Elucidating the Domain Structure of the Cobalt Oxide Water Splitting Catalyst by X-ray Pair Distribution Function Analysis

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• 作者：Pingwu Du ; Oleksandr Kokhan ; Karena W. Chapman ; Peter J. Chupas ; David M. Tiede
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：July 11, 2012
• 年：2012
• 卷：134
• 期：27
• 页码：11096-11099
• 全文大小：264K
• 年卷期：v.134,no.27(July 11, 2012)
• ISSN：1520-5126

文摘

Pair distribution function (PDF) analysis was applied for structural characterization of the cobalt oxide water-splitting catalyst films using high energy X-ray scattering. The catalyst was found to be composed of domains consistent with a cobalt dioxide lattice sheet structure, possibly containing a Co₄O₄ cubane-type 鈥渄efect鈥? The analysis identifies the film to consist of domains composed of 13鈥?4 cobalt atoms with distorted coordination geometries that can be modeled by alteration in terminal oxygen atom positions at the domain edge. Phosphate is seen as a disordered component in the films. This work establishes an approach that can be applied to study the structure of in situ cobalt oxide water-splitting film under functional catalytic conditions.