag.org/cgi/doi/10.1126/science.1197834}, author = {W. C. Chueh and C. Falter and M. Abbott and D. Scipio and P. Furler and S. M. Haile and A. Steinfeld} } @article {945, title = {Kinetics of CO2 reduction over nonstoichiometric ceria}, journal = {The Journal of Physical Chemistry C}, volume = {119}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {16452-16461}, issn = {1932-7447, 1932-7455}, doi = {10.1021/acs.jpcc.5b03464}, url = {http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.5b03464}, author = {Simon Ackermann and Laurent Sauvin and Roberto Castiglioni and Jennifer L. M. Rupp and Jonathan R. Scheffe and Aldo Steinfeld} } @article {1022, title = {Long-time anodisation of titanium in sulphuric acid}, journal = {Surface and Coatings Technology}, volume = {202}, 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 = {1379-1384}, abstract = {The long-time behaviour of CP titanium in 1~M H2SO4 has been investigated. The authors revealed electrochemical behaviour during the long-time chrono-amperometric experiments. The ex-situ observations (EIS, ellipsometry, SEM and optical microscopy) brought out information concerning morphological changes of the surface as well as the change in the oxide thickness during the anodic oxidation process. From the obtained data, the authors developed a hypothesis describing the potentiostatic anodisation of titanium at voltages (up to 15~V) in 1~M H2SO4 with respect to time of anodisation.}, issn = {0257-8972}, doi = {10.1016/j.surfcoat.2007.06.027}, url = {http://www.sciencedirect.com/science/article/pii/S0257897207006676}, author = {D. Capek and M. -P. Gigandet and M. Masmoudi and M. Wery and O. Banakh} } @article {912, title = {Materials-Related Aspects of Thermochemical Water and Carbon Dioxide Splitting: A Review}, journal = {Materials}, volume = {5}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {2015-2054}, issn = {1996-1944}, doi = {10.3390/ma5112015}, url = {http://www.mdpi.com/1996-1944/5/11/2015/}, author = {Martin Roeb and Martina Neises and Nathalie Monnerie and Friedemann Call and Heike Simon and Christian Sattler and Martin Schm{\"u}cker and Robert Pitz-Paal} } @article {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 {863, title = {Origin and Tunability of Unusually Large Surface Capacitance in Doped Cerium Oxide Studied by Ambient-Pressure X-Ray Photoelectron Spectroscopy}, journal = {Advanced Materials}, volume = {28}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {4692-4697}, issn = {09359648}, doi = {10.1002/adma.201506333}, url = {http://doi.wiley.com/10.1002/adma.201506333}, author = {Chirranjeevi Balaji Gopal and Farid El Gabaly and Anthony H. McDaniel and William C. Chueh} } @article {967, title = {Oxidation and reduction reaction kinetics of mixed cerium zirconium oxides}, journal = {The Journal of Physical Chemistry C}, volume = {120}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {2027-2035}, issn = {1932-7447, 1932-7455}, doi = {10.1021/acs.jpcc.5b08729}, url = {http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.5b08729}, author = {B. Bulfin and F. Call and J. Vieten and M. Roeb and C. Sattler and I. V. Shvets} } @article {976, title = {Oxygen nonstoichiometry, defect equilibria, and thermodynamic characterization of LaMnO3 perovskites with Ca/Sr A-site and Al B-site doping}, journal = {Acta Materialia}, volume = {103}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {700-710}, issn = {13596454}, doi = {10.1016/j.actamat.2015.10.026}, url = {http://linkinghub.elsevier.com/retrieve/pii/S1359645415300264}, author = {M. Takacs and M. Hoes and M. Caduff and T. Cooper and J.R. Scheffe and A. Steinfeld} } @article {1032, title = {Quality Assurance of Solid Oxide Fuel Cell (SOFC) and Electrolyser (SOEC) Stacks}, journal = {ECS Transactions}, volume = {78}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {2077-2086}, abstract = {In the EU-funded project {\textquotedblleft}Solid oxide cell and stack testing and quality assurance{\textquotedblright} (SOCTESQA) standardized and industry wide test modules and programs for high temperature solid oxide cells and stacks are being developed. These test procedures can be applied for the fuel cell (SOFC), the electrolysis (SOEC) and in the combined SOFC/SOEC mode. In order to optimize the test modules the project partners have tested identical SOC stacks with the same test programs in several testing campaigns. Altogether 10 pre-normative test modules were developed: Start-up, current-voltage characteristics, electrochemical impedance spectroscopy, reactant utilization, reactant gas composition, temperature sensitivity, operation at constant current, operation at varying current, thermal cycling and shut-down. The test modules were validated by comparing the results in terms of repeatability of the different testing campaigns and in terms of reproducibility among the different partners. Moreover, the results are discussed in context to the test input parameters.}, issn = {1938-6737, 1938-5862}, doi = {10.1149/07801.2077ecst}, url = {http://ecst.ecsdl.org/content/78/1/2077}, author = {Michael Lang and Corinna Auer and Karine Couturier and Xiufu Sun and Stephen J. McPhail and Thomas Malkow and Qingxi Fu and Qinglin Liu} } @article {771, title = {Resonant soft x-ray powder diffraction study to determine the orbital ordering in A-site-ordered SmBaMn 2 O 6}, journal = {Physical Review B}, volume = {77}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, issn = {1098-0121, 1550-235X}, doi = {10.1103/PhysRevB.77.060402}, url = {https://link.aps.org/doi/10.1103/PhysRevB.77.060402}, author = {M. Garc{\'\i}a-Fern{\'a}ndez and U. Staub and Y. Bodenthin and S. M. Lawrence and A. M. Mulders and C. E. Buckley and S. Weyeneth and E. Pomjakushina and K. Conder} } @article {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 {829, title = {Screening of water-splitting thermochemical cycles potentially attractive for hydrogen production by concentrated solar energy}, journal = {Energy}, volume = {31}, 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 = {2805-2822}, issn = {03605442}, doi = {10.1016/j.energy.2005.11.002}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0360544205002410}, author = {S Abanades and P Charvin and G Flamant and P Neveu} } @article {757, title = {Structural Change of the Mn Cluster during the S2{\textrightarrow}S3 State Transition of the Oxygen-Evolving Complex of Photosystem II. Does It Reflect the Onset of Water/Substrate Oxidation? Determination by Mn X-ray Absorption Spectroscopy}, journal = {Journal of the American Chemical Society}, volume = {122}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {3399-3412}, abstract = {The oxygen-evolving complex of Photosystem II in plants and cyanobacteria catalyzes the oxidation of two water molecules to one molecule of dioxygen. A tetranuclear Mn complex is believed to cycle through five intermediate states (S0-S4) to couple the four-electron oxidation of water with the one-electron photochemistry occurring at the Photosystem II reaction center. We have used X-ray absorption spectroscopy to study the local structure of the Mn complex and have proposed a model for it, based on studies of the Mn K-edges and the extended X-ray absorption fine structure of the S1 and S2 states. The proposed model consists of two di-μ-oxo-bridged binuclear Mn units with Mn-Mn distances of \~{}2.7 {\r A} that are linked to each other by a mono-μ-oxo bridge with a Mn-Mn separation of \~{}3.3 {\r A}. The Mn-Mn distances are invariant in the native S1 and S2 states. This report describes the application of X-ray absorption spectroscopy to S3 samples created under physiological conditions with saturating flash illumination. Significant changes are observed in the Mn-Mn distances in the S3 state compared to the S1 and the S2 states. The two 2.7 {\r A} Mn-Mn distances that characterize the di-μ-oxo centers in the S1 and S2 states are lengthened to \~{}2.8 and 3.0 {\r A} in the S3 state, respectively. The 3.3 {\r A} Mn-Mn and Mn-Ca distances also increase by 0.04-0.2 {\r A}. These changes in Mn-Mn distances are interpreted as consequences of the onset of substrate/water oxidation in the S3 state. Mn-centered oxidation is evident during the S0{\textrightarrow}S1 and S1{\textrightarrow}S2 transitions. We propose that the changes in Mn-Mn distances during the S2{\textrightarrow}S3 transition are the result of ligand or water oxidation, leading to the formation of an oxyl radical intermediate formed at a bridging or terminal position. The reaction of the oxyl radical with OH-, H2O, or an oxo group during the subsequent S state conversion is proposed to lead to the formation of the O-O bond. Models that can account for changes in the Mn-Mn distances in the S3 state and the implications for the mechanism of water oxidation are discussed.}, issn = {0002-7863}, doi = {10.1021/ja992501u}, url = {https://doi.org/10.1021/ja992501u}, author = {Wenchuan Liang and Theo A. Roelofs and Roehl M. Cinco and Annette Rompel and Matthew J. Latimer and Wa O. Yu and Kenneth Sauer and Melvin P. Klein and Vittal K. Yachandra} } @article {747, title = {Structural Features of Sm- and Gd-Doped Ceria Studied by Synchrotron X-ray Diffraction and μ-Raman Spectroscopy}, journal = {Inorganic Chemistry}, volume = {54}, 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 = {4126-4137}, abstract = {A structural study of Sm- and Gd-doped ceria was performed with the aim to clarify some unexplained structural features. (Ce1{\textendash}xREx)O2{\textendash}x/2 samples (RE = Sm, Gd; x = 0, 0.1, ..., 1) were prepared by coprecipitation of mixed oxalates and subsequent thermal treatment at 1473, 1173, or 1073 K in air; they were then analyzed at room temperature both by synchrotron X-ray diffraction and μ-Raman spectroscopy. Two structural models were adopted to fit the experimental data, namely, a fluoritic one, resembling the CeO2 structure at low RE content, and a hybrid one at higher RE content, intermediate between the CeO2 and the RE2O3 structures. Two main transitions were detected along the compositional range: (a) an RE-dependent transition at the boundary between the fluoritic and the hybrid regions, of a chemical nature; (b) an RE-independent transition within the hybrid region at \~{}0.5, having a purely geometrical nature. The presence of two finely interlaced F- and C-based structures within the hybrid region was confirmed, and hints of their composition were obtained by μ-Raman spectroscopy. The obtained results indicate a possible explanation for the non-Vegard behavioral trend of the cell parameters.}, issn = {0020-1669}, doi = {10.1021/acs.inorgchem.5b00395}, url = {https://doi.org/10.1021/acs.inorgchem.5b00395}, author = {Cristina Artini and Marcella Pani and Maria Maddalena Carnasciali and Maria Teresa Buscaglia and Jasper Rikkert Plaisier and Giorgio Andrea Costa} } @article {750, title = {Structural properties of Sm-doped ceria electrolytes at the fuel cell operating temperatures}, journal = {Solid State Ionics}, volume = {315}, 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 = {85-91}, abstract = {A high temperature structural study (673{\textendash}1073K) was performed by means of synchrotron x-ray diffraction and μ-Raman spectroscopy on several compositions belonging to the Ce1-xSmxO2-x/2 system with the aim to investigate the crystallographic features of Sm-doped ceria electrolytes at the fuel cell operating temperatures; ionic conductivity of samples with x ranging between 0.1 and 0.4 was measured too in order to correlate the main structural features with transport properties. A slight shift toward lower x values of the fluorite-based/hybrid region boundary is observed with increasing temperature; moreover, the coefficient of thermal expansion reveals a strong slope change close to x=0.3, which represents the crossover composition between the two atomic arrangements. The presence of C-structured RE2O3 nanodomains within the fluorite structure starting from x~0.2 is revealed by μ-Raman spectroscopy and confirmed by the behaviour of total conductivity. The ordering effect exerted at each temperature by the Sm-vacancies aggregates on the fluorite structure within the hybrid region influences the behaviour of both the intensity and the full width at half maximum of the Raman signal typical of the CeO2 structure. The obtained results are discussed in comparison to the ones deriving from the Gd-doped ceria system.}, issn = {0167-2738}, doi = {10.1016/j.ssi.2017.12.009}, url = {http://www.sciencedirect.com/science/article/pii/S0167273817304800}, author = {C. Artini and M. M. Carnasciali and M. Viviani and S. Presto and J. R. Plaisier and G. A. Costa and M. Pani} } @article {788, title = {Structural requirements of manganese oxides for methane oxidation: XAS spectroscopy and transition-state studies}, journal = {Applied Catalysis B: Environmental}, volume = {229}, 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 = {52-62}, issn = {09263373}, doi = {10.1016/j.apcatb.2018.02.007}, url = {https://linkinghub.elsevier.com/retrieve/pii/S0926337318301115}, author = {Xiuyun Wang and Yi Liu and Yangyu Zhang and Tianhua Zhang and Huazhen Chang and Yongfan Zhang and Lilong Jiang} } @article {793, title = {Structure and magnetic properties of Ba5Ce1.25Mn3.75O15, a new 10H-polytype in the Ba{\textendash}Ce{\textendash}Mn{\textendash}O system}, journal = {Journal of Solid State Chemistry}, volume = {198}, 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 = {186-191}, issn = {00224596}, doi = {10.1016/j.jssc.2012.10.004}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0022459612006512}, author = {Mario A. Mac{\'\i}as and Olivier Mentr{\'e} and Silviu Colis and Gabriel J. Cuello and Gilles H. Gauthier} } @article {885, title = {Sunshine to Petrol: A Metal Oxide-Based Thermochemical Route to Solar Fuels}, number = {SAND2009-4579A}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, author = {Albuquerque Sandia National Laboratories and James E. Miller and Richard B. Diver Jr. and Nathan Phillip Siegel and Eric Coker and Andrea Ambrosini and Daniel E. Dedrick and Mark D. Allendorf and Anthony H. McDaniel and Gary L Kellogg and Roy E. Hogan Jr. and Ken S. Chen and Ellen B. Stechel} } @article {779, title = {Surface structure of coherently strained ceria ultrathin films}, journal = {Physical Review B}, volume = {94}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, issn = {2469-9950, 2469-9969}, doi = {10.1103/PhysRevB.94.205420}, url = {https://link.aps.org/doi/10.1103/PhysRevB.94.205420}, author = {Yezhou Shi and Kevin H. Stone and Zixuan Guan and Matteo Monti and Chuntian Cao and Farid El Gabaly and William C. Chueh and Michael F. Toney} } @article {802, title = {Thermodynamic modeling of the hybrid sulfur (HyS) cycle for hydrogen production}, journal = {Fluid Phase Equilibria}, volume = {460}, 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 = {175-188}, abstract = {We have developed a comprehensive thermodynamic model for the ternary system sulfur dioxide~+~sulfuric acid~+~water based on a previously published thermodynamic model of the aqueous sulfuric acid system using the symmetric electrolyte NRTL (eNRTL) activity coefficient model. The eNRTL binary interaction parameters and the chemical equilibrium constants are regressed from experimental SO2 solubility data in aqueous sulfuric acid solutions. The model accurately represents all thermodynamic properties including vapor-liquid equilibrium, liquid-liquid equilibrium, calorimetric properties, and speciation over a wide acid concentration range, from pure water to pure sulfuric acid and pure sulfur dioxide, and temperatures from 273.15 to 393.15 K. The model should be very useful in supporting process research, development, and design of advanced water-splitting processes based on the hybrid sulfur (HyS) cycle.}, issn = {0378-3812}, doi = {10.1016/j.fluid.2017.12.025}, url = {http://www.sciencedirect.com/science/article/pii/S0378381217305095}, author = {Harnoor Kaur and Meng Wang and Maximilian B. Gorensek and Chau-Chyun Chen} } @article {947, title = {Thermodynamics of CeO2 thermochemical fuel production}, journal = {Energy \& Fuels}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {150126104600001}, issn = {0887-0624, 1520-5029}, doi = {10.1021/ef5019912}, url = {http://pubs.acs.org/doi/abs/10.1021/ef5019912}, author = {B. Bulfin and F. Call and M. Lange and O. L{\"u}bben and C. Sattler and R. Pitz-Paal and I. V. Shvets} } @article {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 {832, title = {Towards Solar Fuels from Water and CO 2}, journal = {ChemSusChem}, volume = {3}, 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 = {195-208}, issn = {18645631, 1864564X}, doi = {10.1002/cssc.200900289}, url = {http://doi.wiley.com/10.1002/cssc.200900289}, author = {Gabriele Centi and Siglinda Perathoner} } @article {888, title = {Two-step water splitting thermochemical cycle based on iron oxide redox pair for solar hydrogen production}, 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 = {1124-1133}, issn = {03605442}, doi = {10.1016/j.energy.2006.07.023}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0360544206001897}, author = {P Charvin and S Abanades and G Flamant and F Lemort} } @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} }