Tatsumi Ishihara

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDoped LaGaO3 Perovskite Type Oxide as a New Oxide Ionic ConductorTatsumi Ishihara, Hideaki Matsuda, and Yusaku TakitaCite this: J. Am. Chem. Soc. 1994, 116, 9, 3801–3803Publication Date (Print):May 1, 1994Publication History Published online1 May 2002Published inissue 1 May 1994https://pubs.acs.org/doi/10.1021/ja00088a016https://doi.org/10.1021/ja00088a016research-articleACS PublicationsRequest reuse permissionsArticle Views6405Altmetric-Citations1294L

Artificial photosynthesis from CO₂ reduction is severely hampered by the kinetically challenging multi-electron reaction process. Oxygen vacancies (Vo) with abundant localized electrons have great potential to overcome this limitation. However, surface Vo usually have low concentrations and are easily oxidized, causing them to lose their activities. For practical application of CO₂ photoreduction, fabricating and enhancing the stability of Vo on semiconductors is indispensa

‐based perovskite oxides doped with Sr and Mg exhibit high ionic conductivity over a wide range of oxygen partial pressure. In this study, the stability of ‐based oxide was investigated. The ‐based oxide was found to be very stable in reducing, oxidizing, and atmospheres. Solid oxide fuel cells (SOFCs) using ‐based perovskite‐type oxide as the electrolyte were studied for use in intermediate‐temperature SOFCs. The power‐generation characteristics of cells were strongly affected by the electrodes

It was found for the first time that controlling the charge density in oxide semiconductors with an acceptor was effective for improving the activity to photolysis of H2O. Although the photodecomposition activity of NiO supported on nondoped KTaO3 was negligibly small, doping small amount of acceptors such as tri- or tetravalent cations to KTaO3 increased the formation rate of H2 and O2. In particular, it was found that NiO supported on KTaO3 doped with 8 mol % Zr4+ exhibits higher activity to t

Electrochemical intercalation of into various carbons was studied for the cathode of an Li-ion rechargeable battery. It was found that the capacity of the electrochemical intercalation of increases with decreasing (002) plane distance, namely, increasing the crystallinity of graphitic-carbon, and the largest capacity was achieved on the carbon with almost ideal graphitic-carbon structure. By using graphitic carbon with high crystallinity and the stable electrolyte of ethylene carbonate-dimethyle

Obtaining bifunctional electrocatalysts with high activity for the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) is a main hurdle in the application of rechargeable metal-air batteries. Earth-abundant 3d transition metal-based catalysts have been developed for the OER and ORR; however, most of these are based on oxides, whose insulating nature strongly restricts their catalytic performance. This study describes a metallic Ni-Fe nitride/nitrogen-doped graphene hybrid in whic

An electrophoretic deposition (EPD) method was applied for the preparation of yttria‐stabilized zirconia (YSZ) films for solid oxide fuel cell (SOFC) applications. Dense YSZ films with uniform thickness can be readily prepared with the EPD method by using acetylacetone or acetone as a solvent. The open‐circuit voltages of SOFC, for which the YSZ films were prepared by the EPD method, increased with increasing repetitions of deposition and sintering. It was found that the open‐circuit voltage exc

Oxide capacitors consisting of and an oxide are studied as a sensor for detection. Although the capacitance change of on exposure to was small, it was greatly enhanced by the combination with . Sensitivity to and optimum operating temperature were strongly dependent on the oxide combined with . The element which contains basic oxides such as and , is highly sensitive to , but the operating temperature exceeded 1073 K. Among the elements investigated in this study, exhibited the highest sensitivi

Cathodic overpotentials of were studied for a new cathode of solid oxide fuel cell (SOFC). Cathodic overpotentials as well as the electrical conductivity strongly depended on the rare earth cations used for the A sites of perovskite oxide. Strontium doped exhibited the highest electrical conductivity among the examined perovskite oxide containing Mn for B sites. Moreover, overpotentials of Sr‐doped cathode maintained low values in spite of decreasing the operating temperature. Consequently, almo

Two-dimensional (2D) layered MnO2 materials, composed of exotic electronic properties and accessible active sites with alkali metal ions, provide a comprehensive platform for developing catalysts with chemical modification. Significantly, K+-contained layered MnO2 catalysts have been verified as strong candidates toward catalytic oxidation of formaldehyde (HCHO). Unveiling the effects of alkali metal ions on active sites is critical to understand the interaction between reactants and active cent