@article {795, title = {Development of High Performance Intermediate Temperature Proton-Conducting Solid Oxide Electrolysis Cells}, volume = {80}, year = {Submitted}, 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 = {167-173}, abstract = {Steam electrolysis by solid oxide fuel cell technology, known as SOEC, is considered one of the most efficient and cost effective options for hydrogen production from renewable sources. By using proton-conducting electrolyte, the SOEC operating temperature can be reduced from over 800oC to below 600oC due to higher conductivity and lower activation energy. Technical barriers associated with the conventional oxygen-ion conducting SOECs, such as hydrogen separation from water, oxidation of steam electrode, and instability of oxygen electrode, can be largely mitigated. In this report, an intermediate temperature (500-600oC) electrolysis technology was developed where a novel proton-conductor and a triple-conducting oxide were used as the electrolyte and oxygen electrode, respectively. The electrolysis cell demonstrated excellent performance at intermediate temperatures, promising a new prospective for next-generation steam electrolysis.}, doi = {10.1149/08009.0167ecst}, url = {http://ecst.ecsdl.org/content/80/9/167.short}, author = {Dong Ding and Wei Wu and Ting He} } @article {1136, title = {Comprehensive Evaluation for Protective Coatings: Optical, Electrical, Photoelectrochemical, and Spectroscopic Characterizations}, journal = {Frontiers in Energy Research}, volume = {9}, year = {2022}, month = {2022}, abstract = {Numerous efficient semiconductors suffer from instability in aqueous electrolytes. Strategies utilizing protective coatings have thus been developed to protect these photoabsorbers against corrosion while synergistically improving charge separation and reaction kinetics. Recently, various photoelectrochemical (PEC) protective coatings have been reported with suitable electronic properties to ensure low charge transport loss and reveal the fundamental photoabsorber efficiency. However, protocols for studying the critical figures of merit for protective coatings have yet to be established. For this reason, we propose four criteria for evaluating the performance of a protective coating for PEC water-splitting: stability, conductivity, optical transparency, and energetic matching. We then propose a flow chart that summarizes the recommended testing protocols for quantifying these four performance metrics. In particular, we lay out the stepwise testing protocols to evaluate the energetics matching at a semiconductor/coating/(catalyst)/liquid interface. Finally, we provide an outlook for the future benchmarking needs for coatings.}, keywords = {coating, energetics, performance evaluation, performance metrics, spectroscopy}, issn = {2296-598X}, doi = {10.3389/fenrg.2021.799776}, url = {https://www.frontiersin.org/article/10.3389/fenrg.2021.799776}, author = {Shen, Xin and Yanagi, Rito and Solanki, Devan and Su, Haoqing and Li, Zhaohan and Xiang, Cheng-Xiang and Hu, Shu} } @article {1138, title = {Crystallographic Effects of GaN Nanostructures in Photoelectrochemical Reaction}, journal = {Nano Letters}, volume = {22}, year = {2022}, note = {PMID: 35258977}, pages = {2236-2243}, keywords = {GaN; artificial photosynthesis; nanowire; photoelectrode; surface polarity}, doi = {10.1021/acs.nanolett.1c04220}, url = {https://doi.org/10.1021/acs.nanolett.1c04220}, author = {Xiao, Yixin and Vanka, Srinivas and Pham, Tuan Anh and Dong, Wan Jae and Sun, Yi and Liu, Xianhe and Navid, Ishtiaque Ahmed and Varley, Joel B. and Hajibabaei, Hamed and Hamann, Thomas W. and Ogitsu, Tadashi and Mi, Zetian} } @article {1142, title = {Intermediate Temperature Solid Oxide Cell with a Barrier Layer Free Oxygen Electrode and Phase Inversion Derived Hydrogen Electrode}, journal = {Journal of the Electrochemical Society}, volume = {169}, year = {2022}, month = {3}, keywords = {area specific resistance, cathode, electrical conductivity, intermediate temperature-operating solid oxide fuel cell, layered perovskite}, doi = {10.1149/1945-7111/ac565a}, author = {Zhang, Yongliang and Xu, Nansheng and Tang, Qiming and Huang, Kevin} } @article {1146, title = {Predicting Oxygen Off-Stoichiometry and Hydrogen Incorporation in Complex Perovskite Oxides}, journal = {Chemistry of Materials}, volume = {34}, year = {2022}, pages = {510-518}, keywords = {charge transfer resistance, Hydrogen Incorporation, Oxygen evolution reaction, Perovskite, Perovskite Oxides, Stoichiometry}, doi = {10.1021/acs.chemmater.0c04765}, url = {https://doi.org/10.1021/acs.chemmater.0c04765}, author = {Millican, Samantha L. and Deml, Ann M. and Papac, Meagan and Zakutayev, Andriy and O{\textquoteright}Hayre, Ryan and Holder, Aaron M. and Musgrave, Charles B. and Stevanovi{\'c}, Vladan} } @article {1149, title = {Spatially resolved performance and degradation in a perfluorinated anion exchange membrane fuel cell}, journal = {Electrochimica Acta}, volume = {406}, year = {2022}, pages = {139812}, abstract = {Anion exchange membrane fuel cells may enable future operation with non-precious metal-based catalysts. These systems have a delicate sensitivity to operating conditions such as humidification levels and the presence of CO2 in the air oxidant stream. We present spatially resolved in-situ performance results that shed light on phenomena that are unique to anion exchange membrane fuel cells. For cell construction, a highly conductive perfluorinated anion exchange polymer was used as the membrane and the material in powder form as the ionomer. Experiments were conducted to investigate the effects of humidification, fuel/oxidant concentration, and carbonation effects on the performance and its distribution in the cell. The results indicated that (i) dry conditions at the cathode have a stronger effect than at the anode on overall cell performance, (ii) performance significantly suffered when humidification was below 90\%, (iii) fuel and oxidant dilution effects lead mass-transport losses and were stronger than flow rate effects, (iv) CO2 in the cathode feed stream creates an equilibration disparity between the inlet and outlet sections and CO2 purging is affected by flooding conditions, and (v) after >500~h of operation, performance deteriorates predominantly at the inlet.}, keywords = {2+1D fuel cell model, Anion Exchange membranes, Cathode dry-out, CO poisoning, Fuel cell durability, Mass transport limitations, Segmented fuel cell}, issn = {0013-4686}, doi = {https://doi.org/10.1016/j.electacta.2021.139812}, url = {https://www.sciencedirect.com/science/article/pii/S0013468621020958}, author = {Ashutosh G. Divekar and Michael R. Gerhardt and Christopher M. Antunes and Luigi Osmieri and Ami C. Yang-Neyerlin and Adam Z. Weber and Bryan S. Pivovar and Guido Bender and Andrew M. Herring} } @article {1119, title = {Double-Site Substitution of Ce Into (Ba, Sr)MnO3 Perovskites for Solar Thermochemical Hydrogen Production}, journal = {ACS Energy Letters}, volume = {6}, year = {2021}, pages = {3037-3043}, keywords = {Combinatorial synthesis, High-throughput experiments, Perovskites}, doi = {https://doi.org/10.1021/acsenergylett.1c01214}, author = {S. J. Heo and M. Sanders and R. O{\textquoteright}Hayre and A. Zakutayev} } @article {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 {1161, title = {Multiple Reaction Pathways for the Oxygen Evolution Reaction May Contribute to IrO2 (110){\textquoteright}s High Activity}, journal = {Journal of The Electrochemical Society}, volume = {168}, year = {2021}, month = {02/2021}, pages = {024506}, abstract = {Density functional theory calculations in conjunction with statistical mechanical arguments are performed on the rutile IrO2 (110) facet in order to characterize multiple reaction pathways on the surface at the highest active limit (the stoichiometric surface with all metal sites available) and at the lowest active limit (the oxygen-terminated surface). Alternative pathways to the oxygen evolution reaction (OER) are found, with multiple pathways determined at each step of the four proton-coupled electron transfer reaction. Of particular interest is the detailed characterization of a co-adsorption pathway utilizing neighboring, adsorbed O, OH species in order to evolve oxygen; activation energies of this pathway are <0.5 eV and therefore easily surmountable at the high operating potentials of OER. We also determined that surface Ir atoms can potentially participate in deprotonating an OOH* intermediate; the activation energy to this is 0.67 eV on the oxygen-terminated surface. These theoretical findings explain in part the high activity present in iridium oxide catalysts and also provide insight into the mechanistic pathways available on metal oxide catalysts, which may require the concerted interaction of nearest neighbor co-adsorbates to produce chemicals of interest.}, keywords = {DFT modeling, Iridium oxide, Oxygen evolution}, doi = {10.1149/1945-7111/abdeea}, url = {https://doi.org/10.1149/1945-7111/abdeea}, author = {Mai-Anh Ha and Ross E. Larsen} } @article {1120, title = {Outstanding Properties and Performance of CaTi0.5Mn0.5O3{\textendash}δ for Solar-Driven Thermochemical Hydrogen Production}, journal = {Matter}, volume = {4}, year = {2021}, pages = {688-708}, keywords = {inorganic perovskite, oxygen non-stoichiometry, phase transition, solar fuel, thermo-kinetic limit, thermochemical hydrogen production, thermodynamic properties}, doi = {https://doi.org/10.1016/j.matt.2020.11.016}, author = {X. Qian and J. He and E. Mastronardo and B. Baldassarri and W. Yuan and C. Wolverton and S. M. Haile} } @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 {1127, title = {CeTi2O6{\textemdash}A Promising Oxide for Solar Thermochemical Hydrogen Production}, journal = {ACS Applied Materials \& Interfaces}, volume = {12}, year = {2020}, pages = {21521-21527}, keywords = {brannerite structure, Cerium based oxides, CeTi2O6, high thermal stability, large entropy of reduction, small reduction enthalpy}, doi = {CeTi2O6{\textemdash}A Promising Oxide for Solar Thermochemical Hydrogen Production}, author = {S. S. Naghavi and J. He and C. Wolverton} } @article {1170, title = {Emergent Degradation Phenomena Demonstrated on Resilient, Flexible, and Scalable Integrated Photoelectrochemical Cells}, journal = {Advanced Energy Materials}, volume = {10}, year = {2020}, pages = {2002706}, abstract = {Abstract Photoelectrochemical (PEC) water splitting provides a pathway to generate sustainable clean fuels using the two most abundant resources on Earth: sunlight and water. Currently, most of the successful models of PEC cells are still fabricated on small scales near 1 cm2, which largely limits the mass deployment of solar-fuel production. Here, the scale-up to 8 cm2 of an integrated PEC (IPEC) device is demonstrated and its performance compared to a 1 cm2 IPEC cell, using state-of-the-art iridium and platinum catalysts with III{\textendash}V photoabsorbers. The initial photocurrents at 1 sun are 8 and 7 mA cm-2 with degradation rates of 0.60 and 0.47 mA cm-2 day-1, during unbiased operation for the 1 and 8 cm2 devices, respectively. Evaluating under outdoor and indoor conditions at two U.S. National Laboratories reveals similar results, evidencing the reproducibility of this design{\textquoteright}s performance. Furthermore, the emerging degradation mechanisms during scale-up are investigated and the knowledge gained from this work will provide feedback to the broader community, since PEC device durability is a limiting factor in its potential future deployment.}, keywords = {durability, on-sun testing, PEC cell scale-up, reproducibility, water splitting}, doi = {https://doi.org/10.1002/aenm.202002706}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/aenm.202002706}, author = {Kistler, Tobias A. and Zeng, Guosong and Young, James L. and Weng, Lien-Chun and Aldridge, Chase and Wyatt, Keenan and Steiner, Myles A. and Solorzano Jr., Oscar and Houle, Frances A. and Toma, Francesca M. and Weber, Adam Z. and Deutsch, Todd G. and Danilovic, Nemanja} } @article {1126, title = {Favorable Redox Thermodynamics of SrTi0.5Mn0.5O3-δ in Solar Thermochemical Water Splitting}, journal = {Chemistry of Materials}, volume = {32}, year = {2020}, pages = {9335-9346}, keywords = {Cubic perovskite, Modeling, Perovskite, SrTi0.5Mn0.5O3-δ}, doi = {https://doi.org/10.1021/acs.chemmater.0c03278}, author = {X. Qian and J. He and E. Mastronardo and B. Baldassarri and C. Wolverton and S. M. Haile} } @article {1087, title = {Highly efficient and durable III{\textendash}V semiconductor-catalyst photocathodes via a transparent protection layer}, journal = {Sustainable Energy Fuels}, volume = {4}, year = {2020}, pages = {1437-1442}, abstract = {

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

}, doi = {10.1039/C9SE01264H}, url = {http://dx.doi.org/10.1039/C9SE01264H}, author = {Shinjae Hwang and James L. Young and Rachel Mow and Anders B. Laursen and Mengjun Li and Hongbin Yang and Philip E. Batson and Martha Greenblatt and Myles A. Steiner and Daniel Friedman and Todd G. Deutsch and Eric Garfunkel and G. Charles Dismukes} } @article {1124, title = {High-Throughput Analysis of Materials for Chemical Looping Processes}, journal = {Advanced Energy Materials}, volume = {10}, year = {2020}, keywords = {chemical looping, high-throughput screening, machine learning, redox catalysis}, doi = {https://doi.org/10.1002/aenm.202000685}, author = {N. R. Singstock and C. J. Bartel and A. M. Holder and C. B. Musgrave} } @article {1176, title = {Self-sustainable protonic ceramic electrochemical cells using a triple conducting electrode for hydrogen and power production}, journal = {Nature Communications}, volume = {11}, year = {2020}, month = {4}, keywords = {HTE; SOEC; Proton exchange membrane electrolysis cell; PrNi0.5Co0.5O3-δ perovskite}, doi = {10.1038/s41467-020-15677-z}, author = {Ding, Hanping and Wu, Wei and Jiang, Chao and Ding, Yong and Bian, Wenjuan and Hu, Boxun and Singh, Prabhakar and Orme, Christopher J. and Wang, Lucun and Zhang, Yunya and Ding, Dong} } @article {1180, title = {Water-Stable 1D Hybrid Tin(II) Iodide Emits Broad Light with 36\% Photoluminescence Quantum Efficiency}, journal = {Journal of the American Chemical Society}, volume = {142}, year = {2020}, note = {PMID: 32283025}, pages = {9028-9038}, keywords = {Modeling, PEC, Perovskites}, doi = {10.1021/jacs.0c03004}, url = {https://doi.org/10.1021/jacs.0c03004}, author = {Spanopoulos, Ioannis and Hadar, Ido and Ke, Weijun and Guo, Peijun and Sidhik, Siraj and Kepenekian, Mika{\"e}l and Even, Jacky and Mohite, Aditya D. and Schaller, Richard D. and Kanatzidis, Mercouri G.} } @article {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 {1084, title = {Dependence of interface energetics and kinetics on catalyst loading in a photoelectrochemical system}, journal = {Nano Research}, year = {2019}, abstract = {

Published on March 11th, 2019. Solar hydrogen production by the photoelectrochemical method promises a means to store solar energy. While it is generally understood that the process is highly sensitive to the nature of the interface between the semiconductor and the electrolyte, a detailed understanding of this interface is still missing. For instance, few prior studies have established a clear relationship between the interface energetics and the catalyst loading amount. Here we aim to study this relationship on a prototypical Si-based photoelectrochemical system. Two types of interfaces were examined, one with GaN nanowires as a protection layer and one without. It was found that when GaN was present, higher Pt loading (\> 0.1 μg/cm2) led to not only better water reduction (and, hence, hydrogen evolution) kinetics but also more favorable interface energetics for greater photovoltages. In the absence of the protection layer, by stark contrast, increased Pt loading exhibited no measurable influence on the interface energetics, and the main difference was observed only in the hydrogen evolution kinetics. The study sheds new light on the importance of interface engineering for further improvement of photoelectrochemical systems, especially concerning the role of catalysts and protection layers.

}, issn = {1998-0000}, doi = {10.1007/s12274-019-2346-3}, url = {https://doi.org/10.1007/s12274-019-2346-3}, author = {Yumin He and Srinivas Vanka and Tianyue Gao and Da He and Jeremy Espano and Yanyan Zhao and Qi Dong and Chaochao Lang and Yongjie Wang and Thomas W. Hamann and Zetian Mi and Dunwei Wang} } @article {1183, title = {Direct Deposition of Crystalline Ta3N5 Thin Films on FTO for PEC Water Splitting}, journal = {ACS Applied Materials \& Interfaces}, volume = {11}, year = {2019}, pages = {15457-15466}, keywords = {ALD, CVD, FTO, PEC, Photoanode, Ta3N5, Tantalum nitride}, doi = {10.1021/acsami.8b21194}, url = {https://doi.org/10.1021/acsami.8b21194}, author = {Hajibabaei, Hamed and Little, Daniel J. and Pandey, Ayush and Wang, Dunwei and Mi, Zetian and Hamann, Thomas W.} } @article {1081, title = {An In0.42Ga0.58N tunnel junction nanowire photocathode monolithically integrated on a nonplanar Si wafer}, journal = {Nano Energy}, volume = {57}, year = {2019}, pages = {405-413}, abstract = {

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

}, issn = {2211-2855}, doi = {10.1016/j.nanoen.2018.12.067}, url = {http://www.sciencedirect.com/science/article/pii/S2211285518309807}, author = {Yongjie Wang and Srinivas Vanka and Jiseok Gim and Yuanpeng Wu and Ronglei Fan and Yazhou Zhang and Jinwen Shi and Mingrong Shen and Robert Hovden and Zetian Mi} } @article {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 {1078, title = {The role of decomposition reactions in assessing first-principles predictions of solid stability}, journal = {npj Computational Materials}, volume = {5}, year = {2019}, pages = {4}, abstract = {

Published on January 4th, 2019. The performance of density functional theory approximations for predicting materials thermodynamics is typically assessed by comparing calculated and experimentally determined enthalpies of formation from elemental phases, ΔHf. However, a compound competes thermodynamically with both other compounds and their constituent elemental forms, and thus, the enthalpies of the decomposition reactions to these competing phases, ΔHd, determine thermodynamic stability. We evaluated the phase diagrams for 56,791 compounds to classify decomposition reactions into three types: 1. those that produce elemental phases, 2. those that produce compounds, and 3. those that produce both. This analysis shows that the decomposition into elemental forms is rarely the competing reaction that determines compound stability and that approximately two-thirds of decomposition reactions involve no elemental phases. Using experimentally reported formation enthalpies for 1012 solid compounds, we assess the accuracy of the generalized gradient approximation (GGA) (PBE) and meta-GGA (SCAN) density functionals for predicting compound stability. For 646 decomposition reactions that are not trivially the formation reaction, PBE (mean absolute difference between theory and experiment (MAD)\ =\ 70\ meV/atom) and SCAN (MAD\ =\ 59\ meV/atom) perform similarly, and commonly employed correction schemes using fitted elemental reference energies make only a negligible improvement (~2 meV/atom). Furthermore, for 231 reactions involving only compounds (Type 2), the agreement between SCAN, PBE, and experiment is within ~35\ meV/atom and is thus comparable to the magnitude of experimental uncertainty.

}, issn = {2057-3960}, doi = {10.1038/s41524-018-0143-2}, url = {https://www.nature.com/articles/s41524-018-0143-2}, author = {Christopher J. Bartel and Alan W. Weimer and Stephan Lany and Charles B. Musgrave and Aaron M. Holder} } @article {1093, title = {A Single-Junction Cathodic Approach for Stable Unassisted Solar Water Splitting}, journal = {Joule}, year = {2019}, abstract = {

Published in August 2019.

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

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

}, issn = {0024-9297}, doi = {10.1021/acs.macromol.8b02355}, url = {https://doi.org/10.1021/acs.macromol.8b02355}, author = {Yong Yeob Jeon and Sungmin Park and Junyoung Han and Sandip Maurya and Angela D. Mohanty and Ding Tian and Nayan Saikia and Michael A. Hickner and Chang Y. Ryu and Mark E. Tuckerman and Stephen J. Paddison and Yu Seung Kim and Chulsung Bae} } @article {1090, title = {Thin film photoelectrodes for solar water splitting}, journal = {Chemical Society Reviews}, volume = {48}, year = {2019}, pages = {2182-2215}, abstract = {

Published on April 1st, 2019. Photoelectrochemical (PEC) water splitting has been intensively studied in the past decades as a promising method for large-scale solar energy storage. Among the various issues that limit the progress of this field, the lack of photoelectrode materials with suitable properties in all aspects of light absorption, charge separation and transport, and charge transfer is a key challenge, which has attracted tremendous research attention. A large variety of compositions, in different forms, have been tested. This review aims to summarize efforts in this area, with a focus on materials-related considerations. Issues discussed by this review include synthesis, optoelectronic properties, charge behaviors and catalysis. In the recognition that thin-film materials are representative model systems for the study of these issues, we elected to focus on this form, so as to provide a concise and coherent account on the different strategies that have been proposed and tested. Because practical implementation is of paramount importance to the eventual realization of using solar fuel for solar energy storage, we pay particular attention to strategies proposed to address the stability and catalytic issues, which are two key factors limiting the implementation of efficient photoelectrode materials. To keep the overall discussion focused, all discussions were presented within the context of water splitting reactions. How the thin-film systems may be applied for fundamental studies of the water splitting chemical mechanisms and how to use the model system to test device engineering design strategies are discussed.

}, issn = {1460-4744}, doi = {10.1039/C8CS00868J}, url = {https://pubs.rsc.org/en/content/articlelanding/2019/cs/c8cs00868j}, author = {Yumin He and Thomas Hamann and Dunwei Wang} } @article {1071, title = {Unifying the Hydrogen Evolution and Oxidation Reactions Kinetics in Base by Identifying the Catalytic Roles of Hydroxyl-Water-Cation Adducts}, journal = {Journal of the American Chemical Society}, volume = {141}, year = {2019}, month = {02/2019}, pages = {3232-3239}, abstract = {

Published on February 20th, 2019. Despite the fundamental and practical significance of the hydrogen evolution and oxidation reactions (HER/HOR), their kinetics in base remain unclear. Herein, we show that the alkaline HER/HOR kinetics can be unified by the catalytic roles of the adsorbed hydroxyl (OHad)-water-alkali metal cation (AM+) adducts, on the basis of the observations that enriching the OHad abundance via surface Ni benefits the HER/HOR; increasing the AM+ concentration only promotes the HER, while varying the identity of AM+ affects both HER/HOR. The presence of OHad-(H2O)x-AM+ in the double-layer region facilitates the OHad removal into the bulk, forming OH{\textendash}-(H2O)x-AM+ as per the hard{\textendash}soft acid{\textendash}base theory, thereby selectively promoting the HER. It can be detrimental to the HOR as per the bifunctional mechanism, as the AM+ destabilizes the OHad, which is further supported by the CO oxidation results. This new notion may be important for alkaline electrochemistry.

}, issn = {0002-7863}, doi = {10.1021/jacs.8b13228}, url = {https://doi.org/10.1021/jacs.8b13228}, author = {Ershuai Liu and Jingkun Li and Li Jiao and Huong Thi Thanh Doan and Zeyan Liu and Zipeng Zhao and Yu Huang and K. M. Abraham and Sanjeev Mukerjee and Qingying Jia} } @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 {990, title = {Assessing the role of hydrogen in Fermi-level pinning in chalcopyrite and kesterite solar absorbers from first-principles calculations}, journal = {Journal of Applied Physics}, volume = {123}, 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 = {161408}, abstract = {

Publshed on March 7th, 2018. Understanding the impact of impurities in solar absorbers is critical to engineering high-performance in devices, particularly over extended periods of time. Here, we use hybrid functional calculations to explore the role of hydrogen interstitial (Hi) defects in the electronic properties of a number of attractive solar absorbers within the chalcopyrite and kesterite families to identify how this common impurity may influence device performance. Our results identify that Hi can inhibit the highly p-type conditions desirable for several higher-band gap absorbers and that H incorporation could detrimentally affect the open-circuit voltage (Voc) and limit device efficiencies. Additionally, we find that Hi can drive the Fermi level away from the valence band edge enough to lead to n-type conductivity in a number of chalcopyrite and kesterite absorbers, particularly those containing Ag rather than Cu. We find that these effects can lead to interfacial Fermi-level pinning that can qualitatively explain the observed performance in high-Ga content CIGSe solar cells that exhibit saturation in the Voc with increasing band gap. Our results suggest that compositional grading rather than bulk alloying, such as by creating In-rich surfaces, may be a better strategy to favorably engineering improved thin-film photovoltaics with larger-band gap absorbers.

}, issn = {0021-8979}, doi = {10.1063/1.5006272}, url = {https://aip.scitation.org/doi/10.1063/1.5006272}, author = {J. B. Varley and V. Lordi and T. Ogitsu and A. Deangelis and K. Horsley and N. Gaillard} } @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 {1195, title = {High performing triple-conductive Pr2NiO4+δ anode for proton-conducting steam solid oxide electrolysis cell }, journal = {Journal of Materials Chemistry A}, volume = {6}, year = {2018}, pages = {18057-18066}, abstract = {The development of proton-conducting solid oxide electrolysis cells for the intermediate-temperature range application is largely hindered by the limited choice of adequate anode materials. In this study, the popular solid oxide fuel cell cathode material Pr2NiO4+δ (PNO) is investigated as the anode for the electrolysis cell, considering its proton-conducting ability. The introduction of protons into the PNO lattice is confirmed through insertion-induced conductivity variation measurements. Good chemical compatibility is verified between PNO and BaZr0.2Ce0.6Y0.2O3-δ (BZCY) proton-conducting electrolyte. Excellent catalytic activity towards water splitting is observed for the PNO{\textendash}BZCY composite anode, 0.52 Ω cm2 for 550 {\textdegree}C, 0.057 Ω cm2 for 700 {\textdegree}C. The water-splitting process is disclosed by impedance spectroscopy measured under different conditions. Due to proton conduction in PNO, the PNO surface is activated for electrochemical reactions. The non-charge transfer processes account little to the electrode resistance. The performance of the PNO{\textendash}BZCY anode is determined by two charge transfer processes whose kinetics are governed the electrolyzing potential. This charge transfer-limiting nature is relatively benign since the electrode resistance has been found to exponentially reduce with increasing overpotential. Cathode-supported Ni{\textendash}BZCY//BZCY//PNO{\textendash}BZCY thin film electrolyte single cells are fabricated and characterized. \~{}95\% current efficiency is confirmed. At 700 {\textdegree}C, a current density of 977 mA cm-2 is achieved at a 1.3 V electrolyzing potential, e.g. 0.37 V overpotential, which is one of the best performances of proton-conducting steam electrolysis cells so far. The PNO{\textendash}BZCY anode accounts only for 16\% of the overall polarization resistance at 700 {\textdegree}C. These findings prove that the triple-conductive PNO is a promising anode material for proton-based steam electrolysis cells.}, keywords = {BaZr0.2Ce0.6Y0.2O3-δ, HTE, Pr2NiO4+δ, Protonic ceramic electrolysis cells, SOEC}, doi = {10.1039/C8TA04018D}, url = {http://dx.doi.org/10.1039/C8TA04018D}, author = {Li, Wenyuan and Guan, Bo and Ma, Liang and Hu, Shanshan and Zhang, Nan and Liu, Xingbo} } @article {1063, title = {Hydrogen Production: 3D Self-Architectured Steam Electrode Enabled Efficient and Durable Hydrogen Production in a Proton-Conducting Solid Oxide Electrolysis Cell at Temperatures Lower Than 600 {\textdegree}C (Adv. Sci. 11/2018)}, journal = {Advanced Science}, volume = {5}, year = {2018}, month = {2018}, pages = {1870070}, abstract = {

In article number 1800360, Dong Ding and co-workers report a self-architectured ultraporous 3D electrode for steam electrolysis at intermediate temperatures. The proton-conducting electrolysis cell using this steam electrode demonstrates highly efficient and durable hydrogen production below 600 {\textdegree}C, which is attributed to improved mass transfer and increased active reaction area, as well as the electrode reconstruction under operation conditions.

}, issn = {2198-3844}, doi = {10.1002/advs.201870070}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/advs.201870070}, author = {Wei Wu and Hanping Ding and Yunya Zhang and Yong Ding and Prashant Katiyar and Prasun K. Majumdar and Ting He and Dong Ding} } @article {798, title = {Low-Cost, Efficient, and Durable H2 Production by Photoelectrochemical Water Splitting with CuGa3Se5 Photocathodes}, journal = {ACS Applied Materials \& Interfaces}, volume = {10}, 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 = {19573-19579}, abstract = {

Published on June 13th, 2018. Photoelectrochemical (PEC) water splitting is an elegant method of converting sunlight and water into H2 fuel. To be commercially advantageous, PEC devices must become cheaper, more efficient, and much more durable. This work examines low-cost polycrystalline chalcopyrite films, which are successful as photovoltaic absorbers, for application as PEC absorbers. In particular, Cu{\textendash}Ga{\textendash}Se films with wide band gaps can be employed as top cell photocathodes in tandem devices as a realistic route to high efficiencies. In this report, we demonstrate that decreasing Cu/Ga composition from 0.66 to 0.31 in Cu{\textendash}Ga{\textendash}Se films increased the band gap from 1.67 to 1.86 eV and decreased saturated photocurrent density from 18 to 8 mA/cm2 as measured by chopped-light current{\textendash}voltage (CLIV) measurements in a 0.5 M sulfuric acid electrolyte. Buffer and catalyst surface treatments were not applied to the Cu{\textendash}Ga{\textendash}Se films, and they exhibited promising stability, evidenced by unchanged CLIV after 9 months of storage in air. Finally, films with Cu/Ga = 0.36 (approximately stoichiometric CuGa3Se5) and 1.86 eV band gaps had exceptional durability and continuously split water for 17 days (\~{}12 mA/cm2 at -1 V vs RHE). This is equivalent to \~{}17\ 200 C/cm2, which is a world record for any polycrystalline PEC absorber. These results indicate that CuGa3Se5 films are prime candidates for cheaply achieving efficient and durable PEC water splitting.

}, issn = {1944-8244}, doi = {10.1021/acsami.8b01447}, url = {https://doi.org/10.1021/acsami.8b01447}, author = {Christopher P. Muzzillo and W. Ellis Klein and Zhen Li and Alexander Daniel DeAngelis and Kimberly Horsley and Kai Zhu and Nicolas Gaillard} } @article {1076, title = {Physical descriptor for the Gibbs energy of inorganic crystalline solids and temperature-dependent materials chemistry}, journal = {Nature Communications}, volume = {9}, year = {2018}, month = {10/2018}, pages = {4168}, issn = {2041-1723}, doi = {10.1038/s41467-018-06682-4}, url = {https://www.nature.com/articles/s41467-018-06682-4}, author = {Christopher J. Bartel and Samantha L. Millican and Ann M. Deml and John R. Rumptz and William Tumas and Alan W. Weimer and Stephan Lany and Vladan Stevanovi{\'c} and Charles B. Musgrave and Aaron M. Holder} } @article {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 {1091, title = {Toward Practical Solar Hydrogen Production}, journal = {Chem}, volume = {4}, year = {2018}, month = {03/2018}, pages = {405-408}, abstract = {

Published on March 8th, 2018. Two articles recently published in Joule represent efforts in material discovery and new engineering for practical solar hydrogen production. Wong and colleagues improved the solar hydrogen production performance of Cu2ZnSnS4 by Cd substitution, and Domen and co-workers presented a panel design to take advantage of particulate Al-doped SrTiO3 photocatalysts for overall water splitting.

}, issn = {2451-9294}, doi = {10.1016/j.chempr.2018.02.013}, url = {http://www.sciencedirect.com/science/article/pii/S2451929418300743}, author = {Yumin He and Dunwei Wang} } @article {1092, title = {Wide Band Gap CuGa(S,Se)2 Thin Films on Transparent Conductive Fluorinated Tin Oxide Substrates as Photocathode Candidates for Tandem Water Splitting Devices}, journal = {The Journal of Physical Chemistry C}, volume = {122}, year = {2018}, month = {07/2018}, pages = {14304-14312}, abstract = {

Published on July 5th, 2018. The purpose of this work was to explore the potential of CuGa(S,Se)2 thin films as wide-EG top cell absorbers for photoelectrochemical (PEC) water splitting. A synthesis was developed on fluorinated tin oxide (FTO) photocathodes by converting copper-rich co-evaporated CuGaSe2 into CuGa(S,Se)2 via a post-deposition annealing. We found it necessary to first anneal CuGaSe2 at low-temperature in sulfur then at high-temperature in nitrogen to preserve the transparency and conductivity of the FTO. Using this two-step synthesis, we fabricated a 1.72 eV CuGa(S,Se)2 photocathode with a saturation current density and photocurrent onset potential of 10 mA/cm2 and -0.20 V versus reversible hydrogen electrode, respectively. However we found that the PEC performance and sub-EG transmittance, worsened with increasing copper content. Using flatband potential measurements and the Gerischer model, we show that divergences in PEC performance of CuGa(S,Se)2 photocathodes can be explained by differences in conduction band minimums and Fermi levels. We also explain that sub-EG transmittance is likely hampered by a defect band 100{\textendash}400 meV below EC. Additional external quantum efficiency measurements of a high-efficiency 1.1 eV Cu(In,Ga)Se2 photovoltaic driver, while shaded by the CuGa(S,Se)2 photocathode, yielded a short-circuit current density of 4.14 mA/cm2 revealing that CuGa(S,Se)2 shows promise as a top cell for PEC water splitting.

}, issn = {1932-7447}, doi = {10.1021/acs.jpcc.8b02915}, url = {https://doi.org/10.1021/acs.jpcc.8b02915}, author = {Alexander D. DeAngelis and Kimberly Horsley and Nicolas Gaillard} } @article {1030, title = {A Decade of Solid Oxide Electrolysis Improvements at DTU Energy}, journal = {ECS Transactions}, volume = {75}, year = {2017}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {3-14}, abstract = {Published on January 11th, 2017. Solid oxide electrolysis cells (SOECs) can efficiently convert electrical energy (e.g. surplus wind power) to energy stored in fuels such as hydrogen or other synthetic fuels. Performance and durability of the SOEC has increased orders of magnitudes within the last decade. This paper presents a short review of the R\&D work on SOEC single cells conducted at DTU Energy from 2005 to 2015. The SOEC improvements have involved increasing the of the oxygen electrode performance, elimination of impurities in the feed streams, optimization of processing routes, and fuel electrode structure optimization. All together, these improvements have led to a decrease in long-term degradation rate from ~40 \%/kh to ~0.4 \%/kh for steam electrolysis at -1 A/cm2, while the initial area specific resistance has been decreased from 0.44 Wcm2 to 0.15 Wcm2 at -0.5 A/cm2 and 750 {\textdegree}C.}, issn = {1938-6737, 1938-5862}, doi = {10.1149/07542.0003ecst}, url = {http://ecst.ecsdl.org/content/75/42/3}, author = {Anne Hauch and Karen Brodersen and Ming Chen and Christopher Graves and S{\o}ren H{\o}jgaard Jensen and Peter Stanley J{\o}rgensen and Peter Vang Hendriksen and Mogens Bjerg Mogensen and Simona Ovtar and Xiufu Sun} } @article {822, title = {A piezomicrobalance system for high-temperature mass relaxation characterization of metal oxides: A case study of Pr-doped ceria}, journal = {Journal of the American Ceramic Society}, volume = {100}, year = {2017}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {1161-1171}, abstract = {Published in March 2017.}, issn = {00027820}, doi = {10.1111/jace.14652}, url = {http://doi.wiley.com/10.1111/jace.14652}, author = {Philipp Simons and Ho-Il Ji and Timothy C. Davenport and Sossina M. Haile} } @article {759, title = {Point defects in Cu2ZnSnSe4 (CZTSe): Resonant X-ray diffraction study of the low-temperature order/disorder transition}, journal = {physica status solidi (b)}, volume = {254}, year = {2017}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {1700156}, abstract = {The interest in Cu2ZnSn(S,Se)4 (CZTS) for photovoltaic applications is motivated by similarities to Cu(In,Ga)Se2 while being comprised of non-toxic and earth abundant elements. However, CZTS suffers from a Voc deficit, where the Voc is much lower than expected based on the band gap, which may be the result of a high concentration of point-defects in the CZTS lattice. Recently, reports have observed a low-temperature order/disorder transition by Raman and optical spectroscopies in CZTS films and is reported to describe the ordering of Cu and Zn atoms in the CZTS crystal structure. To directly determine the level of Cu/Zn ordering, we have used resonant-XRD, a site, and element specific probe of long range order. We used CZTSe films annealed just below and quenched from just above the transition temperature; based on previous work, the Cu and Zn should be ordered and highly disordered, respectively. Our data show that there is some Cu/Zn ordering near the low temperature transition but significantly less than high chemical order expected from Raman. To understand both our resonant-XRD results and the Raman results, we present a structural model that involves antiphase domain boundaries and accommodates the excess Zn within the CZTS lattice.}, issn = {1521-3951}, doi = {10.1002/pssb.201700156}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/pssb.201700156}, author = {L. T. Schelhas and K. H. Stone and S. P. Harvey and D. Zakhidov and A. Salleo and G. Teeter and I. L. Repins and M. F. Toney} } @article {988, title = {Self-optimizing, highly surface-active layered metal dichalcogenide catalysts for hydrogen evolution}, journal = {Nature Energy}, volume = {6}, 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 = {17127}, author = {Yuanyue Liu and Jingjie Wu and Ken P Hackenberg and Y. Morris Wang and Yingchao Yang and Kunttal Keyshar and Jing Gu and Tadashi Ogitsu and Robert Vajtai and Jun Lou and Pulickel M. Ajayan and Brandon C. Wood and Boris I. Yakobson} } @article {978, title = {Solar photochemical{\textendash}thermal water splitting at 140 {\textdegree}C with Cu-loaded TiO 2}, journal = {Energy \& Environmental Science}, volume = {10}, year = {2017}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {628-640}, issn = {1754-5692, 1754-5706}, doi = {10.1039/C6EE02974D}, url = {http://xlink.rsc.org/?DOI=C6EE02974D}, author = {Son Docao and Agni Raj Koirala and Min Gyu Kim and In Chul Hwang and Mee Kyung Song and Kyung Byung Yoon} } @article {983, title = {Thermochemical CO 2 splitting using double perovskite-type Ba 2 Ca 0.66 Nb 1.34-x Fe x O 6-δ}, journal = {Journal of Materials Chemistry A}, volume = {5}, year = {2017}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {6874-6883}, issn = {2050-7488, 2050-7496}, doi = {10.1039/C6TA10285A}, url = {http://xlink.rsc.org/?DOI=C6TA10285A}, author = {Suresh Mulmi and Haomin Chen and Azfar Hassan and Jose F. Marco and Frank J. Berry and Farbod Sharif and Peter R. Slater and Edward P. L. Roberts and Stefan Adams and Venkataraman Thangadurai} } @article {979, title = {Thermodynamics of paired charge-compensating doped ceria with superior redox performance for solar thermochemical splitting of H 2 O and CO 2}, journal = {Journal of Materials Chemistry A}, volume = {5}, year = {2017}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {19476-19484}, issn = {2050-7488, 2050-7496}, doi = {10.1039/C7TA05824A}, url = {http://xlink.rsc.org/?DOI=C7TA05824A}, author = {Marie Hoes and Christopher L. Muhich and Roger Jacot and Greta R. Patzke and Aldo Steinfeld} } @article {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 {1035, title = {Current developments in reversible solid oxide fuel cells}, journal = {Renewable and Sustainable Energy Reviews}, volume = {61}, 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 = {155-174}, abstract = {Published on August 1st, 2016. Solid Oxide Fuel Cells (SOFC) and Solid Oxide Electrolyte Cells (SOEC) are often considered precluded mainly by their high cost, even when several technical issues have been continuously tackled over the past decades. Our energetic matrix is essentially based on finite fuel sources, which involve the emission of environmentally hazardous pollutants. Nevertheless, now there are several feasible and profitable benign routes for energy generation through solid oxide cells development, mainly for cells capable to produce energy and store it employing hydrogen as energy carrier. Those cells act reversibly as fuel or electrolyzer systems, which may be integrated in hybrid renewable energy plants and may be referred to as Reversible Solid Oxide Fuel Cells (RSOFC). In this article, the operation principles of SOEC and SOFC and the current state of the electrolyte, fuel and oxygen electrodes has been reviewed and discussed in detail. Each major section is divided into materials families, including manufacturing issues. Novel materials and processing techniques are currently in development and are summarized here. Moreover, key-points are suggested to overcome the known drawbacks and to improve the performance and economic feasibility in order to enhance the commercialization of RSOFC technology.}, issn = {1364-0321}, doi = {10.1016/j.rser.2016.03.005}, url = {http://www.sciencedirect.com/science/article/pii/S1364032116002409}, author = {Sergio Yesid G{\'o}mez and Dachamir Hotza} } @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 {963, title = {Extreme high temperature redox kinetics in ceria: Exploration of the transition from gas-phase to material-kinetic limitations}, journal = {Phys. Chem. Chem. Phys.}, volume = {18}, year = {2016}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {21554-21561}, abstract = {*The authors use electrical conductivity relaxation to measure intrinsic redox kinetics of CeO2 under STC-relevant conditions. This approach is unique to the field and demonstrates unequivocally that transport effects can confound kinetic measurements.}, issn = {1463-9076, 1463-9084}, doi = {10.1039/C6CP01935H}, url = {http://xlink.rsc.org/?DOI=C6CP01935H}, author = {Ho-Il Ji and Timothy C. Davenport and Chirranjeevi Balaji Gopal and Sossina M. Haile} } @article {786, title = {Diverse structures of mixed-metal oxides containing rare earths and their magnetic properties}, journal = {Journal of the Ceramic Society of Japan}, volume = {123}, 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 = {845-852}, issn = {1348-6535, 1882-0743}, doi = {10.2109/jcersj2.123.845}, url = {https://www.jstage.jst.go.jp/article/jcersj2/123/1441/123_JCSJ-R15088/_article/-char/ja/}, author = {Yukio Hinatsu} } @article {859, title = {A general framework for the assessment of solar fuel technologies}, journal = {Energy Environ. Sci.}, 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 = {126-157}, issn = {1754-5692, 1754-5706}, doi = {10.1039/C4EE01958J}, url = {http://xlink.rsc.org/?DOI=C4EE01958J}, author = {Jeffrey A. Herron and Jiyong Kim and Aniruddha A. Upadhye and George W. Huber and Christos T. Maravelias} } @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 {954, title = {Perovskite promoted iron oxide for hybrid water-splitting and syngas generation with exceptional conversion}, journal = {Energy Environ. Sci.}, 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 = {535-539}, issn = {1754-5692, 1754-5706}, doi = {10.1039/C4EE03431G}, url = {http://xlink.rsc.org/?DOI=C4EE03431G}, author = {Feng He and Fanxing Li} } @article {811, title = {Ceria{\textendash}zirconia solid solutions (Ce1{\textendash}xZrxO2-δ, x<=0.2) for solar thermochemical water splitting: A thermodynamic study}, journal = {Chemistry of Materials}, volume = {26}, 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 = {6073-6082}, abstract = {Published on October 28th, 2014.}, issn = {0897-4756, 1520-5002}, doi = {10.1021/cm503131p}, url = {http://pubs.acs.org/doi/abs/10.1021/cm503131p}, author = {Yong Hao and Chih-Kai Yang and Sossina M. Haile} } @article {838, title = {Analysis and improvement of a high-efficiency solar cavity reactor design for a two-step thermochemical cycle for solar hydrogen production from water}, journal = {Solar Energy}, volume = {97}, year = {2013}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {26-38}, abstract = {Published in November 2013.}, issn = {0038092X}, doi = {10.1016/j.solener.2013.07.032}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0038092X13003071}, author = {Anis Houaijia and Christian Sattler and Martin Roeb and Matthias Lange and Stefan Breuer and Jan Peter S{\"a}ck} } @article {915, title = {High-temperature isothermal chemical cycling for solar-driven fuel production}, journal = {Physical Chemistry Chemical Physics}, volume = {15}, 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 = {17084}, issn = {1463-9076, 1463-9084}, doi = {10.1039/c3cp53270d}, url = {http://xlink.rsc.org/?DOI=c3cp53270d}, author = {Yong Hao and Chih-Kai Yang and Sossina M. Haile} } @article {813, title = {Ce0.67Cr0.33O2.11: A New Low-Temperature O2 Evolution Material and H2 Generation Catalyst by Thermochemical Splitting of Water}, journal = {Chemistry of Materials}, volume = {22}, year = {2010}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {762-768}, abstract = {Published on February 9th, 2010.}, issn = {0897-4756, 1520-5002}, doi = {10.1021/cm9013305}, url = {http://pubs.acs.org/doi/abs/10.1021/cm9013305}, author = {Preetam Singh and M. S. Hegde} } @article {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 {831, title = {Innovative Solar Thermochemical Water Splitting}, number = {SAND2008-0878}, year = {2008}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, url = {http://energiaypesca.net/biblioteca/Biblio_2/Diver\%20Sandia.pdf}, author = {Richard B. Diver and Nathan P. Siegel and Timothy A. Moss and James E. Miller and Lindsey Evans and Roy E. Hogan and Mark D. Allendorf and John N. Stuecker and Darryl L. James} } @article {891, title = {Solar thermochemical water-splitting ferrite-cycle heat engines}, journal = {Journal of Solar Energy Engineering}, volume = {130}, year = {2008}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {041001(1)-041001(8)}, issn = {01996231}, doi = {10.1115/1.2969781}, url = {http://link.aip.org/link/JSEEDO/v130/i4/p041001/s1\&Agg=doi}, author = {Richard B. Diver and James E. Miller and Mark D. Allendorf and Nathan P. Siegel and Roy E. Hogan} } @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 {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 {854, title = {Design principles for metal oxide redox materials for solar-driven isothermal fuel production}, journal = {Advanced Energy Materials}, volume = {5}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {1401082}, issn = {16146832}, doi = {10.1002/aenm.201401082}, url = {http://doi.wiley.com/10.1002/aenm.201401082}, author = {Ronald Michalsky and Venkatesh Botu and Cory M. Hargus and Andrew A. Peterson and Aldo Steinfeld} } @article {1020, title = {Durable Membrane Electrode Assemblies for Proton Exchange Membrane Electrolyzer Systems Operating at High Current Densities}, journal = {Electrochimica Acta}, volume = {210}, 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 = {502-511}, abstract = {High efficiencies, wide operation range and rapid response time have motivated the recent interest in proton exchange membrane (PEM) electrolysis for hydrogen generation with surplus electricity. However, degradation at high current densities and the associated mechanism has not been thoroughly explored so far. In this work, membrane electrode assemblies (MEA) from different suppliers are aged in a commercial PEM electrolyzer (2.5Nm3H2h--1), operating up to 4Acm--2 for more than 750h. In all cases, the cell voltage (Ecell) decreases during the testing period. Interestingly, the cells with Ir-black anodes exhibit the highest performance with the lowest precious metal loading (1mgcm-2). Electrochemical impedance spectroscopy (EIS) shows a progressive decrease in the specific exchange current, while the ohmic resistance decreases when doubling the nominal current density. This effect translates into an enhancement of cell efficiency at high current densities. However, Ir concurrently leaches out and diffuses into the membrane. No decrease in membrane thickness is observed at the end of the tests. High current densities do not lead to lowering the performance of the PEM electrolyzer over time, although MEA components degrade, in particular the anode.}, issn = {0013-4686}, doi = {10.1016/j.electacta.2016.04.164}, url = {http://www.sciencedirect.com/science/article/pii/S0013468616310167}, author = {P. Lettenmeier and R. Wang and R. Abouatallah and S. Helmly and T. Morawietz and R. Hiesgen and S. Kolb and F. Burggraf and J. Kallo and A. S. Gago and K. A. Friedrich} } @article {944, title = {Efficient Splitting of CO 2 in an Isothermal Redox Cycle Based on Ceria}, 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 = {140401120148005}, issn = {0887-0624, 1520-5029}, doi = {10.1021/ef402492e}, url = {http://pubs.acs.org/doi/abs/10.1021/ef402492e}, author = {Luke J. Venstrom and Robert M. De Smith and Yong Hao and Sossina M. Haile and Jane H. Davidson} } @article {1026, title = {Electrocatalysis in water electrolysis with solid polymer electrolyte}, journal = {Electrochimica Acta}, volume = {48}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {3945-3952}, abstract = {Powders of IrO2 were used as anode catalysts in water electrolysis cells with solid polymer electrolyte (SPE). The catalyst was prepared by a pyrolysis process in a nitrate melt at 340{\textdegree}C and then annealed at different temperatures from 440 to 540{\textdegree}C. The catalyst materials were applied to an electrode membrane assembly (MEA) and studied in situ in an electrolysis cell using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and stationary current density{\textendash}potential relations. The impedance results clearly show that the non-annealed material possesses the highest electrocatalytic activity and that this activity deteriorates with increasing annealing temperature. The electrical conductivity, however, increases by increasing annealing temperature. Optimum annealing conditions were found at 490{\textdegree}C, where the total polarisation reaches a minimum in the high current density range (1{\textendash}2 A cm-2), at the actual conditions. Increased crystallinity and size of the particles with increasing annealing temperature was observed by transmission electron microscopy (TEM). A very high electrochemical performance was obtained in a water electrolysis cell using IrO2 on the anode side and Pt on Vulcan XC-72 on the cathode side, corresponding to a current density of 1 A cm-2 at 1.60 V.}, issn = {0013-4686}, doi = {10.1016/j.electacta.2003.04.001}, url = {http://www.sciencedirect.com/science/article/pii/S0013468603005334}, author = {Egil Rasten and Georg Hagen and Reidar Tunold} } @article {932, title = {Enhanced Oxidation Kinetics in Thermochemical Cycling of CeO 2 through Templated Porosity}, journal = {The Journal of Physical Chemistry C}, volume = {117}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {1692-1700}, issn = {1932-7447, 1932-7455}, doi = {10.1021/jp309247c}, url = {http://pubs.acs.org/doi/abs/10.1021/jp309247c}, author = {Stephen G. Rudisill and Luke J. Venstrom and Nicholas D. Petkovich and Tingting Quan and Nicholas Hein and Daniel B. Boman and Jane H. Davidson and Andreas Stein} } @article {997, title = {Evaluation of proton-conducting membranes for use in a sulfur dioxide depolarized electrolyzer}, journal = {Journal of Power Sources}, volume = {195}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {2823-2829}, abstract = {The chemical stability, sulfur dioxide transport, ionic conductivity, and electrolyzer performance have been measured for several commercially available and experimental proton exchange membranes (PEMs) for use in a sulfur dioxide depolarized electrolyzer (SDE). The SDEs function is to produce hydrogen by using the Hybrid Sulfur (HyS) Process, a sulfur-based electrochemical/thermochemical hybrid cycle. Membrane stability was evaluated using a screening process where each candidate PEM was heated at 80{\textdegree}C in 60wt\% H2SO4 for 24h. Following acid exposure, chemical stability for each membrane was evaluated by FTIR using the ATR sampling technique. Membrane SO2 transport was evaluated using a two-chamber permeation cell. SO2 was introduced into one chamber whereupon SO2 transported across the membrane into the other chamber and oxidized to H2SO4 at an anode positioned immediately adjacent to the membrane. The resulting current was used to determine the SO2 flux and SO2 transport. Additionally, membrane electrode assemblies (MEAs) were prepared from candidate membranes to evaluate ionic conductivity and selectivity (ionic conductivity vs. SO2 transport) which can serve as a tool for selecting membranes. MEAs were also performance tested in a HyS electrolyzer measuring current density vs. a constant cell voltage (1V, 80{\textdegree}C in SO2 saturated 30wt\% H2SO4). Finally, candidate membranes were evaluated considering all measured parameters including SO2 flux, SO2 transport, ionic conductivity, HyS electrolyzer performance, and membrane stability. Candidate membranes included both PFSA and non-PFSA polymers and polymer blends of which the non-PFSA polymers, BPVE-6F and PBI, showed the best selectivity.}, issn = {0378-7753}, doi = {10.1016/j.jpowsour.2009.11.031}, url = {http://www.sciencedirect.com/science/article/pii/S0378775309020394}, author = {Mark C. Elvington and Hector Colon-Mercado and Steve McCatty and Simon G. Stone and David T. Hobbs} } @article {1017, title = {Experimental study on porous current collectors of PEM electrolyzers}, journal = {International Journal of Hydrogen Energy}, volume = {37}, 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 = {7418-7428}, abstract = {Experimental study on proton exchange membrane (PEM) electrolyzer was carried out focusing on the effect of pore structural properties of current collectors, such as porosity and pore diameter. Various titanium (Ti)-felt substrates with different porosities and pore diameters (measured by capillary flow porometry) were used as the anode current collector. Results show that when the mean pore diameter of the current collector was larger than 10μm, the electrolysis performance improved with decreasing pore diameter. In contrast, changes in porosity had no significant effect on the cell performance when the porosity exceeded 0.50. The flow pattern of two-phase flow in the flow channel was discussed in terms of its relationship to bubble size and to pore diameter of the current collector. Finally, correlation between the calculated membrane resistance and the measured pore diameter of the current collectors suggest that larger bubbles generated from larger pores tend to become long bubbles in the channel, thus hindering the water supply to the membrane.}, issn = {0360-3199}, doi = {10.1016/j.ijhydene.2012.01.095}, url = {http://www.sciencedirect.com/science/article/pii/S0360319912001917}, author = {Hiroshi Ito and Tetsuhiko Maeda and Akihiro Nakano and Chul Min Hwang and Masayoshi Ishida and Atsushi Kato and Tetsuya Yoshida} } @article {984, title = {Giant onsite electronic entropy enhances the performance of ceria for water splitting}, journal = {Nature Communications}, volume = {8}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, issn = {2041-1723}, doi = {10.1038/s41467-017-00381-2}, url = {http://www.nature.com/articles/s41467-017-00381-2}, author = {S. Shahab Naghavi and Antoine A. Emery and Heine A. Hansen and Fei Zhou and Vidvuds Ozolins and Chris Wolverton} } @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 {1019, title = {High-durability titanium bipolar plate modified by electrochemical deposition of platinum for unitized regenerative fuel cell (URFC)}, 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 = {1950-1956}, abstract = {The electrochemical deposition of platinum on a titanium bipolar plate (Pt/Ti) was studied for applications in a unitized regenerative fuel cell (URFC). Platinum deposition on the titanium plate was carried out in the platinum precursor solution (1.8gdm-3) at constant acidity (pH 1.0) and temperature (90{\textdegree}C). The pre-treatment of the titanium plate and the applied deposition current density were optimized to obtain uniform deposition of platinum on the titanium plate. New bipolar plates were prepared using the optimized deposition process and were used in a URFC. Electrochemical deposition of platinum on the titanium plate can effectively prohibit the formation of a passive oxide layer and corrosion on the surface of the bipolar plate, leading to lower resistance and better performance. In addition, the stability of URFC performance after the operation of the cell at 2.0V for 1h was significantly improved by the platinum deposition on the titanium bipolar plate. This improvement was mainly due to reduced corrosion on the surface of the bipolar plate.}, issn = {0378-7753}, doi = {10.1016/j.jpowsour.2009.10.002}, url = {http://www.sciencedirect.com/science/article/pii/S0378775309017352}, author = {Ho-Young Jung and Sheng-Yang Huang and Branko N. Popov} } @article {887, title = {High-flux solar-driven thermochemical dissociation of CO2 and H2O using nonstoichiometric ceria}, journal = {Science}, volume = {330}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {1797-1801}, issn = {0036-8075, 1095-9203}, doi = {10.1126/science.1197834}, url = {http://www.sciencemag.org/cgi/doi/10.1126/science.1197834}, author = {W. C. Chueh and C. Falter and M. Abbott and D. Scipio and P. Furler and S. M. Haile and A. Steinfeld} } @article {969, title = {High-throughput computational screening of perovskites for thermochemical water splitting applications}, journal = {Chemistry of Materials}, volume = {28}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {5621-5634}, abstract = {*The authors use high throughput DFT to screen all possible simple, binary ABO3 perovskite formulations for gas-splitting favorability. It is the first demonstration of DFT applied to STC materials in this manner and points to the potential future impacts of computational chemistry in this field.}, issn = {0897-4756, 1520-5002}, doi = {10.1021/acs.chemmater.6b01182}, url = {http://pubs.acs.org/doi/abs/10.1021/acs.chemmater.6b01182}, author = {Antoine A. Emery and James E. Saal and Scott Kirklin and Vinay I. Hegde and Chris Wolverton} } @article {758, title = {Incommensurate Sinusoidal Oxygen Modulations in Layered Manganites La 1 - x Sr 1 + x MnO 4 ( x >= 0.5 )}, journal = {Physical Review Letters}, volume = {109}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, issn = {0031-9007, 1079-7114}, doi = {10.1103/PhysRevLett.109.107202}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.109.107202}, author = {Joaqu{\'\i}n Garc{\'\i}a and Javier Herrero-Mart{\'\i}n and Gloria Sub{\'\i}as and Javier Blasco and J. S. Andreu and M. Concepci{\'o}n S{\'a}nchez} } @article {847, title = {Intrinsic material properties dictating oxygen vacancy formation energetics in metal oxides}, journal = {The Journal of Physical Chemistry Letters}, volume = {6}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {1948-1953}, abstract = {*The authors use first-principles calculations to explore the relationship between the energy required to form an oxygen vacancy and intrinsic bulk material properties. They derive a simple model that predicts vacancy formation energy at substantially reduced computational cost which may facilitate high throughput computational screening of STC materials.}, issn = {1948-7185}, doi = {10.1021/acs.jpclett.5b00710}, url = {http://pubs.acs.org/doi/abs/10.1021/acs.jpclett.5b00710}, author = {Ann M. Deml and Aaron M. Holder and Ryan P. O{\textquoteright}Hayre and Charles B. Musgrave and Vladan Stevanovi{\'c}} } @article {855, title = {Investigation of long term reactive stability of ceria for use in solar thermochemical cycles}, journal = {Energy}, volume = {89}, 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 = {924-931}, issn = {03605442}, doi = {10.1016/j.energy.2015.06.041}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0360544215007975}, author = {Nathan R. Rhodes and Michael M. Bobek and Kyle M. Allen and David W. Hahn} } @article {850, title = {Kinetics and thermodynamics of H2O dissociation on reduced CeO2(111)}, journal = {The Journal of Physical Chemistry C}, volume = {118}, 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 = {27402-27414}, issn = {1932-7447, 1932-7455}, doi = {10.1021/jp508666c}, url = {http://pubs.acs.org/doi/abs/10.1021/jp508666c}, author = {Heine A. Hansen and Christopher Wolverton} } @article {1010, title = {Low-Cost and Durable Bipolar Plates for Proton Exchange Membrane Electrolyzers}, journal = {Scientific Reports}, volume = {7}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {44035}, abstract = {Cost reduction and high efficiency are the mayor challenges for sustainable H2 production via proton exchange membrane (PEM) electrolysis. Titanium-based components such as bipolar plates (BPP) have the largest contribution to the capital cost. This work proposes the use of stainless steel BPPs coated with Nb and Ti by magnetron sputtering physical vapor deposition (PVD) and vacuum plasma spraying (VPS), respectively. The physical properties of the coatings are thoroughly characterized by scanning electron, atomic force microscopies (SEM, AFM); and X-ray diffraction, photoelectron spectroscopies (XRD, XPS). The Ti coating (50 μm) protects the stainless steel substrate against corrosion, while a 50-fold thinner layer of Nb decreases the contact resistance by almost one order of magnitude. The Nb/Ti-coated stainless steel bipolar BPPs endure the harsh environment of the anode for more than 1000 h of operation under nominal conditions, showing a potential use in PEM electrolyzers for large-scale H2 production from renewables.}, issn = {2045-2322}, doi = {10.1038/srep44035}, url = {https://www.nature.com/articles/srep44035}, author = {P. Lettenmeier and R. Wang and R. Abouatallah and B. Saruhan and O. Freitag and P. Gazdzicki and T. Morawietz and R. Hiesgen and A. S. Gago and K. A. Friedrich} } @article {792, title = {Magnetic and electrical properties of quadruple perovskites with 12 layer structures Ba4LnM3O12 (Ln=rare earths; M=Ru, Ir): The role of metal{\textendash}metal bonding in perovskite-related oxides}, journal = {Journal of Solid State Chemistry}, volume = {183}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {1962-1969}, issn = {00224596}, doi = {10.1016/j.jssc.2010.06.023}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0022459610002744}, author = {Yuki Shimoda and Yoshihiro Doi and Makoto Wakeshima and Yukio Hinatsu} } @article {959, title = {Maximizing fuel production rates in isothermal solar thermochemical fuel production}, journal = {Applied Energy}, volume = {183}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {1098-1111}, issn = {03062619}, doi = {10.1016/j.apenergy.2016.09.012}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0306261916313162}, author = {Timothy C. Davenport and Chih-Kai Yang and Christopher J. Kucharczyk and Michael J. Ignatowich and Sossina M. Haile} } @article {874, title = {Modeling the Direct Solar Conversion of CO 2 to CO and O 2}, journal = {Industrial \& Engineering Chemistry Research}, volume = {43}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {2446-2453}, issn = {0888-5885, 1520-5045}, doi = {10.1021/ie030745o}, url = {http://pubs.acs.org/doi/abs/10.1021/ie030745o}, author = {Ralph J. Price and David A. Morse and Steven L. Hardy and Thomas H. Fletcher and Scott C. Hill and Reed J. Jensen} } @article {925, title = {Modification of CeO2 on the redox property of Fe2O3}, journal = {Materials Letters}, volume = {93}, 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 = {129-132}, issn = {0167577X}, doi = {10.1016/j.matlet.2012.09.039}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0167577X12013195}, author = {Kongzhai Li and Masaaki Haneda and Zhenhua Gu and Hua Wang and Masakuni Ozawa} } @article {768, title = {M-edge x-ray absorption spectroscopy of 4f instabilities in rare-earth systems (invited)}, journal = {Journal of Applied Physics}, volume = {55}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {1910-1915}, issn = {0021-8979}, doi = {10.1063/1.333517}, url = {https://aip.scitation.org/doi/abs/10.1063/1.333517}, author = {G. Kaindl and G. Kalkowski and W. D. Brewer and B. Perscheid and F. Holtzberg} } @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 {897, title = {Oxidation reaction kinetics for the steam-iron process in support of hydrogen production}, journal = {International Journal of Hydrogen Energy}, volume = {36}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {15125-15135}, issn = {03603199}, doi = {10.1016/j.ijhydene.2011.08.074}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0360319911019951}, author = {R.C. Stehle and M.M. Bobek and R. Hooper and D.W. Hahn} } @article {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 {916, title = {Reactivity of doped ceria-based mixed oxides for solar thermochemical hydrogen generation via two-step water-splitting cycles}, journal = {Energy \& Fuels}, volume = {27}, 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 = {6068-6078}, issn = {0887-0624, 1520-5029}, doi = {10.1021/ef4014373}, url = {http://pubs.acs.org/doi/abs/10.1021/ef4014373}, author = {Alex Le Gal and St{\'e}phane Abanades and Nicolas Bion and Thierry Le Mercier and Virginie Harl{\'e}} } @article {953, title = {The reduction and oxidation of ceria: A natural abundance triple oxygen isotope perspective}, journal = {Geochimica et Cosmochimica Acta}, volume = {159}, 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 = {220-230}, issn = {00167037}, doi = {10.1016/j.gca.2015.03.030}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0016703715001829}, author = {Justin Hayles and Huiming Bao} } @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 {833, title = {Solar energy combined with chemical reactive systems for the production and storage of sustainable energy. A review of thermodynamic principles}, journal = {The Journal of Chemical Thermodynamics}, volume = {46}, 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 = {99-108}, issn = {00219614}, doi = {10.1016/j.jct.2011.08.023}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0021961411002990}, author = {Andreas Heintz} } @article {956, title = {Solar fuel processing efficiency for ceria redox cycling using alternative oxygen partial pressure reduction methods}, journal = {Energy}, volume = {88}, 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 = {667-679}, issn = {03605442}, doi = {10.1016/j.energy.2015.06.006}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0360544215007069}, author = {Meng Lin and Sophia Haussener} } @article {870, title = {Splitting CO2 with a ceria-based redox cycle in a solar-driven thermogravimetric analyzer}, journal = {AIChE Journal}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, issn = {00011541}, doi = {10.1002/aic.15501}, url = {http://doi.wiley.com/10.1002/aic.15501}, author = {M. Takacs and S. Ackermann and A. Bonk and M. Neises-von Puttkamer and Ph. Haueter and J. R. Scheffe and U. F. Vogt and A. Steinfeld} } @article {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 {950, title = {Thermodynamic and kinetic assessments of strontium-doped lanthanum manganite perovskites for two-step thermochemical water splitting}, journal = {Journal of Materials Chemistry A}, 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 = {2050-7488, 2050-7496}, doi = {10.1039/C4TA02694B}, url = {http://xlink.rsc.org/?DOI=C4TA02694B}, author = {Chih-Kai Yang and Yoshihiro Yamazaki and Aykut Aydin and Sossina M. Haile} } @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 {938, title = {Tunable oxygen vacancy formation energetics in the complex perovskite oxide SrxLa1{\textendash}xMnyAl1{\textendash}yO3}, journal = {Chemistry of Materials}, volume = {26}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {6595-6602}, issn = {0897-4756, 1520-5002}, doi = {10.1021/cm5033755}, url = {http://pubs.acs.org/doi/abs/10.1021/cm5033755}, author = {Ann M. Deml and Vladan Stevanovi{\'c} and Aaron M. Holder and Michael Sanders and Ryan O{\textquoteright}Hayre and Charles B. Musgrave} } @article {1031, title = {Understanding the Current-Voltage Behavior of High Temperature Solid Oxide Fuel Cell Stacks}, journal = {Journal of The Electrochemical Society}, volume = {164}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {F1460-F1470}, abstract = {High temperature solid oxide fuel cell (SOFC) stacks are highly efficient and environmentally friendly electrochemical systems, which convert the chemical energy of fuel gases with oxygen from air directly into electrical energy. During operation of SOFC stacks under system operating conditions pronounced temperature and fuel gas composition gradients along the cell area and along the height of the stack occur. Therefore, in contrast to SOFC cells, the electrochemical behavior of SOFC stacks is much more complex and has not sufficiently been studied. Specially, a shortcoming exists in terms of understanding the homogeneity, performance loss mechanisms, and various resistances and overvoltages within the stack repeat components. Therefore, this paper focuses on the improvement of the understanding and of the interpretation of different current-voltage curves of solid oxide fuel cell stack repeat units. Three different cases are discussed: repeat units with high power performance, with high cell contact resistance and with high fuel utilization. The stacks were investigated by current-voltage curves, electrochemical impedance spectroscopy and gas analysis. In order to understand the electrochemical behavior of these three cases both experimental and modeling results are presented, compared and discussed.}, issn = {0013-4651, 1945-7111}, doi = {10.1149/2.1541713jes}, url = {http://jes.ecsdl.org/content/164/13/F1460}, author = {M. Lang and C. Bohn and M. Henke and G. Schiller and C. Willich and F. Hauler} }