Hydride Reductions of Transition Metal Oxides

• Takafumi Yamamoto

  Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University

• Hiroshi Kageyama

  Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University

Abstract

Low-temperature reactions are a powerful approach to generate new transition metal oxides that are inaccessible by conventional high-temperature reactions. In this review, we describe the recent progress of the topochemical reduction method using metal hydrides for transition metal oxides, in particular, focusing on structural modifications (relations), chemical and physical properties, and the factors that direct selective and rational preparations. The hydride reduction has been so far extensively applied to 3d transition metal perovskite oxides, yielding highly reduced products with unusual coordination environment (e.g., FeO4 square-planar coordination), and extremely low-valent metal centers (e.g., Mn(I) and Co(I)). Non-perovskite oxides like pyrochlore and hexagonal perovskite can be also reduced. Moreover, this method allows access to oxyhydride materials (LaSrCoO3H0.7 and BaTiO3−xHx) that are promising for use as hydride ion conductors. Morphology-controlled oxides (thin film- and nano-oxides) are useful targets for hydride reduction, opening new possibilities for extending functions.

Journal

• Chemistry Letters

  Chemistry Letters 42 (9), 946-953, 2013-07-18

  Oxford University Press (OUP)

Keywords

• General Chemistry

Details

• CRID: 1360002219105426176
• NII Article ID: 10031194305
• NII Book ID: AA00603318
• DOI: 10.1246/cl.130581
• ISSN: 13480715
• ISSN: 03667022
• Web Site: https://academic.oup.com/chemlett/article-pdf/42/9/946/55642160/cl.130581.pdf
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