Active Site Considerations on the Photocatalytic H2 Evolution Performance of Cu-Doped TiO2 Obtained by Different Doping Methods

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• 作者：Juan M. Valero ; Sergio Obreg贸n ; Gerardo Col贸n
• 刊名：ACS Catalysis
• 出版年：2014
• 出版时间：October 3, 2014
• 年：2014
• 卷：4
• 期：10
• 页码：3320-3329
• 全文大小：655K
• ISSN：2155-5435

文摘

A photocatalytic H₂ evolution reaction was performed over copper doped TiO₂. The influence of sulfate pretreatment over fresh TiO₂ support and the Cu doping method has been evaluated. Wide structural and surface characterization of catalysts was carried out in order to establish a correlation between the effect of sulfuric acid treatment and the further Cu-TiO₂ photocatalytic properties. Notably a different copper dispersion and oxidation state is obtained by different metal decoration methods. From the structural and surface analysis of the catalysts we have stated that the occurrence of highly disperse and reducible Cu²⁺ species is directly related to the photocatalytic activity for the H₂ production reaction. Highly active materials have been obtained from a chemical reduction method leading to 18 mmol路h^鈥?路g^鈥? for 3 mol % copper loading.

Keywords:

Cu-TiO₂; photocatalysis; active site; sulfation; H₂ evolution