@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 {1144, title = {Migration of inclusions in a matrix due to a spatially varying interface energy}, journal = {Scripta Materialia}, volume = {206}, year = {2022}, pages = {114235}, abstract = {An interfacial energy can be a function of a bulk field such as temperature or electric field. We find that in a system with a gradient in temperature or electric potential, the resulting variation in interfacial energy can induce a particle to migrate by either surface or bulk diffusion. For a circular particle under a constant unidirectional gradient in the bulk field, the field dependence of the interfacial energy induces a circular particle to move as a circle at a constant velocity along the direction from higher to lower interfacial energy. A linear stability analysis of this steady state migration suggests that perturbations will damp out as time evolves, and thus under these conditions a migrating circular particle is morphologically stable. Other spatial distributions of interface energy can lead to the distortion of an initially circular shaped particle during migration. A phase field model is developed that captures these distortions and verifies the theoretical results mentioned above.}, keywords = {Bulk diffusion, Interface diffusion, Interface energy depends on a field varying with location, Particle migration}, issn = {1359-6462}, doi = {https://doi.org/10.1016/j.scriptamat.2021.114235}, url = {https://www.sciencedirect.com/science/article/pii/S1359646221005157}, author = {Qian Zhang and Scott Barnett and Peter Voorhees} } @article {1111, title = {Development of a Photoelectrochemically Self-Improving Si/GaN Photocathode for Efficient and Durable H2 Production}, journal = {Nature Materials}, year = {2021}, month = {04/2021}, pages = {1-6}, doi = {10.1038/s41563-021-00965-w}, url = {https://doi.org/10.1038/s41563-021-00965-w}, author = {Guosong Zeng and Tuan Anh Pham and Srinivas Vanka and Guiji Liu and Chengyu Song and Jason K. Cooper and Zetian Mi and Tadashi Ogitsu and Francesca M. Toma} } @article {1156, title = {Energy Material Network Data Hubs}, journal = {International Journal of Advanced Computer Science and Applications}, volume = {12}, year = {2021}, abstract = {In early 2015 the United States Department of Energy conceived of a consortium of collaborative bodies based on shared expertise, data, and resources that could be targeted towards the more difficult problems in energy materials research. The concept of virtual laboratories had been envisioned and discussed earlier in the decade in response to the advent of the Materials Genome Initiative and similar scientific thrusts. To be effective, any virtual laboratory needed a robust method for data management, communication, security, data sharing, dissemination, and demonstration to work efficiently and effectively for groups of remote researchers. With the accessibility of new, easily deployed cloud technology and software frameworks, such individual elements could be integrated, and the required collaboration architecture is now possible. The developers have leveraged open-source software frameworks, customized them, and merged them into a platform to enable collaborative energy materials science, regardless of the geographic dispersal of the people and resources. After five years in operations, the systems are demonstratively an effective platform for enabling research within the Energy Material Networks (EMN). This paper will show the design and development of a secured scientific data sharing platform, the ability to customize the system to support diverse workflows, and examples of the enabled research and results connected with some of the Energy Material Networks.}, keywords = {cloud computing, consortium, data management, Energy materials research, network, virtual laboratories}, doi = {10.14569/IJACSA.2021.0120677}, url = {http://dx.doi.org/10.14569/IJACSA.2021.0120677}, author = {Robert R. White and Kristin Munch and Nicholas Wunder and Nalinrat Guba and Chitra Sivaraman and Kurt M. Van Allsburg and Huyen Dinh and Courtney Pailing} } @article {1152, title = {A mini-review on proton conduction of BaZrO 3 -based perovskite electrolytes}, journal = {Journal of Physics: Energy}, volume = {3}, year = {2021}, month = {07}, pages = {032019}, keywords = {ceramics, dopant, electrolyte, electrolytic cell, energy conversion, fuel cell, hydration, interaction, mobility, oxide, proton, proton conduction}, doi = {10.1088/2515-7655/ac12ab}, author = {Vera, Clarita and Ding, Hanping and Peterson, David and Gibbons, William and Zhou, Meng and Ding, Dong} } @article {1166, title = {The oxygen partial pressure in solid oxide electrolysis cells with multilayer electrolytes}, journal = {Acta Materialia}, volume = {213}, year = {2021}, pages = {116928}, abstract = {A number of degradation mechanisms have been observed during the long-term operation of solid oxide electrolysis cells (SOEC). Using an electrolyte charge carrier transport model and a diffuse interface treatment for a multilayer electrolytes, we quantify the oxygen potentials across the electrolyte and thereby provide insights into these degradation mechanisms. Our model describes the transport of charge carriers in the electrolyte when the oxygen partial pressure is extremely low by accounting for the spatial variation of the concentration of oxygen vacancies in the electrolyte which is closely related to the degradation of the SOEC near the interface of hydrogen electrode and electrolyte. Moreover, we identify four quantities that characterize the distribution of oxygen partial pressure in the electrolyte, which are directly related to the degradation mechanisms in the electrolyte as well, and give analytical estimates for them. These analytical expressions provide guidance on the parameters that need to be controlled to suppress the degradation observed in the electrolyte.}, keywords = {Diffuse interface model, Multilayer electrolyte, Oxygen partial pressure, solid oxide electrolysis cell}, issn = {1359-6454}, doi = {https://doi.org/10.1016/j.actamat.2021.116928}, url = {https://www.sciencedirect.com/science/article/pii/S1359645421003086}, author = {Qian Zhang and Qin-Yuan Liu and Beom-Kyeong Park and Scott Barnett and Peter Voorhees} } @article {1116, title = {Performance and Limits of 2.0 eV Bandgap CuInGaS2 Solar Absorber Integrated With CdS Buffer on F:SnO2 Substrate for Multijunction Photovoltaic and Photoelectrochemical Water Splitting Devices}, volume = {2}, year = {2021}, pages = {5752-5763}, doi = {https://doi.org/10.1039/D1MA00570G}, author = {N. Gaillard and W. Septina and J. Varley and T. Ogitsu and K. K. Ohtaki and H. A. Ishii and J. P. Bradley and C. Muzzillo and K. Zhu and F. Babbe and J. Cooper} } @article {1175, title = {On the role of the zirconia/ceria interface in the degradation of solid oxide electrolysis cells}, journal = {Applied Physics Letters}, volume = {117}, year = {2020}, pages = {123906}, keywords = {INL; o-SOEC}, doi = {10.1063/5.0016478}, url = {https://doi.org/10.1063/5.0016478}, author = {Zhang,Qian and Park,Beom-Kyeong and Barnett,Scott and Voorhees,Peter} } @article {1179, title = {Understanding of A-site deficiency in layered perovskites: promotion of dual reaction kinetics for water oxidation and oxygen reduction in protonic ceramic electrochemical cells}, journal = {J. Mater. Chem. A}, volume = {8}, year = {2020}, pages = {14600-14608}, abstract = {Protonic ceramic electrochemical cells (PCECs) are promising solid-state energy conversion devices which enable the conversion of energy between electricity and hydrogen at intermediate temperatures. Rapid conversion between chemical and electrical energy via PCEC technology will assist in overcoming grand challenges in energy storage. To achieve highly efficient reversible operation between hydrogen production and electricity generation, boosting water-oxidation and oxygen reduction activities of the oxygen electrode while maintaining the durable operation is one of the early-stage technical opportunities. In this study, an A-site deficient layered perovskite (PrBa0.8Ca0.2)0.95Co2O6-δ has been developed as an oxygen electrode for a PCEC which presents superior electrochemical performances. The electrolysis current density reached as high as -0.72 A cm-2 at 1.3 V, and a peak power density of 0.540 W cm-2 was obtained at 600 {\textdegree}C in electrolysis and fuel cell mode, respectively. The PCEC with the new electrode shows good durability under practical operating conditions for 160 hours in both operating modes with no observable degradation. The reversibility between the electrolysis and fuel cell mode is also successfully demonstrated.}, keywords = {Durability; HTE; Layered perovskite; Protonic ceramic electrochemical cells}, doi = {10.1039/D0TA05137C}, url = {http://dx.doi.org/10.1039/D0TA05137C}, author = {Tang, Wei and Ding, Hanping and Bian, Wenjuan and Wu, Wei and Li, Wenyuan and Liu, Xingbo and Gomez, Joshua Y. and Regalado Vera, Clarita Y. and Zhou, Meng and Ding, Dong} } @article {1182, title = {Conditions for stable operation of solid oxide electrolysis cells: oxygen electrode effects}, journal = {Energy Environ. Sci.}, volume = {12}, year = {2019}, pages = {3053-3062}, abstract = {Solid oxide electrolysis cells (SOECs) convert renewable electricity to fuels with efficiency substantially higher than other electrolysis technologies. However, questions remain regarding degradation mechanisms that limit SOEC long-term stability. One of the key degradation mechanisms is oxygen electrode delamination; although prior studies have improved the understanding of this mechanism, it is still difficult to predict how degradation depends on SOEC materials and operating conditions, i.e., temperature, voltage, and current density. Here we present a study aimed at developing a quantitative understanding of oxygen electrode delamination. Experimentally, a life test study of symmetric and full cells with yttria-stabilized zirconia (YSZ) electrolytes and Gd-doped ceria (GDC) barrier layers was done with three different perovskite oxygen electrode materials. Fracture was observed at the perovskite{\textendash}GDC interface above a critical current density and below a critical operating temperature. A theory is presented that combines a calculation of the effective oxygen pressure across the electrolyte with an estimation of the pressure required for fracture. Fracture is correctly predicted for a critical oxygen partial pressure of \~{}7200 atm and an associated electrode overpotential of \~{}0.2 V, occurring at the electrode/GDC interface because of the relatively low perovskite fracture toughness. Damage at the GDC/YSZ interface was also observed in some cases and explained by a peak in the oxygen pressure at this interface.}, keywords = {Gd-doped ceria, HTE, Perovskite, SOEC, Yttria-stabilized zirconia}, doi = {10.1039/C9EE01664C}, url = {http://dx.doi.org/10.1039/C9EE01664C}, author = {Park, Beom-Kyeong and Zhang, Qian and Voorhees, Peter W. and Barnett, Scott A.} } @article {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 {1184, title = {Effect of direct-current operation on the electrochemical performance and structural evolution of Ni-YSZ electrodes}, journal = {Journal of Physics: Energy}, volume = {2}, year = {2019}, month = {12/2019}, pages = {014006}, abstract = {The effect of electrolysis operations on Ni-YSZ fuel electrode stability was studied at different current densities and fuel mixtures during 1000 h life tests. For a typical electrolysis mixture of 50\% H2/50\% H2O and 0.6 A cm-2 current density, cell ohmic resistance values were reasonably stable and no structural changes occurred. However, for more reducing conditions (97\% H2/3\% H2O), increasing the current density above 0.4 A cm-2 increased the ohmic resistance accompanied by significant electrolyte degradation including fracture and void formation at grain boundaries. Numerical analysis was carried out to determine the effective oxygen partial pressure across the electrolyte. The results show that the oxygen partial pressure values at high current density and low steam content may be low enough to reduce zirconia to form a Ni-Zr alloy product, initiating the observed electrolyte structural degradation.}, keywords = {durability, HTE, SOEC, Yttria-stabilized zirconia}, doi = {10.1088/2515-7655/ab59a6}, url = {https://doi.org/10.1088/2515-7655/ab59a6}, author = {Qinyuan Liu and Qian Zhang and Peter W Voorhees and Scott A Barnett} } @article {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 {1188, title = {Long-term stability studies of a semiconductor photoelectrode in three-electrode configuration}, journal = {Journal of Materials Chemistry A}, volume = {7}, year = {2019}, pages = {27612-27619}, abstract = {Improving the stability of semiconductor materials is one of the major challenges for sustainable and economic photoelectrochemical water splitting. N-terminated GaN nanostructures have emerged as a practical protective layer for conventional high efficiency but unstable Si and III{\textendash}V photoelectrodes due to their near-perfect conduction band-alignment, which enables efficient extraction of photo-generated electrons, and N-terminated surfaces, which protects against chemical and photo-corrosion. Here, we demonstrate that Pt-decorated GaN nanostructures on an n+{\textendash}p Si photocathode can exhibit an ultrahigh stability of 3000 h (i.e., over 500 days for usable sunlight \~{}5.5 h per day) at a large photocurrent density (>35 mA cm-2) in three-electrode configuration under AM 1.5G one-sun illumination. The measured applied bias photon-to-current efficiency of 11.9\%, with an excellent onset potential of \~{}0.56 V vs. RHE, is one of the highest values reported for a Si photocathode under AM 1.5G one-sun illumination. This study provides a paradigm shift for the design and development of semiconductor photoelectrodes for PEC water splitting: stability is no longer limited by the light absorber, but rather by co-catalyst particles.}, keywords = {durability, GaN nanowires, PEC, Photocathode, Pt hydrogen evolution catalyst, Silicon}, doi = {10.1039/C9TA09926C}, url = {http://dx.doi.org/10.1039/C9TA09926C}, author = {Vanka, Srinivas and Sun, Kai and Zeng, Guosong and Pham, Tuan Anh and Toma, Francesca Maria and Ogitsu, Tadashi and Mi, Zetian} } @article {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 {1085, title = {Gallium nitride nanowire as a linker of molybdenum sulfides and silicon for photoelectrocatalytic water splitting}, journal = {Nature Communications}, volume = {9}, year = {2018}, month = {09/2018}, pages = {3856}, abstract = {Published on September 21st, 2018. Sunlight-harvesting materials require the clean integration of light-absorbing and catalytic components to be efficient. Here, authors link silicon photoelectrodes and molybdenum sulfide catalysts with defect-free gallium nitride nanowire to improve photoelectrochemical hydrogen evolution.
}, issn = {2041-1723}, doi = {10.1038/s41467-018-06140-1}, url = {https://www.nature.com/articles/s41467-018-06140-1}, author = {Baowen Zhou and Xianghua Kong and Srinivas Vanka and Sheng Chu and Pegah Ghamari and Yichen Wang and Nick Pant and Ishiang Shih and Hong Guo and Zetian Mi} } @article {1086, title = {High Efficiency Si Photocathode Protected by Multifunctional GaN Nanostructures}, journal = {Nano Letters}, volume = {18}, year = {2018}, pages = {6530-6537}, abstract = {Published on October 10th, 2018. Photoelectrochemical water splitting is a clean and environmentally friendly method for solar hydrogen generation. Its practical application, however, has been limited by the poor stability of semiconductor photoelectrodes. In this work, we demonstrate the use of GaN nanostructures as a multifunctional protection layer for an otherwise unstable, low-performance photocathode. The direct integration of GaN nanostructures on n+{\textendash}p Si wafer not only protects Si surface from corrosion but also significantly reduces the charge carrier transfer resistance at the semiconductor/liquid junction, leading to long-term stability (\>100 h) at a large current density (\>35 mA/cm2) under 1 sun illumination. The measured applied bias photon-to-current efficiency of 10.5\% is among the highest values ever reported for a Si photocathode. Given that both Si and GaN are already widely produced in industry, our studies offer a viable path for achieving high-efficiency and highly stable semiconductor photoelectrodes for solar water splitting with proven manufacturability and scalability.
}, issn = {1530-6984}, doi = {10.1021/acs.nanolett.8b03087}, url = {https://doi.org/10.1021/acs.nanolett.8b03087}, author = {Srinivas Vanka and Elisabetta Arca and Shaobo Cheng and Kai Sun and Gianluigi A. Botton and Glenn Teeter and Zetian Mi} } @article {1097, title = {(Invited) HydroGEN: An AWSM Energy Materials Network}, journal = {ECS Transactions}, volume = {85}, year = {2018}, month = {05/2018}, pages = {3-14}, abstract = {The HydroGEN (https://www.h2awsm.org/) energy materials network (EMN) aims to accelerate the research and development (R\&D) of advanced water splitting (AWS) technologies for clean, sustainable hydrogen production. Announced in October 2016, the HydroGEN EMN comprises six core National Laboratories and focuses on four AWS pathways: low- and high-temperature electrolysis, photoelectrochemical, and solar thermochemical water splitting. The HydroGEN consortium offers an extensive collection of materials research capabilities for addressing R\&D challenges in discovery and design, efficacy and efficiency, durability and cost. Leveraging the HydroGEN Consortium{\textquoteright}s technical experts and broad collection of unique resource capabilities is expected to advance the maturity and technology readiness levels in each advanced water splitting technology pathway.
}, issn = {1938-6737, 1938-5862}, doi = {10.1149/08511.0003ecst}, url = {http://ecst.ecsdl.org/content/85/11/3}, author = {James W. Vickers and Huyen N. Dinh and Katie Randolph and Adam Z. Weber and Anthony H. McDaniel and Richard Boardman and Tadashi Ogitsu and Hector Colon-Mercado and David Peterson and Eric L. Miller} } @article {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 {871, title = {Applications and limitations of two step metal oxide thermochemical redox cycles; a review}, journal = {J. Mater. Chem. 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 = {18951-18966}, issn = {2050-7488, 2050-7496}, doi = {10.1039/C7TA05025A}, url = {http://xlink.rsc.org/?DOI=C7TA05025A}, author = {B. Bulfin and J. Vieten and C. Agrafiotis and M. Roeb and C. Sattler} } @article {766, title = {In situ X-ray absorption spectroscopy of transition metal based water oxidation catalysts}, journal = {Chemical Society Reviews}, volume = {46}, year = {2017}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {102-125}, issn = {0306-0012, 1460-4744}, doi = {10.1039/C6CS00230G}, url = {http://xlink.rsc.org/?DOI=C6CS00230G}, author = {Christina H. M. van Oversteeg and Hoang Q. Doan and Frank M. F. de Groot and Tanja Cuk} } @article {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} } @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 {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 {844, title = {Ceria-based electrospun fibers for renewable fuel production via two-step thermal redox cycles for carbon dioxide splitting}, journal = {Physical Chemistry Chemical Physics}, volume = {16}, 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 = {14271}, issn = {1463-9076, 1463-9084}, doi = {10.1039/c4cp01974a}, url = {http://xlink.rsc.org/?DOI=c4cp01974a}, author = {William T. Gibbons and Luke J. Venstrom and Robert M. De Smith and Jane H. Davidson and Gregory S. Jackson} } @article {999, title = {Addressing the terawatt challenge: scalability in the supply of chemical elements for renewable energy}, journal = {RSC Advances}, volume = {2}, 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 = {7933-7947}, doi = {10.1039/C2RA20839C}, url = {http://pubs.rsc.org/en/Content/ArticleLanding/2012/RA/C2RA20839C}, author = {Peter C. K.~Vesborg and Thomas F.~Jaramillo} } @article {808, title = {CO2 valorisation based on Fe3O4/FeO thermochemical redox reactions using concentrated solar energy}, journal = {International Journal of Energy Research}, 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 = {n/a-n/a}, abstract = {Published in February 2012.}, issn = {0363907X}, doi = {10.1002/er.1953}, url = {http://doi.wiley.com/10.1002/er.1953}, author = {St{\'e}phane Abanades and Isabel Villafan-Vidales} } @article {921, title = {The Effects of Morphology on the Oxidation of Ceria by Water and Carbon Dioxide}, journal = {Journal of Solar Energy Engineering}, volume = {134}, 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 = {011005}, issn = {01996231}, doi = {10.1115/1.4005119}, url = {http://SolarEnergyEngineering.asmedigitalcollection.asme.org/article.aspx?articleid=1456274}, author = {Luke J. Venstrom and Nicholas Petkovich and Stephen Rudisill and Andreas Stein and Jane H. Davidson} } @article {804, title = {Control of Heterogeneity in Nanostructured Ce1{\textendash}xZrxO2 Binary Oxides for Enhanced Thermal Stability and Water Splitting Activity}, journal = {The Journal of Physical Chemistry C}, volume = {115}, year = {2011}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {21022-21033}, abstract = {Published on November 3rd, 2011.}, issn = {1932-7447, 1932-7455}, doi = {10.1021/jp2071315}, url = {http://pubs.acs.org/doi/abs/10.1021/jp2071315}, author = {Nicholas D. Petkovich and Stephen G. Rudisill and Luke J. Venstrom and Daniel B. Boman and Jane H. Davidson and Andreas Stein} } @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 {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 {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 {943, title = {Hydrogen production by water splitting on manganese ferrite-sodium carbonate mixture: Feasibility tests in a packed bed solar reactor-receiver}, journal = {International Journal of Hydrogen Energy}, volume = {39}, 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 = {20920-20929}, issn = {03603199}, doi = {10.1016/j.ijhydene.2014.10.105}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0360319914029450}, author = {Francesca Varsano and Maria Anna Murmura and Bruno Brunetti and Franco Padella and Aurelio La Barbera and Carlo Alvani and Maria Cristina Annesini} } @article {958, title = {Low-temperature reducibility of MxCe1{\textendash}xO2(M = Zr, Hf) under hydrogen atmosphere}, journal = {The Journal of Physical Chemistry C}, volume = {120}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {118-125}, issn = {1932-7447, 1932-7455}, doi = {10.1021/acs.jpcc.5b10796}, url = {http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.5b10796}, author = {Alexander Bonk and Arndt Remhof and Annika C. Maier and Matthias Trottmann and Meike V. F. Schlupp and Corsin Battaglia and Ulrich F. Vogt} } @article {931, title = {Material Analysis of Coated Siliconized Silicon Carbide (SiSiC) Honeycomb Structures for Thermochemical Hydrogen Production}, journal = {Materials}, 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 = {421-436}, issn = {1996-1944}, doi = {10.3390/ma6020421}, url = {http://www.mdpi.com/1996-1944/6/2/421/}, author = {Martina Neises-von Puttkamer and Heike Simon and Martin Schm{\"u}cker and Martin Roeb and Christian Sattler and Robert Pitz-Paal} } @article {1007, title = {Methods of photoelectrode characterization with high spatial and temporal resolution}, journal = {Energy \& Environmental Science}, volume = {8}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {2863-2885}, abstract = {Materials and photoelectrode architectures that are highly efficient, extremely stable, and made from low cost materials are required for commercially viable photoelectrochemical (PEC) water-splitting technology. A key challenge is the heterogeneous nature of real-world materials, which often possess spatial variation in their crystal structure, morphology, and/or composition at the nano-, micro-, or macro-scale. Different structures and compositions can have vastly different properties and can therefore strongly influence the overall performance of the photoelectrode through complex structure{\textendash}property relationships. A complete understanding of photoelectrode materials would also involve elucidation of processes such as carrier collection and electrochemical charge transfer that occur at very fast time scales. We present herein an overview of a broad suite of experimental and computational tools that can be used to define the structure{\textendash}property relationships of photoelectrode materials at small dimensions and on fast time scales. A major focus is on in situ scanning-probe measurement (SPM) techniques that possess the ability to measure differences in optical, electronic, catalytic, and physical properties with nano- or micro-scale spatial resolution. In situ ultrafast spectroscopic techniques, used to probe carrier dynamics involved with processes such as carrier generation, recombination, and interfacial charge transport, are also discussed. Complementing all of these experimental techniques are computational atomistic modeling tools, which can be invaluable for interpreting experimental results, aiding in materials discovery, and interrogating PEC processes at length and time scales not currently accessible by experiment. In addition to reviewing the basic capabilities of these experimental and computational techniques, we highlight key opportunities and limitations of applying these tools for the development of PEC materials.}, issn = {1754-5706}, doi = {10.1039/C5EE00835B}, url = {http://pubs.rsc.org/en/content/articlelanding/2015/ee/c5ee00835b}, author = {Daniel V. Esposito and Jason B. Baxter and Jimmy John and Nathan S. Lewis and Thomas P. Moffat and Tadashi Ogitsu and Glen D. O{\textquoteright}Neil and Tuan Anh Pham and A. Alec Talin and Jesus M. Velazquez and Brandon C. Wood} } @article {967, title = {Oxidation and reduction reaction kinetics of mixed cerium zirconium oxides}, journal = {The Journal of Physical Chemistry C}, volume = {120}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {2027-2035}, issn = {1932-7447, 1932-7455}, doi = {10.1021/acs.jpcc.5b08729}, url = {http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.5b08729}, author = {B. Bulfin and F. Call and J. Vieten and M. Roeb and C. Sattler and I. V. Shvets} } @article {784, title = {Oxidation state and chemical shift investigation in transition metal oxides by EELS}, journal = {Ultramicroscopy}, volume = {116}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {24-33}, issn = {03043991}, doi = {10.1016/j.ultramic.2012.03.002}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0304399112000381}, author = {Haiyan Tan and Jo Verbeeck and Artem Abakumov and Gustaaf Van Tendeloo} } @article {987, title = {Redox thermodynamics and phase composition in the system SrFeO 3-δ {\textemdash} SrMnO 3-δ}, journal = {Solid State Ionics}, volume = {308}, 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 = {149-155}, issn = {01672738}, doi = {10.1016/j.ssi.2017.06.014}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0167273817302990}, author = {J. Vieten and B. Bulfin and M. Senholdt and M. Roeb and C. Sattler and M. Schm{\"u}cker} } @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 {909, title = {Solar Thermochemical CO2 Splitting Utilizing a Reticulated Porous Ceria Redox System}, journal = {Energy \& Fuels}, 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 = {7051-7059}, issn = {0887-0624}, doi = {10.1021/ef3013757}, url = {http://dx.doi.org/10.1021/ef3013757}, author = {Philipp Furler and Jonathan Scheffe and Michal Gorbar and Louis Moes and Ulrich Vogt and Aldo Steinfeld} } @article {763, title = {Spectroscopy of La0.5Sr1.5MnO4 orbital ordering: a cluster many-body calculation}, journal = {The European Physical Journal B}, volume = {53}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {23-28}, issn = {1434-6028, 1434-6036}, doi = {10.1140/epjb/e2006-00340-5}, url = {http://www.springerlink.com/index/10.1140/epjb/e2006-00340-5}, author = {A. Mirone and S. S. Dhesi and G. van der Laan} } @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 {750, title = {Structural properties of Sm-doped ceria electrolytes at the fuel cell operating temperatures}, journal = {Solid State Ionics}, volume = {315}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {85-91}, abstract = {A high temperature structural study (673{\textendash}1073K) was performed by means of synchrotron x-ray diffraction and μ-Raman spectroscopy on several compositions belonging to the Ce1-xSmxO2-x/2 system with the aim to investigate the crystallographic features of Sm-doped ceria electrolytes at the fuel cell operating temperatures; ionic conductivity of samples with x ranging between 0.1 and 0.4 was measured too in order to correlate the main structural features with transport properties. A slight shift toward lower x values of the fluorite-based/hybrid region boundary is observed with increasing temperature; moreover, the coefficient of thermal expansion reveals a strong slope change close to x=0.3, which represents the crossover composition between the two atomic arrangements. The presence of C-structured RE2O3 nanodomains within the fluorite structure starting from x~0.2 is revealed by μ-Raman spectroscopy and confirmed by the behaviour of total conductivity. The ordering effect exerted at each temperature by the Sm-vacancies aggregates on the fluorite structure within the hybrid region influences the behaviour of both the intensity and the full width at half maximum of the Raman signal typical of the CeO2 structure. The obtained results are discussed in comparison to the ones deriving from the Gd-doped ceria system.}, issn = {0167-2738}, doi = {10.1016/j.ssi.2017.12.009}, url = {http://www.sciencedirect.com/science/article/pii/S0167273817304800}, author = {C. Artini and M. M. Carnasciali and M. Viviani and S. Presto and J. R. Plaisier and G. A. Costa and M. Pani} } @article {780, title = {Surface Defect Chemistry and Electronic Structure of Pr 0.1 Ce 0.9 O 2-δ Revealed in Operando}, journal = {Chemistry of Materials}, volume = {30}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {2600-2606}, issn = {0897-4756, 1520-5002}, doi = {10.1021/acs.chemmater.7b05129}, url = {http://pubs.acs.org/doi/10.1021/acs.chemmater.7b05129}, author = {Qiyang Lu and Gulin Vardar and Maximilian Jansen and Sean R. Bishop and Iradwikanari Waluyo and Harry L. Tuller and Bilge Yildiz} } @article {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 {923, title = {Thermodynamic analysis of isothermal redox cycling of ceria for solar fuel production}, journal = {Energy \& Fuels}, note = {{\textquoteright}doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen{\textquoteright} {\textquoteright}\n - jyoungstrom{\textquoteright} {\textquoteright}Jason thinks this is great.\n~\n - jyoungstrom{\textquoteright} {\textquoteright}\n - estechel{\textquoteright} }, pages = {130812072357003}, issn = {0887-0624, 1520-5029}, doi = {10.1021/ef400132d}, url = {http://pubs.acs.org/doi/abs/10.1021/ef400132d}, author = {Roman Bader and Luke J. Venstrom and Jane H. Davidson and Wojciech Lipi{\'n}ski} } @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 {973, title = {Vacuum pumping options for application in solar thermochemical redox cycles {\textendash} Assessment of mechanical-, jet- and thermochemical pumping systems}, journal = {Solar Energy}, volume = {141}, 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 = {91-102}, issn = {0038092X}, doi = {10.1016/j.solener.2016.11.023}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0038092X16305552}, author = {Stefan Brendelberger and Henrik von Storch and Brendan Bulfin and Christian Sattler} }