The Experts below are selected from a list of 25343691 Experts worldwide ranked by ideXlab platform
Stephen J Skinner - One of the best experts on this subject based on the ideXlab platform.
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high oxide ion conductivity through the interstitial oxygen site in ba7nb4moo20 based hexagonal perovskite related oxides
Nature Communications, 2021Co-Authors: Masatomo Yashima, Takafumi Tsujiguchi, Yuichi Sakuda, Yuta Yasui, Yu Zhou, Kotaro Fujii, Shuki Torii, Takashi Kamiyama, Stephen J SkinnerAbstract:Oxide-ion conductors are important in various applications such as solid-oxide fuel cells. Although zirconia-based materials are widely utilized, there remains a strong motivation to discover electrolyte materials with higher conductivity that lowers the working temperature of fuel cells, reducing cost. Oxide-ion conductors with hexagonal perovskite related structures are rare. Herein, we report oxide-ion conductors based on a hexagonal perovskite-related oxide Ba7Nb4MoO20. Ba7Nb3.9Mo1.1O20.05 shows a wide stability range and predominantly oxide-ion conduction in an oxygen partial pressure range from 2 × 10−26 to 1 atm at 600 °C. Surprisingly, bulk conductivity of Ba7Nb3.9Mo1.1O20.05, 5.8 × 10−4 S cm−1, is remarkably high at 310 °C, and higher than Bi2O3- and zirconia-based materials. The high conductivity of Ba7Nb3.9Mo1.1O20.05 is attributable to the interstitial-O5 oxygen site, providing two-dimensional oxide-ion O1−O5 interstitialcy diffusion through lattice-O1 and interstitial-O5 sites in the oxygen-deficient layer, and low activation energy for oxide-ion conductivity. Present findings demonstrate the ability of hexagonal perovskite related oxides as superior oxide-ion conductors. Oxide-ion conductors are important in various applications for clean energy. Here, authors report high oxide-ion conductivity of hexagonal perovskite-related oxide Ba7Nb3.9Mo1.1O20.05, which is ascribed to the interstitialcy diffusion and low activation energy for oxide-ion conductivity.
Upendra K Sharma - One of the best experts on this subject based on the ideXlab platform.
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rhiii catalyzed dehydrogenative coupling of quinoline n oxides with alkenes n oxide as traceless directing group for remote c h activation
ChemInform, 2016Co-Authors: Ritika Sharma, Rakesh Kumar, Inder Kumar, Upendra K SharmaAbstract:A dehydrogenative coupling of quinoline N-Oxides with alkenes provides C(8)-olefinated quinoline derivatives by a remote C—H activation strategy.
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rhiii catalyzed dehydrogenative coupling of quinoline n oxides with alkenes n oxide as traceless directing group for remote c h activation
European Journal of Organic Chemistry, 2015Co-Authors: Ritika Sharma, Rakesh Kumar, Inder Kumar, Upendra K SharmaAbstract:A RhIII-catalyzed dehydrogenative coupling reaction of quinoline N-Oxides with alkenes has been developed that provides C-8 olefinated quinoline derivatives by employing a remote C–H activation strategy. Main features of this catalytic method include the use of N-Oxide as a traceless directing group, the high selectivity of the reaction for the C-8 position, and the broad scope of possible substrates. Mechanistic studies have also been performed. A five-membered rhodacycle of quinoline N-Oxide, a possible key reaction intermediate, was synthesized and characterized for the first time.
Rongliang Wang - One of the best experts on this subject based on the ideXlab platform.
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mild and efficient copper catalyzed n arylation of alkylamines and n h heterocycles using an oxime phosphine oxide ligand
Tetrahedron, 2005Co-Authors: Lei Xu, Fan Wu, Rongliang WangAbstract:Abstract A mild and efficient copper-catalyzed system for N-arylation of alkylamines and N–H heterocycles with aryl iodides using a novel, readily prepared and highly stable oxime-functionalized phosphine oxide ligand was developed. The coupling reactions could even be performed in solvent-free conditions with moderate to good yields.
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mild and efficient copper catalyzed n arylation of alkylamines and n h heterocycles using an oxime phosphine oxide ligand
Tetrahedron, 2005Co-Authors: Di Zhu, Rongliang Wang, Boshun WanAbstract:a mild and efficient copper-catalyzed system for n-arylation of alkylamines and n-h heterocycles with aryl iodides using a novel, readily prepared and highly stable oxime-functionalized phosphine oxide ligand was developed. the coupling reactions could even be performed in solvent-free conditions with moderate to good yields. (c) 2005 elsevier ltd. all rights reserved.
Masatomo Yashima - One of the best experts on this subject based on the ideXlab platform.
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high oxide ion conductivity through the interstitial oxygen site in ba7nb4moo20 based hexagonal perovskite related oxides
Nature Communications, 2021Co-Authors: Masatomo Yashima, Takafumi Tsujiguchi, Yuichi Sakuda, Yuta Yasui, Yu Zhou, Kotaro Fujii, Shuki Torii, Takashi Kamiyama, Stephen J SkinnerAbstract:Oxide-ion conductors are important in various applications such as solid-oxide fuel cells. Although zirconia-based materials are widely utilized, there remains a strong motivation to discover electrolyte materials with higher conductivity that lowers the working temperature of fuel cells, reducing cost. Oxide-ion conductors with hexagonal perovskite related structures are rare. Herein, we report oxide-ion conductors based on a hexagonal perovskite-related oxide Ba7Nb4MoO20. Ba7Nb3.9Mo1.1O20.05 shows a wide stability range and predominantly oxide-ion conduction in an oxygen partial pressure range from 2 × 10−26 to 1 atm at 600 °C. Surprisingly, bulk conductivity of Ba7Nb3.9Mo1.1O20.05, 5.8 × 10−4 S cm−1, is remarkably high at 310 °C, and higher than Bi2O3- and zirconia-based materials. The high conductivity of Ba7Nb3.9Mo1.1O20.05 is attributable to the interstitial-O5 oxygen site, providing two-dimensional oxide-ion O1−O5 interstitialcy diffusion through lattice-O1 and interstitial-O5 sites in the oxygen-deficient layer, and low activation energy for oxide-ion conductivity. Present findings demonstrate the ability of hexagonal perovskite related oxides as superior oxide-ion conductors. Oxide-ion conductors are important in various applications for clean energy. Here, authors report high oxide-ion conductivity of hexagonal perovskite-related oxide Ba7Nb3.9Mo1.1O20.05, which is ascribed to the interstitialcy diffusion and low activation energy for oxide-ion conductivity.
Jinmok Hur - One of the best experts on this subject based on the ideXlab platform.
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a conductive oxide as an o2 evolution anode for the electrolytic reduction of metal oxides
Electrochemistry Communications, 2015Co-Authors: Sungwook Kim, Eunyoung Choi, Wooshin Park, Jinmok HurAbstract:Abstract The feasibility of applying the conductive oxide, La 0.33 Sr 0.67 MnO 3 , as an O 2 evolution electrode in an electrochemical system was investigated. The La 0.33 Sr 0.67 MnO 3 anode was able to electrochemically reduce UO 2 to metallic U in a Li 2 O-containing LiCl molten salt electrolyte with O 2 evolution. Although the La 0.33 Sr 0.67 MnO 3 anode remained stable during the reaction, its long-term stability should be further investigated.
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A conductive oxide as an O2 evolution anode for the electrolytic reduction of metal oxides
Elsevier, 2015Co-Authors: Sungwook Kim, Eunyoung Choi, Wooshin Park, Jinmok HurAbstract:The feasibility of applying the conductive oxide, La0.33Sr0.67MnO3, as an O2 evolution electrode in an electrochemical system was investigated. The La0.33Sr0.67MnO3 anode was able to electrochemically reduce UO2 to metallic U in a Li2O-containing LiCl molten salt electrolyte with O2 evolution. Although the La0.33Sr0.67MnO3 anode remained stable during the reaction, its long-term stability should be further investigated. Keywords: Electrolytic reduction, Conductive oxide, Oxygen evolution electrode, Lanthanum strontium manganite, Pyroprocessin
