@article {1155, title = {Elucidating the Role of Hydroxide Electrolyte on Anion-Exchange-Membrane Water Electrolyzer Performance}, journal = {Journal of The Electrochemical Society}, volume = {168}, year = {2021}, month = {05/2021}, pages = {054522}, abstract = {Many solid-state devices, especially those requiring anion conduction, often add a supporting electrolyte to enable efficient operation. The prototypical case is that of anion-exchange-membrane water electrolyzers (AEMWEs), where addition of an alkali metal solution improves performance. However, the specific mechanism of this performance improvement is currently unknown. This work investigates the functionality of the alkali metal solution in AEMWEs using experiments and mathematical models. The results show that additional hydroxide plays a key role not only in ohmic resistance of the membrane and catalyst layer but also in the reaction kinetics. The modeling suggests that the added liquid electrolyte creates an additional electrochemical interface with the electrocatalyst that provides ion-transport pathways and distributes product gas bubbles; the total effective electrochemical active surface area in the cell with 1 M KOH is 5 times higher than that of the cell with DI water. In the cell with 1 M KOH, more than 80\% of the reaction current is associate with the liquid electrolyte. These results indicate the importance of high pH of electrolyte and catalyst/electrolyte interface in AEMWEs. The understanding of the functionality of the alkali metal solution presented in this study should help guide the design and optimization of AEMWEs.}, keywords = {alkali metal solutions, anion-exchange-membrane water electrolyzers, Energy Sciences, energy storage, liquid electrolyte, solid-state devices}, issn = {0013-4651}, doi = {10.1149/1945-7111/ac0019}, author = {Jiangjin Liu and Zhenye Kang and Dongguo Li and Magnolia Pak and Shaun M. Alia and Cy Fujimoto and Guido Bender and Yu Seung Kim and Adam Z. Weber} } @article {1158, title = {Influence of Supporting Electrolyte on Hydroxide Exchange Membrane Water Electrolysis Performance: Anolyte}, journal = {Journal of The Electrochemical Society}, volume = {168}, year = {2021}, month = {08/2021}, pages = {084512}, abstract = {Hydroxide-exchange-membrane water electrolysis (HEMWE) is an emerging hydrogen-production pathway that combines many advantages of incumbent alkaline water electrolysis (AWE) and proton-exchange-membrane water electrolysis (PEMWE). Advancement in HEMWE has been accelerated with the development of stable and conductive hydroxide exchange membranes (HEMs) and a more comprehensive understanding of alkaline gas-evolving kinetics. However, performance and durability without supporting electrolytes (SELs) remain inferior to PEMWE and AWE and little is known about the role and impact of the SELs. This study investigates the effects of SELs used as anolyte solutions in HEMWEs including cation-type, anion-type, SEL conductivity and pH, presence of carbonates and increased cation/OH- ratios on cell voltage and stability. We report our findings that (i) cell potential and high-frequency resistance did not correlate with anolyte SEL conductivity, (ii) cation-type influences cell voltage at low current densities (<50 mA cm-2) as predicted by half-cell measurements, (iii) increased cation/OH- ratio causes increased overpotentials, and (iv) carbonates are exchanged in the HEM but removed via self-purging at high current density. Overall, this study concludes that concentrated KOH is still the best SEL.}, keywords = {hydrogen production pathway, Hydroxide exchange membrane, incumbent alkaline, proton exchange membrane, supporting electrolytes, water electrolysis}, doi = {10.1149/1945-7111/ac1dcd}, url = {https://doi.org/10.1149/1945-7111/ac1dcd}, author = {Aleksandr Kiessling and Julie C. Fornaciari and Grace Anderson and Xiong Peng and Andreas Gerstmayr and Michael R. Gerhardt and Samuel McKinney and Alexey Serov and Yu Seung Kim and Barr Zulevi and Adam Z. Weber and Nemanja Danilovic} } @article {1159, title = {Layer-structured triple-conducting electrocatalyst for water-splitting in protonic ceramic electrolysis cells: Conductivities vs. activity}, journal = {Journal of Power Sources}, volume = {495}, year = {2021}, pages = {229764}, abstract = {Electron, proton and oxygen-triple-conducting materials are becoming the dominant steam electrode candidate to break the rate limit on the water-splitting reaction that throttles the performance of protonic ceramic electrolysis cells (PCECs). In this study, based on Pr2NiO4+δ Ruddlesden-Popper phase, we manipulate these conductivities by Pr-site Ba substitution to probe the correlation of each conductivity with the kinetics of the elementary reaction steps. It is found that the proton conductivity is vital to sustain an extended active surface area for faster adsorption of reactants and desorption of products. The effect of oxygen conductivity is surprisingly found insignificant in the water-splitting reaction. On the contrary, surface oxygen removal is discovered as the most rate-limiting process. The electronic conductivity is not a direct limiting factor. However, an electron transfer process between the current collector and the electrode junction could introduce extra resistance that is perceptible at a high operating temperature range. The best water-splitting activity is obtained on a proton conductivity/oxygen surface desorption capability well-balanced sample after Ba substitution. As a result, a water-splitting reaction resistance of 0.022 Ωcm2, a current density of 1.96 A/cm2 at 700~{\textdegree}C is achieved on Pr1.7Ba0.3NiO4+δ, one of the best performances for PCECs.}, keywords = {Hydrogen generation, Protonic ceramic electrolysis cells, Ruddlesden-popper phase, Triple-conducting electrocatalyst, Water-splitting}, issn = {0378-7753}, doi = {https://doi.org/10.1016/j.jpowsour.2021.229764}, url = {https://www.sciencedirect.com/science/article/pii/S0378775321003050}, author = {Wenyuan Li and Bo Guan and Tao Yang and Zhongqiu Li and Wangying Shi and Hanchen Tian and Liang Ma and Thomas L. Kalapos and Xingbo Liu} } @article {1174, title = {Mg $\less$sub$\greater$x$\less$/sub$\greater$ Zn$\less$sub$\greater$1-x $\less$/sub$\greater$O contact to CuGa$\less$sub$\greater$3$\less$/sub$\greater$Se$\less$sub$\greater$5$\less$/sub$\greater$ absorber for photovoltaic and photoelectrochemical devices}, journal = {Journal of Physics: Energy}, volume = {3}, year = {2021}, month = {jan}, pages = {024001}, abstract = {CuGa3Se5 is a promising candidate material with wide band gap for top cells in tandem photovoltaic and photoelectrochemical (PEC) devices. However, traditional CdS contact layers used with other chalcopyrite absorbers are not suitable for CuGa3Se5 due to the higher position of its conduction band (CB) minimum. Mg x Zn1- x O (MZO) is a transparent oxide with adjustable band gap and CB position as a function of magnesium composition, but its direct application is hindered by CuGa3Se5 surface oxidation. Here, MZO is investigated as a contact (n-type {\textquoteleft}buffer{\textquoteright} or {\textquoteleft}window{\textquoteright}) material to CuGa3Se5 absorbers pretreated in Cd2+ solution, and an onset potential close to 1 V vs reversible hydrogen electrode in 10 mM hexaammineruthenium (III) chloride electrolyte is demonstrated. The Cd2+ surface treatment changes the chemical composition and electronic structure of the CuGa3Se5 surface, as demonstrated by photoelectron spectroscopy measurements. The performance of CuGa3Se5 absorber with Cd2+ treated surface in the solid-state test structure depends on the Zn/Mg ratio in the MZO layer. The measured open circuit voltage of 925 mV is promising for tandem PEC water splitting with CuGa3Se5/MZO top cells.}, keywords = {Photocathode; PEC; Buffer layer; CuGaSe; MgZnO}, doi = {10.1088/2515-7655/abd3b3}, url = {https://doi.org/10.1088/2515-7655/abd3b3}, author = {Imran S Khan and Christopher P Muzzillo and Craig L Perkins and Andrew G Norman and James L Young and Nicolas Gaillard and Andriy Zakutayev} } @article {1113, title = {Performance and Durability of Anion Exchange Membrane Water Electrolyzers Using Down-Selected Polymer Electrolytes}, journal = {Journal of Materials Chemistry A}, year = {2021}, pages = {22670-22683}, doi = {https://doi.org/10.1039/D1TA06869E}, author = {A. R. Motz and D. Li and A. Keane and L. D. Manriquez and E. J. Park and S. Maurya and H. Chung and C. Fujimoto and J. Jeon and M. K. Pagels and C. Bae and K. E. Ayers and Y. S. Kim} } @article {1080, title = {Addressing the Stability Gap in Photoelectrochemistry: Molybdenum Disulfide Protective Catalysts for Tandem III{\textendash}V Unassisted Solar Water Splitting}, journal = {ACS Energy Letters}, year = {2020}, month = {07/2020}, pages = {2631-2640}, doi = {10.1021/acsenergylett.0c01132}, url = {https://doi.org/10.1021/acsenergylett.0c01132}, author = {Micha Ben-Naim and Reuben J. Britto and Chase W. Aldridge and Rachel Mow and Myles A. Steiner and Adam C. Nielander and Laurie A. King and Daniel J. Friedman and Todd G. Deutsch and James L. Young and Thomas F. Jaramillo} } @article {1168, title = {Deconvolution of Water-Splitting on the Triple-Conducting Ruddlesden{\textendash}Popper-Phase Anode for Protonic Ceramic Electrolysis Cells}, journal = {ACS Applied Materials \& Interfaces}, volume = {12}, year = {2020}, note = {PMID: 33079527}, pages = {49574-49585}, keywords = {atomic layer, proton conductors, relaxation time distribution, ruddlesden-popper phase, steam electrolysis, triple-conducting}, doi = {10.1021/acsami.0c12987}, url = {https://doi.org/10.1021/acsami.0c12987}, author = {Tian, Hanchen and Li, Wenyuan and Ma, Liang and Yang, Tao and Guan, Bo and Shi, Wangying and Kalapos, Thomas L. and Liu, Xingbo} } @article {1170, title = {Emergent Degradation Phenomena Demonstrated on Resilient, Flexible, and Scalable Integrated Photoelectrochemical Cells}, journal = {Advanced Energy Materials}, volume = {10}, year = {2020}, pages = {2002706}, abstract = {Abstract Photoelectrochemical (PEC) water splitting provides a pathway to generate sustainable clean fuels using the two most abundant resources on Earth: sunlight and water. Currently, most of the successful models of PEC cells are still fabricated on small scales near 1 cm2, which largely limits the mass deployment of solar-fuel production. Here, the scale-up to 8 cm2 of an integrated PEC (IPEC) device is demonstrated and its performance compared to a 1 cm2 IPEC cell, using state-of-the-art iridium and platinum catalysts with III{\textendash}V photoabsorbers. The initial photocurrents at 1 sun are 8 and 7 mA cm-2 with degradation rates of 0.60 and 0.47 mA cm-2 day-1, during unbiased operation for the 1 and 8 cm2 devices, respectively. Evaluating under outdoor and indoor conditions at two U.S. National Laboratories reveals similar results, evidencing the reproducibility of this design{\textquoteright}s performance. Furthermore, the emerging degradation mechanisms during scale-up are investigated and the knowledge gained from this work will provide feedback to the broader community, since PEC device durability is a limiting factor in its potential future deployment.}, keywords = {durability, on-sun testing, PEC cell scale-up, reproducibility, water splitting}, doi = {https://doi.org/10.1002/aenm.202002706}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/aenm.202002706}, author = {Kistler, Tobias A. and Zeng, Guosong and Young, James L. and Weng, Lien-Chun and Aldridge, Chase and Wyatt, Keenan and Steiner, Myles A. and Solorzano Jr., Oscar and Houle, Frances A. and Toma, Francesca M. and Weber, Adam Z. and Deutsch, Todd G. and Danilovic, Nemanja} } @article {1172, title = {Highly quaternized polystyrene ionomers for high performance anion exchange membrane water electrolysers}, journal = {Nature Energy}, volume = {5}, year = {2020}, month = {3}, keywords = {LTE; AEM electrolysis; Novel ionomer}, doi = {10.1038/s41560-020-0577-x}, author = {Kim, Yu Seung and Li, Dongguo and Park, Eun Joo and Wenlei, Zhu and Qiurong, Shi and Zhou, Yang and Tian, Hangyu and Lin, Yuehe and Serov, Alexey and Zulevi, Barr and Baca, Ehren Donel and Fujimoto, Cy and Chung, Hoon} } @article {1178, title = {Tungsten oxide-coated copper gallium selenide sustains long-term solar hydrogen evolution}, journal = {Sustainable Energy \& Fuels}, volume = {5}, year = {2020}, month = {12}, keywords = {CuGaSe, durability, PEC, Photocathode, Pt hydrogen evolution catalyst, Tungsten oxide protective coating}, doi = {10.1039/d0se00487a}, author = {Palm, David W. and Muzzillo, Christopher P. and Ben-Naim, Micha and Khan, Imran and Gaillard, Nicolas and Jaramillo, Thomas F.} } @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 {796, title = {Integrated Membrane-Electrode-Assembly Photoelectrochemical Cell under Various Feed Conditions for Solar Water Splitting}, journal = {Journal of The Electrochemical Society}, volume = {166}, year = {2019}, note = {

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

}, pages = {H3020-H3028}, issn = {0013-4651, 1945-7111}, doi = {10.1149/2.0041905jes}, url = {http://jes.ecsdl.org/lookup/doi/10.1149/2.0041905jes}, author = {Tobias A. Kistler and David Larson and Karl Walczak and Peter Agbo and Ian D. Sharp and Adam Z. Weber and Nemanja Danilovic} } @article {1067, title = {Investigation of porous transport layer parameters for proton exchange membrane water electrolysis}, year = {2019}, abstract = {
  1. Presentation
  2. Investigation of porous transport layer parameters for proton exchange membrane water electrolysis
  3. Presenter
    Zhenye Kang
  4. Contributor
    Shaun M. Alia
  5. Contributor
    James L. Young
  6. Contributor
    Guido Bender
  7. LTE
  8. 2019
  9. Hilton Atlanta, Atlanta, GA, USA
  10. 236th ECS Meeting
  11. http://ma.ecsdl.org/content/MA2019-02/37/1747.short
  12. 11/6/2019, 10:47:45 AM
  13. 12/6/2019, 1:28:14 PM
Abstract
Published on October 17th, 2019 Hydrogen production through proton exchange membrane water electrolysis (PEMWE) is regarded as a very promising technology that offers a highly efficient and robust path to store electrical energy in form of hydrogen and further enables the integration of renewable energy into the electrical grid 1-3. The total cell voltage of a single PEM water electrolyzer cell is composed of the open circuit voltage, activation overpotential, diffusion overpotential, and ohmic loss overpotential 4. The total voltage of the cell can be expressed as Eq(1) 5. V=V_OCV+V_act+V_ohm+V_diff (1) Where V_OCV is the Nernst potential which is also called the reversible voltage and can be calculated from the Nernst equation or Gibbs free energy, V_act is the activation overpotential due to the electrochemical reaction and it represents the overpotential to drive the electron transfer and electrochemical reaction kinetics as described by the Butler-Volmer model, V_ohm is the ohmic overpotential caused by the resistances of the electronic/ionic components and interfacial contact resistances, and V_diff is the diffusion overpotential related to mass transport. Porous transport layers (PTLs) are key components in PEMWE. They facilitate mass transport, thermal and electrical conduction, and are required to sustain a good contact with adjacent components 6-8. It is expected that various PTLs with different structures and wettability exhibit nonidentical performance in PEMWE. In this study, a general model is established to investigate the PTL parameters of four inherently different PTLs, including non-treated Toray paper, PTFE treated Toray paper, sintered titanium particles and Ti felt. SEM images highlighting the structures of these PTL materials are shown in Figure 1. The materials, which differed in thickness, porosity, material and composition were evaluated with identical MEAs over a range of operating conditions for model validation. The resulting data indicate that the hydrophobic additives in the Toray paper will decrease the PEMWE performance due to increased mass transport loss and ohmic loss. Ti felt with similar thickness and porosity as non-treated Toray paper showed slightly reduced performance due to its higher ohmic loss. Sintered Ti particle PTLs exhibit much higher ohmic resistance than Ti felt and nontreated Toray paper, which may be attributed to its significantly larger thickness and/or an increased contact resistance. The experimental data was employed to validate the MATLAB/Simulink model which enables the simulation of the contribution of each overpotential. The model was used to successfully describe the effects of PTFE loading on PEMWE performance, as shown in Figure 2. The hydrophobic treatment resulted, as expected, in detrimental performance effects. The diffusion loss of a 20\% PTFE treated Toray paper is significantly higher than that of the nontreated PTLs (Figure 2). The modeling results also indicate that the change of the wettability of the PTLs by hydrophobic additives/agents, impacted not only the diffusion loss significantly, but also affected the ohmic loss and activation loss. This was specifically detrimental to PEMWE cell performance when operating at high current densities. The model that was validated in this study can be used to predict the effects of key PTL parameters and utilized to optimize PEMWE performance.
}, url = {http://ma.ecsdl.org/content/MA2019-02/37/1747.short}, author = {Zhenye Kang and Shaun M. Alia and James L. Young and Guido Bender} } @article {1075, title = {Phase Identification of the Layered Perovskite CexSr2{\textendash}xMnO4 and Application for Solar Thermochemical Water Splitting}, journal = {Inorganic Chemistry}, volume = {58}, year = {2019}, pages = {7705-7714}, abstract = {

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

}, issn = {0020-1669}, doi = {10.1021/acs.inorgchem.8b03487}, url = {https://doi.org/10.1021/acs.inorgchem.8b03487}, author = {Debora R. Barcellos and Francisco G. Coury and Antoine Emery and Michael Sanders and Jianhua Tong and Anthony McDaniel and Christopher Wolverton and Michael Kaufman and Ryan O{\textquoteright}Hayre} } @article {704, title = {Phenyl Oxidation Impacts the Durability of Alkaline Membrane Water Electrolyzer}, journal = {ACS Applied Materials \& Interfaces}, volume = {11}, year = {2019}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {9696-9701}, abstract = {Published on March 13th, 2019. The durability of alkaline anion exchange membrane (AEM) electrolyzers is a critical requirement for implementing this technology in cost-effective hydrogen production. Here, we report that the electrochemical oxidation of the adsorbed phenyl group (found in the ionomer) on oxygen evolution catalysts produces phenol, which may cause performance deterioration in AEM electrolyzers. In-line 1H NMR kinetic analyses of phenyl oxidation in a model organic cation electrolyte shows that catalyst type significantly impacts the phenyl oxidation rate at an oxygen evolution potential. Density functional theory calculations show that the phenyl adsorption is a critical factor determining the phenyl oxidation. This research provides a path for the development of more durable AEM electrolyzers with components that can minimize the adverse impact induced by the phenyl group oxidation, such as the development of novel ionomers with fewer phenyl moieties or catalysts with less phenyl-adsorbing character.}, issn = {1944-8244}, doi = {10.1021/acsami.9b00711}, url = {https://doi.org/10.1021/acsami.9b00711}, author = {Dongguo Li and Ivana Matanovic and Albert S. Lee and Eun Joo Park and Cy Fujimoto and Hoon T. Chung and Yu Seung Kim} } @article {1070, title = {Synthesis of Aromatic Anion Exchange Membranes by Friedel{\textendash}Crafts Bromoalkylation and Cross-Linking of Polystyrene Block Copolymers}, journal = {Macromolecules}, volume = {52}, year = {2019}, pages = {2139-2147}, abstract = {

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

}, issn = {0024-9297}, doi = {10.1021/acs.macromol.8b02355}, url = {https://doi.org/10.1021/acs.macromol.8b02355}, author = {Yong Yeob Jeon and Sungmin Park and Junyoung Han and Sandip Maurya and Angela D. Mohanty and Ding Tian and Nayan Saikia and Michael A. Hickner and Chang Y. Ryu and Mark E. Tuckerman and Stephen J. Paddison and Yu Seung Kim and Chulsung Bae} } @article {1194, title = {Transition Metal Arsenide Catalysts for the Hydrogen Evolution Reaction}, journal = {The Journal of Physical Chemistry C}, volume = {123}, year = {2019}, pages = {24007-24012}, keywords = {Arsenide catalyst, CoAs, Hydrogen evolution catalyst, MoAs, Modeling, PEC}, doi = {10.1021/acs.jpcc.9b05738}, url = {https://doi.org/10.1021/acs.jpcc.9b05738}, author = {Gauthier, Joseph A. and King, Laurie A. and Stults, Faith Tucker and Flores, Raul A. and Kibsgaard, Jakob and Regmi, Yagya N. and Chan, Karen and Jaramillo, Thomas F.} } @article {776, title = {Cosputtered Calcium Manganese Oxide Electrodes for Water Oxidation}, journal = {Inorganic Chemistry}, volume = {57}, year = {2018}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {785-792}, abstract = {Published on January 16th, 2018.}, issn = {0020-1669, 1520-510X}, doi = {10.1021/acs.inorgchem.7b02717}, url = {http://pubs.acs.org/doi/10.1021/acs.inorgchem.7b02717}, author = {Hamed Simchi and Kayla A. Cooley and Jonas Ohms and Lingqin Huang and Philipp Kurz and Suzanne E. Mohney} } @article {1085, title = {Gallium nitride nanowire as a linker of molybdenum sulfides and silicon for photoelectrocatalytic water splitting}, journal = {Nature Communications}, volume = {9}, year = {2018}, month = {09/2018}, pages = {3856}, abstract = {

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

}, issn = {2041-1723}, doi = {10.1038/s41467-018-06140-1}, url = {https://www.nature.com/articles/s41467-018-06140-1}, author = {Baowen Zhou and Xianghua Kong and Srinivas Vanka and Sheng Chu and Pegah Ghamari and Yichen Wang and Nick Pant and Ishiang Shih and Hong Guo and Zetian Mi} } @article {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 {1008, title = {Anodic Behavior of the Aluminum Current Collector in Imide-Based Electrolytes: Influence of Solvent, Operating Temperature, and Native Oxide-Layer Thickness}, journal = {ChemSusChem}, volume = {10}, year = {2017}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {804-814}, abstract = {Published on February 22nd, 2017. The inability of imide salts to form a sufficiently effective passivation layer on aluminum current collectors is one of the main obstacles that limit their broad application in electrochemical energy-storage systems. However, under certain circumstances, the use of electrolytes with imide electrolyte salts in combination with the aluminum current collector is possible. In this contribution, the stability of the aluminum current collector in electrolytes containing either lithium bis(trifluoromethanesulfonyl) imide (LiTFSI) or lithium fluorosulfonyl-(trifluoromethanesulfonyl) imide (LiFTFSI) as conductive salt was investigated by electrochemical techniques, that is, cyclic voltammetry (CV) and chronocoulometry (CC) in either room-temperature ionic liquids or in ethyl methyl sulfone. In particular, the influence of the solvent, operating temperature, and thickness of the native oxide layer of aluminum on the pit formation at the aluminum current collector surface was studied by means of scanning electron microscopy. In general, a more pronounced aluminum dissolution and pit formation was found at elevated temperatures as well as in solvents with a high dielectric constant. An enhanced thickness of the native aluminum oxide layer increases the oxidative stability versus dissolution. Furthermore, we found a different reaction rate depending on dwell time at the upper cut-off potential for aluminum dissolution in TFSI- and FTFSI-based electrolytes during the CC measurements; the use of LiFTFSI facilitated the dissolution of aluminum compared to LiTFSI. Overall, the mechanism of anodic aluminum dissolution is based on: i) the attack of the Al2O3 surface by acidic species and ii) the dissolution of bare aluminum into the electrolyte, which, in turn, is influenced by the electrolyte{\textquoteright}s dielectric constant.}, issn = {1864-564X}, doi = {10.1002/cssc.201601636}, url = {http://onlinelibrary.wiley.com/doi/10.1002/cssc.201601636/abstract}, author = {Paul Meister and Xin Qi and Richard Kloepsch and Elisabeth Kr{\"a}mer and Benjamin Streipert and Martin Winter and Tobias Placke} } @article {980, title = {Perovskite oxides {\textendash} a review on a versatile material class for solar-to-fuel conversion processes}, 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 = {11983-12000}, issn = {2050-7488, 2050-7496}, doi = {10.1039/C7TA00987A}, url = {http://xlink.rsc.org/?DOI=C7TA00987A}, author = {Markus Kubicek and Alexander H. Bork and Jennifer L. M. Rupp} } @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} } @inbook {749, title = {Application of SR methods for the study of nanocomposite materials for Hydrogen Energy}, volume = {84}, year = {2016}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {397-406}, publisher = {Elsevier Science Bv}, organization = {Elsevier Science Bv}, address = {Amsterdam}, abstract = {This work summarizes results of synchrotron radiation (SR) studies of the real/defect structure of nanocrystalline/nanocomposite oxide materials, which determines their functional properties in hydrogen energy field as catalysts and mixed ionic electronic conductors (cathodes and anodes of solid oxide fuel cells, oxygen separation membranes). For nanocrystalline ceria-zirconia mixed oxide prepared via modified Pechini route using ethanol solution of reagents, a high spatial uniformity of cations distribution between domains along with the oxygen sublattice deficiency revealed by full-profile Rietveld refinement of SR diffraction data provide structure disordering enhancing oxygen mobility. For PrNi0.5Co0.5O3-delta - Ce0.9Y0.1O2-delta nanocomposite extensive transfer of Pr cations into fluorite domains generates a new path of fast oxygen diffusion along chains of Pr3+ - Pr4+ cations as directly proved by analysis of the unit cell relaxation after changing pO(2) in perfect agreement with data obtained by oxygen isotope heteroexchange. (C) 2016 The Authors. Published by Elsevier B.V.}, author = {V. A. Sadykov and S. N. Pavlova and Z. S. Vinokurov and A. N. Shmakov and N. F. Eremeev and Yu E. Fedorova and E. P. Yakimchuk and V. V. Kriventsov and V. A. Bolotov and Yu Yu Tanashev and E. M. Sadovskaya and S. V. Cherepanova and K. V. Zolotarev and N. A. Vinokurov and B. A. Knyazev} } @article {865, title = {Critical limitations on the efficiency of two-step thermochemical cycles}, journal = {Solar Energy}, volume = {123}, year = {2016}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {57-73}, abstract = {Published in January 2016. *The authors bring to attention the need for standardizing methods to evaluate material performance, and propose a modeling framework from which to accomplish this.}, issn = {0038092X}, doi = {10.1016/j.solener.2015.09.036}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0038092X15005228}, author = {Colby Jarrett and William Chueh and Cansheng Yuan and Yoshiaki Kawajiri and Kenneth H. Sandhage and Asegun Henry} } @article {961, title = {Reduction enthalpy and charge distribution of substituted ferrites and doped ceria for thermochemical water and carbon dioxide splitting with DFT+U}, journal = {Phys. Chem. Chem. Phys.}, volume = {18}, year = {2016}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {23587-23595}, issn = {1463-9076, 1463-9084}, doi = {10.1039/C6CP05073E}, url = {http://xlink.rsc.org/?DOI=C6CP05073E}, author = {D. A. Dimitrakis and N. I. Tsongidis and A. G. Konstandopoulos} } @article {1135, title = {Best Practices in Perovskite Solar Cell Efficiency Measurements. Avoiding the Error of Making Bad Cells Look Good}, journal = {Journal of Physical Chemistry Letters}, volume = {6}, year = {2015}, month = {03}, pages = {852-857}, keywords = {additive engineering, encapsulation, Perovskite, perovskite defects, perovskite degradation, perovskite solar cell, perovskite solar cell stability}, doi = {10.1021/acs.jpclett.5b00289}, author = {Christians, Jeffrey and Manser, Joseph and Kamat, Prashant} } @article {951, title = {Design of a Solar Reactor to Split CO2 Via Isothermal Redox Cycling of Ceria}, journal = {Journal of Solar Energy Engineering}, volume = {137}, year = {2015}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {031007}, url = {https://solarenergyengineering.asmedigitalcollection.asme.org/article.aspx?articleID=1920469}, author = {Roman Bader and Rohini Bala Chandran and Luke J. Venstrom and Stephen J. Sedler and Peter T. Krenzke and Robert M. De Smith and Aayan Banerjee and Thomas R. Chase and Jane H. Davidson and Wojciech Lipi{\'L} and } } @article {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 {946, title = {Perovskite La0.6Sr0.4Cr1-xCoxO3-δ solid solutions for solar-thermochemical fuel production: strategies to lower the operation temperature}, journal = {J. Mater. Chem. A}, volume = {3}, year = {2015}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {15546-15557}, issn = {2050-7488, 2050-7496}, doi = {10.1039/C5TA02519B}, url = {http://xlink.rsc.org/?DOI=C5TA02519B}, author = {A. H. Bork and M. Kubicek and M. Struzik and J. L. M. Rupp} } @article {860, title = {Surface controlled reduction kinetics of nominally undoped polycrystalline CeO 2}, journal = {Phys. Chem. Chem. Phys.}, volume = {17}, year = {2015}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {5849-5860}, issn = {1463-9076, 1463-9084}, doi = {10.1039/C4CP05742B}, url = {http://xlink.rsc.org/?DOI=C4CP05742B}, author = {Nicole Knoblauch and Lars D{\"o}rrer and Peter Fielitz and Martin Schm{\"u}cker and G{\"u}nter Borchardt} } @article {816, title = {Analytical Model of CeO 2 Oxidation and Reduction}, journal = {The Journal of Physical Chemistry C}, volume = {117}, year = {2013}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {24129-24137}, abstract = {Published on November 21st, 2013.}, issn = {1932-7447, 1932-7455}, doi = {10.1021/jp406578z}, url = {http://pubs.acs.org/doi/abs/10.1021/jp406578z}, author = {B. Bulfin and A. J. Lowe and K. A. Keogh and B. E. Murphy and O. L{\"u}bben and S. A. Krasnikov and I. V. Shvets} } @article {807, title = {Cobalt Ferrite in YSZ for Use as Reactive Material in Solar Thermochemical Water and Carbon Dioxide Splitting, Part II: Kinetic Modeling}, journal = {JOM}, year = {2013}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, abstract = {Published on October 8th, 2013.}, issn = {1047-4838, 1543-1851}, doi = {10.1007/s11837-013-0774-1}, url = {http://link.springer.com/10.1007/s11837-013-0774-1}, author = {Kyle M. Allen and Nick Auyeung and Nima Rahmatian and James F. Klausner and Eric N. Coker} } @article {824, title = {A Model of Transient Heat and Mass Transfer in a Heterogeneous Medium of Ceria Undergoing Nonstoichiometric Reduction}, journal = {Journal of Heat Transfer}, volume = {135}, year = {2013}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {052701}, abstract = {Published on April 11th, 2013.}, issn = {0022-1481}, doi = {10.1115/1.4023494}, url = {http://heattransfer.asmedigitalcollection.asme.org/article.aspx?doi=10.1115/1.4023494}, author = {Daniel J. Keene and Jane H. Davidson and Wojciech Lipi{\'n}ski} } @article {899, title = {Fuel production from CO2 using solar-thermal energy: system level analysis}, journal = {Energy \& Environmental Science}, volume = {5}, year = {2012}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {8417}, issn = {1754-5692, 1754-5706}, doi = {10.1039/c2ee21798h}, url = {http://xlink.rsc.org/?DOI=c2ee21798h}, author = {Jiyong Kim and Terry A. Johnson and James E. Miller and Ellen B. Stechel and Christos T. Maravelias} } @article {919, title = {Reimagining liquid transportation fuels : Sunshine to Petrol.}, number = {SAND2012-0307}, year = {2012}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, url = {http://www.osti.gov/servlets/purl/1035344/}, author = {James Edward Miller and Mark D. Allendorf and Andrea Ambrosini and Ken Shuang Chen and Eric Nicholas Coker and Daniel E. Dedrick and Richard B., Jr. Diver and Roy E., Jr. Hogan and Ivan Ermanoski and Terry Alan Johnson and Gary L. Kellog and Anthony H. McDaniel and Nathan Phillip Siegel and Chad Lynn Staiger and Ellen Beth Stechel} } @article {903, title = {Solar hydrogen: fuel of the near future}, journal = {Energy \& Environmental Science}, volume = {3}, year = {2010}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {279{\textendash}287}, url = {http://pubs.rsc.org/en/content/articlehtml/2010/ee/b923793n}, author = {M. Pagliaro and A. G. Konstandopoulos and R. Ciriminna and G. Palmisano} } @article {882, title = {Screening Analysis of Solar Thermochemical Hydrogen Concepts}, number = {SAND2008-1900}, 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} }, abstract = {A screening analysis was performed to identify concentrating solar power (CSP) concepts that produce hydrogen with the highest efficiency. Several CSP concepts were identified that have the potential to be much more efficient than today{\textquoteright}s low-temperature electrolysis technology. They combine a central receiver or dish with either a thermochemical cycle or high-temperature electrolyzer that operate at temperatures >600 oC. The solar-to-hydrogen efficiencies of the best central receiver concepts exceed 20\%, significantly better than the 14\% value predicted for low-temperature electrolysis.}, author = {Gregory J. Kolb and Richard B. Diver} } @article {762, title = {Determination of the Mechanism for Resonant Scattering in LaMnO 3}, journal = {Physical Review Letters}, volume = {96}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, issn = {0031-9007, 1079-7114}, doi = {10.1103/PhysRevLett.96.246405}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.96.246405}, author = {Q. Shen and I. S. Elfimov and P. Fanwick and Y. Tokura and T. Kimura and K. Finkelstein and R. Colella and G. A. Sawatzky} } @article {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 {775, title = {Effect of local coordination of Mn on Mn-L-2,L-3 edge electron energy loss spectrum}, journal = {JOURNAL OF APPLIED PHYSICS}, volume = {114}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {054906}, abstract = {The effects of the local coordination environment of Mn ions in perovskite manganese oxides on the Mn-L-2,L-3 edge electron energy loss (EEL) spectra was experimentally and theoretically investigated. The Mn-L-2,L-3 edge EEL spectra were observed for various perovskite manganese oxides, including YMnO3, LaMnO3, BaMnO3, SrMnO3, and CaMnO3, in which the Mn ions have different valence states and local coordination. The experiment revealed that the Mn L-3/L-2 ratio is influenced not only by the valence state but also by the local environment of the Mn ions. Furthermore, compared to the Mn-L-3/L-2 ratios of Mn3+ compounds, the Mn L-3/L-2 ratios of the Mn4+ compounds are found to be much more sensitive to local distortions. The ab-initio multiplet calculation of the Mn-L-2,L-3 edge EEL spectra revealed that the effects of local coordination on the spectral features are dependent on the local electronic structures of the Mn ions. These findings indicate that the valence state as well as the local environments of the Mn ions can be unraveled by combining experimental and theoretical investigations of Mn-L-2,L-3 edge EEL spectra. (C) 2013 AIP Publishing LLC.}, issn = {0021-8979}, doi = {10.1063/1.4817425}, author = {S Nishida and S Kobayashi and A Kumamoto and H Ikeno and T Mizoguchi and I Tanaka and Y Ikuhara and T Yamamoto} } @article {955, title = {On the efficiency of solar H2 and CO production via the thermochemical cerium oxide redox cycle: The option of inert-swept reduction}, 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 = {150206073859007}, issn = {0887-0624, 1520-5029}, doi = {10.1021/ef502601f}, url = {http://pubs.acs.org/doi/abs/10.1021/ef502601f}, author = {Peter T. Krenzke and Jane H. Davidson} } @article {1027, title = {Electrochemical Hydrogen Compression: Efficient Pressurization Concept Derived from an Energetic Evaluation}, journal = {Journal of The Electrochemical Society}, volume = {164}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {F1187-F1195}, abstract = {Electrochemical hydrogen compression is a potentially high efficient, low-maintenance and silent technology to produce high pressure hydrogen. A new pressure concept with increased compression efficiency, termed intermediate differential pressure polymer electrolyte water electrolysis is proposed. With slightly pressurized oxygen and a much higher hydrogen pressure, this pressure concept profits from the advantages of the lower gas crossover of differential (only hydrogen compressed) pressure water electrolysis and the improved oxygen evolution reaction kinetics with increasing pressure of balanced pressure operation. Data for gas pressures up to 100 MPa is modeled, based on experimental results up to 5 MPa, of the three pressure concepts and validated with literature data up to 70 MPa. While differential pressure electrolyzer operation, following ideal isothermal compression, can be more efficient than today{\textquoteright}s best mechanical compressors up to 40 MPa, the intermediate pressure concept shows higher compression efficiency up to 90 MPa.}, issn = {0013-4651, 1945-7111}, doi = {10.1149/2.1361712jes}, url = {http://jes.ecsdl.org/content/164/12/F1187}, author = {Michel Suermann and Thomas Kiupel and Thomas J. Schmidt and Felix N. B{\"u}chi} } @article {783, title = {Electron-energy-loss core-edge structures in manganese oxides}, journal = {Physical Review B}, volume = {48}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {2102-2108}, issn = {0163-1829, 1095-3795}, doi = {10.1103/PhysRevB.48.2102}, url = {https://link.aps.org/doi/10.1103/PhysRevB.48.2102}, author = {Hiroki Kurata and Christian Colliex} } @article {765, title = {Electronic properties of crystalline materials observed in X-ray diffraction}, journal = {Physics Reports}, volume = {411}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {233-289}, issn = {03701573}, doi = {10.1016/j.physrep.2005.01.003}, url = {https://linkinghub.elsevier.com/retrieve/pii/S0370157305000682}, author = {S Lovesey and E Balcar and K Knight and J Fernandezrodriguez} } @article {845, title = {Energy and Climate Impacts of Producing Synthetic Hydrocarbon Fuels from CO 2}, journal = {Environmental Science \& Technology}, 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 = {7111-7121}, issn = {0013-936X, 1520-5851}, doi = {10.1021/es500191g}, url = {http://pubs.acs.org/doi/abs/10.1021/es500191g}, author = {Coen van der Giesen and Ren{\'e} Kleijn and Gert Jan Kramer} } @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 {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 {753, title = {In situ high-temperature powder diffraction studies of solid oxide electrolyte direct carbon fuel cell materials in the presence of brown coal}, journal = {Journal of Materials Science}, volume = {51}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {3928-3940}, abstract = {Direct carbon fuel cells are an attractive alternative for conventional power generation; however, there is almost no information on the stability of conventional fuel cell materials in direct carbon fuel cell environments, in particular when exposed to realistic fuels and the contaminants contained within these fuels. Similarly, there is little information on the structure and phase assemblage of solid fuels exposed to typical environments found in direct carbon fuel cells. In this paper, we use in situ high-resolution synchrotron powder diffraction on conventional high-temperature fuel cell materials and untreated brown coal to assess the stability and reactivity of these materials at various temperatures up to 850 {\textdegree}C. Materials investigated include nickel metal (Ni), gadolinium-doped ceria (GDC) and yttria-stabilised zirconia (YSZ). The phase stability, crystallite size, lattice parameters and associated linear coefficient of thermal expansion were determined. The phase stability of all fuel cell materials was found to be good with no additional phase formation noted either during heating or after prolonged periods at temperature. An increase in the crystallite size was observed for both GDC and Ni. Non-linear thermal expansion observed in these materials was related to partial reduction of cerium ions (GDC) and due to a Curie point transition (Ni). A wide range of mineral phases were observed in the coal samples and these phases were found to change significantly with temperature. Mineral phases consistent with the ash composition and existing literature on Victorian brown coal were assigned to phases observed.}, issn = {1573-4803}, doi = {10.1007/s10853-015-9712-7}, url = {https://doi.org/10.1007/s10853-015-9712-7}, author = {Adam C. Rady and C. Munnings and Sarbjit Giddey and Sukhvinder P. S. Badwal and Sankar Bhattacharya and Aniruddha Kulkarni} } @article {1009, title = {Materials for Proton Exchange Membrane water electrolyzer bipolar plates}, journal = {International Journal of Hydrogen Energy}, volume = {42}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {2713-2723}, abstract = {Titanium based BiPolar Plates (BPPs) are commonly used in Proton Exchange Membrane Water Electrolyzers (PEMWEs) today as they can withstand the harsh operating conditions experienced inside an operating PEM water electrolyzer. In particular, the high anode potential and acidic nature of the PEM is crucial for BPP performance. In this work we expand the investigation of non-coated materials at relevant operating conditions to include molybdenum, 254 SMO, tungsten, AISI 316L, AISI 304L, Inconel 625, niobium and tantalum, in addition to Titanium gr. 2. Pre-designed potentiostatic and potentiodynamic tests at potentials up to 2.0 VSHE were performed in addition to Interfacial Contact Resistance (ICR) and weight loss measurements. Scanning Electron Microscopy (SEM) imaging was conducted to observe morphology changes during the electrochemical tests. Titanium, tantalum and niobium experienced little or no weight change during potentiostatic polarization, while for AISI 304L, AISI 316L and tungsten the measured weight loss was much lower than the weight loss calculated from currents produced. When the potentiostatic test was prolonged for titanium, the ICR was found to increase with time. Auger Electron Spectroscopy measurements confirmed that the increase in ICR for titanium, tantalum and niobium is related to an increased thickness of surface oxides.}, issn = {0360-3199}, doi = {10.1016/j.ijhydene.2016.11.106}, url = {http://www.sciencedirect.com/science/article/pii/S0360319916307613}, author = {Sigrid L{\ae}dre and Ole Edvard Kongstein and Anders Oedegaard and H{\r a}vard Karoliussen and Frode Seland} } @article {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 {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 {890, title = {Reactive ceramics of CeO2{\textendash}MOx (M=Mn, Fe, Ni, Cu) for H2 generation by two-step water splitting using concentrated solar thermal energy}, journal = {Energy}, volume = {32}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {656-663}, issn = {03605442}, doi = {10.1016/j.energy.2006.05.002}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0360544206001186}, author = {H Kaneko and T Miura and H Ishihara and S Taku and T Yokoyama and H Nakajima and Y Tamaura} } @article {760, title = {Resonant 1 s {\textrightarrow} 3 d x-ray Bragg diffraction and structure factors for transition-metal compounds}, journal = {Physical Review B}, volume = {64}, note = {{\textquoteright}doi: 10.1021/acsenergylett.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 = {0163-1829, 1095-3795}, doi = {10.1103/PhysRevB.64.054405}, url = {https://link.aps.org/doi/10.1103/PhysRevB.64.054405}, author = {S. W. Lovesey and K. S. Knight and E. Balcar} } @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 {770, title = {Site- and phase-selective x-ray absorption spectroscopy based on phase-retrieval calculation}, journal = {Journal of Physics: Condensed Matter}, volume = {29}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {113002}, issn = {0953-8984, 1361-648X}, doi = {10.1088/1361-648X/aa53bb}, url = {http://stacks.iop.org/0953-8984/29/i=11/a=113002?key=crossref.5e311d4db6feaedb90887256cf533e5d}, author = {Tomoya Kawaguchi and Katsutoshi Fukuda and Eiichiro Matsubara} } @article {827, title = {Solar water splitting for hydrogen production with monolithic reactors}, journal = {Solar Energy}, volume = {79}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {409-421}, issn = {0038092X}, doi = {10.1016/j.solener.2005.02.026}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0038092X05001465}, author = {C. Agrafiotis and M. Roeb and A.G. Konstandopoulos and L. Nalbandian and V.T. Zaspalis and C. Sattler and P. Stobbe and A.M. Steele} } @article {1033, title = {Solid oxide proton conducting steam electrolysers}, journal = {Solid State Ionics}, volume = {179}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {1120-1124}, abstract = {Proton conducting ceramics based on acceptor doped perovskites are the subject of investigation as candidate electrolyte materials for Solid Oxide Electrolyser Cells (SOECs) that operate at intermediate temperatures. Initial work has focused on BaCe0.9Y0.1O3-δ (BCY10) and BaZr0.9Y0.1O3-δ (BZY10) as these materials have been proven to have high proton conductivities [K.H. Ryu, M. Haile, Solid State Ionics 125 (1999) 355]. Conductivity data from AC impedance spectroscopy measurements for BCY10 is in agreement with the literature. BZY10 doped with 1~wt.\% ZnO was found to have a significantly lower conductivity between 200 and 600~{\textdegree}C than BCY10. BCY10 has been confirmed as a suitable electrolyte material for a reversible proton conducting solid oxide fuel cell. Large losses are observed at lower temperatures in electrolysis mode and are attributed to the slow progression of reactions at the electrodes.}, issn = {0167-2738}, doi = {10.1016/j.ssi.2008.01.067}, url = {http://www.sciencedirect.com/science/article/pii/S0167273808001082}, author = {Paul A. Stuart and Toshiyuki Unno and John A. Kilner and Stephen J. Skinner} } @article {757, title = {Structural Change of the Mn Cluster during the S2{\textrightarrow}S3 State Transition of the Oxygen-Evolving Complex of Photosystem II. Does It Reflect the Onset of Water/Substrate Oxidation? Determination by Mn X-ray Absorption Spectroscopy}, journal = {Journal of the American Chemical Society}, volume = {122}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {3399-3412}, abstract = {The oxygen-evolving complex of Photosystem II in plants and cyanobacteria catalyzes the oxidation of two water molecules to one molecule of dioxygen. A tetranuclear Mn complex is believed to cycle through five intermediate states (S0-S4) to couple the four-electron oxidation of water with the one-electron photochemistry occurring at the Photosystem II reaction center. We have used X-ray absorption spectroscopy to study the local structure of the Mn complex and have proposed a model for it, based on studies of the Mn K-edges and the extended X-ray absorption fine structure of the S1 and S2 states. The proposed model consists of two di-μ-oxo-bridged binuclear Mn units with Mn-Mn distances of \~{}2.7 {\r A} that are linked to each other by a mono-μ-oxo bridge with a Mn-Mn separation of \~{}3.3 {\r A}. The Mn-Mn distances are invariant in the native S1 and S2 states. This report describes the application of X-ray absorption spectroscopy to S3 samples created under physiological conditions with saturating flash illumination. Significant changes are observed in the Mn-Mn distances in the S3 state compared to the S1 and the S2 states. The two 2.7 {\r A} Mn-Mn distances that characterize the di-μ-oxo centers in the S1 and S2 states are lengthened to \~{}2.8 and 3.0 {\r A} in the S3 state, respectively. The 3.3 {\r A} Mn-Mn and Mn-Ca distances also increase by 0.04-0.2 {\r A}. These changes in Mn-Mn distances are interpreted as consequences of the onset of substrate/water oxidation in the S3 state. Mn-centered oxidation is evident during the S0{\textrightarrow}S1 and S1{\textrightarrow}S2 transitions. We propose that the changes in Mn-Mn distances during the S2{\textrightarrow}S3 transition are the result of ligand or water oxidation, leading to the formation of an oxyl radical intermediate formed at a bridging or terminal position. The reaction of the oxyl radical with OH-, H2O, or an oxo group during the subsequent S state conversion is proposed to lead to the formation of the O-O bond. Models that can account for changes in the Mn-Mn distances in the S3 state and the implications for the mechanism of water oxidation are discussed.}, issn = {0002-7863}, doi = {10.1021/ja992501u}, url = {https://doi.org/10.1021/ja992501u}, author = {Wenchuan Liang and Theo A. Roelofs and Roehl M. Cinco and Annette Rompel and Matthew J. Latimer and Wa O. Yu and Kenneth Sauer and Melvin P. Klein and Vittal K. Yachandra} } @article {752, title = {On the structural stability of crystalline ceria phases in undoped and acceptor-doped ceria materials under in situ reduction conditions}, journal = {Crystengcomm}, volume = {21}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {145-154}, abstract = {The reduction of pure and Sm-doped ceria in hydrogen has been studied by synchrotron-based in situ X-ray diffraction to eventually prove or disprove the presence of crystalline cerium hydride (CeHx) phases and the succession of potential structural phase (trans)formations of reduced cerium oxide phases during heating-cooling cycles up to 1273 K. Despite a recent report on the existence of bulk and surface CeHx phases during reductive treatment of pure CeO2 in H-2, structural analysis by Rietveld refinement as well as additional H-1-NMR spectroscopy did not reveal the presence of any crystalline CeHx phase. Rather, a sequence of phase transformations during the re-cooling process in H-2 has been observed. In both samples, the reduced/defective fluorite lattice undergoes at first a transformation into a bixbyite-type lattice with a formal stoichiometry Ce0.583+Ce0.424+O1.71 and Sm0.153+Ce0.393+Ce0.464+O1.73, before a transformation into rhombohedral Ce7O12 takes place in pure CeO2. This phase is clearly absent for the Sm-doped material. Finally, a triclinic Ce11O20 phase appears for both materials, which can be recovered to room temperature, and on which a phase mixture of bixbyite Ce0.663+Ce0.344+O1.67, rh-Ce0.603+Ce0.404+O1.70 and tri-Ce0.483+Ce0.524+O1.76 (for pure CeO2) or bixbyite Sm0.153+Ce0.473+Ce0.384+O1.69 and tri-Sm0.153+Ce0.313+Ce0.544+O1.77 (for Sm-doped CeO2) prevails. The absence of the rhombohedral phase indicates that Sm doping leads to the stabilization of the bixbyite phase over the rhombohedral one at this particular oxygen vacancy concentration. It is worth noting that recent work proves that hydrogen is indeed incorporated within the structures during the heat treatments, but under the chosen experimental conditions it has apparently no effect on the salient structural principles during reduction.}, issn = {1466-8033}, doi = {10.1039/c8ce01726c}, author = {Maged F. Bekheet and Matthias Gruenbacher and Lukas Schlicker and Albert Gili and Andrew Doran and Jan Dirk Epping and Aleksander Gurlo and Bernhard Kloetzer and Simon Penner} } @article {885, title = {Sunshine to Petrol: A Metal Oxide-Based Thermochemical Route to Solar Fuels}, number = {SAND2009-4579A}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, author = {Albuquerque Sandia National Laboratories and James E. Miller and Richard B. Diver Jr. and Nathan Phillip Siegel and Eric Coker and Andrea Ambrosini and Daniel E. Dedrick and Mark D. Allendorf and Anthony H. McDaniel and Gary L Kellogg and Roy E. Hogan Jr. and Ken S. Chen and Ellen B. Stechel} } @article {896, title = {Test operation of a 100kW pilot plant for solar hydrogen production from water on a solar tower}, journal = {Solar Energy}, volume = {85}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {634-644}, issn = {0038092X}, doi = {10.1016/j.solener.2010.04.014}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0038092X10001623}, author = {M. Roeb and J.-P. S{\"a}ck and P. Rietbrock and C. Prahl and H. Schreiber and M. Neises and L. de Oliveira and D. Graf and M. Ebert and W. Reinalter and M. Meyer-Gr{\"u}nefeldt and C. Sattler and A. Lopez and A. Vidal and A. Elsberg and P. Stobbe and D. Jones and A. Steele and S. Lorentzou and C. Pagkoura and A. Zygogianni and C. Agrafiotis and A.G. Konstandopoulos} } @article {879, title = {Thermochemical Cycles for High-Temperature Solar Hydrogen Production}, journal = {Chemical Reviews}, volume = {107}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {4048-4077}, issn = {0009-2665, 1520-6890}, doi = {10.1021/cr050188a}, url = {http://pubs.acs.org/doi/abs/10.1021/cr050188a}, author = {Tatsuya Kodama and Nobuyuki Gokon} } @article {875, title = {Thermochemical hydrogen production by a redox system of ZrO2-supported Co(II)-ferrite}, journal = {Solar Energy}, volume = {78}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {623-631}, issn = {0038092X}, doi = {10.1016/j.solener.2004.04.008}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0038092X04000830}, author = {T. Kodama and Y. Kondoh and R. Yamamoto and H. Andou and N. Satou} } @article {952, title = {Thermochemical reactivity of 5{\textendash}15mol\% Fe, Co, Ni, Mn-doped cerium oxides in two-step water-splitting cycle for solar hydrogen production}, journal = {Thermochimica Acta}, volume = {617}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {179-190}, issn = {00406031}, doi = {10.1016/j.tca.2015.08.036}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0040603115003561}, author = {Nobuyuki Gokon and Toshinori Suda and Tatsuya Kodama} } @article {904, title = {Thermochemical two-step water splitting by internally circulating fluidized bed of NiFe2O4 particles: Successive reaction of thermal-reduction and water-decomposition steps}, 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 = {4757-4767}, issn = {03603199}, doi = {10.1016/j.ijhydene.2011.01.076}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0360319911001194}, author = {Nobuyuki Gokon and Tetsuro Mataga and Nobuyuki Kondo and Tatsuya Kodama} } @article {881, title = {Thermochemical Two-Step Water Splitting by ZrO2-supported NixFe3-xO4 for Solar Hydrogen Production}, journal = {Solar Energy}, volume = {82}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {73-79}, issn = {0038092X}, doi = {10.1016/j.solener.2007.03.005}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0038092X07000783}, author = {T. Kodama and N. Gokon and R. Yamamoto} } @article {802, title = {Thermodynamic modeling of the hybrid sulfur (HyS) cycle for hydrogen production}, journal = {Fluid Phase Equilibria}, volume = {460}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {175-188}, abstract = {We have developed a comprehensive thermodynamic model for the ternary system sulfur dioxide~+~sulfuric acid~+~water based on a previously published thermodynamic model of the aqueous sulfuric acid system using the symmetric electrolyte NRTL (eNRTL) activity coefficient model. The eNRTL binary interaction parameters and the chemical equilibrium constants are regressed from experimental SO2 solubility data in aqueous sulfuric acid solutions. The model accurately represents all thermodynamic properties including vapor-liquid equilibrium, liquid-liquid equilibrium, calorimetric properties, and speciation over a wide acid concentration range, from pure water to pure sulfuric acid and pure sulfur dioxide, and temperatures from 273.15 to 393.15 K. The model should be very useful in supporting process research, development, and design of advanced water-splitting processes based on the hybrid sulfur (HyS) cycle.}, issn = {0378-3812}, doi = {10.1016/j.fluid.2017.12.025}, url = {http://www.sciencedirect.com/science/article/pii/S0378381217305095}, author = {Harnoor Kaur and Meng Wang and Maximilian B. Gorensek and Chau-Chyun Chen} } @article {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 {778, title = {Understanding crystallization pathways leading to manganese oxide polymorph formation}, journal = {Nature Communications}, volume = {9}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {2553}, abstract = {Minor variations in synthesis conditions can redirect crystallization pathways through different nonequilibrium intermediates. Here, the authors present a theoretical framework to predict which polymorphs appear during MnO2 precipitation, which is validated by in situ X-ray scattering of reaction progression.}, issn = {2041-1723}, doi = {10.1038/s41467-018-04917-y}, url = {https://www.nature.com/articles/s41467-018-04917-y}, author = {Bor-Rong Chen and Wenhao Sun and Daniil A. Kitchaev and John S. Mangum and Vivek Thampy and Lauren M. Garten and David S. Ginley and Brian P. Gorman and Kevin H. Stone and Gerbrand Ceder and Michael F. Toney and Laura T. Schelhas} } @article {787, title = {Understanding the spectroscopic signatures of Mn valence changes in the valence energy loss spectra of Li-Mn-Ni-O spinel oxides}, journal = {Physical Review Materials}, volume = {1}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, issn = {2475-9953}, doi = {10.1103/PhysRevMaterials.1.074402}, url = {https://link.aps.org/doi/10.1103/PhysRevMaterials.1.074402}, author = {M. K. Kinyanjui and P. Axmann and M. Mancini and G. Gabrielli and P. Balasubramanian and F. Boucher and M. Wohlfahrt-Mehrens and U. Kaiser} } @article {774, title = {Valence measurement of Mn oxides using Mn K-beta emission spectroscopy}, journal = {JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS}, volume = {61}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {547-460}, abstract = {High resolution Mn K-beta emission spectra provide a direct method to probe the effective spin state and charge density on Mn sites. Direct comparison of MnF2 and MnO reveals significant changes due to the degree of covalency. The detailed shape and energy shi of thr spectra for the perovskite LaMnO3 and CaMnO3 compounds are found to be very similar to Mn2O3 and MnO2, respectively. Detailed Mn K-beta X-ray emission results on La1-xCaxMnO3 can be well fit by linear superpositions of the end member spectra. However, for x < 0.3, a retarded response is found. No evidence for Mn2+ is found}, author = {Q Qian and TA Tyson and CC Kao and JP Rueff and FMF deGroot and M Croft and SW Cheong and M Breenblatt and MA Subramanian} }