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WOx/TiO2光催化剂的可见光催化活性机理探讨
引用本文:张琦,李新军,李芳柏,常杰.WOx/TiO2光催化剂的可见光催化活性机理探讨[J].物理化学学报,2004,20(5):507-511.
作者姓名:张琦  李新军  李芳柏  常杰
作者单位:Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640;Department of Civil and Structural Engineering, Hong Kong Polytechnic University, Kowloon, Hong Kong
基金项目:广东省自然科学基金(010873)和广东省科技计划(A3040301)资助项目
摘    要:采用磁控溅射技术在用浸渍提拉法制得的TiO2薄膜上,溅射氧化钨层,通过气相反应中光催化降解二甲苯的实验表明,WOx/TiO2薄膜具有可见光活性.通过UV-Vis吸收光谱、X射线光电子能谱(XPS)等方法对其可见光活性的机理进行探索.UV-Vis吸收光谱表明WOx,TiO2对可见光响应的范围有一定的扩展,吸收强度增加.XPS表明WOx/TiO2薄膜表面形成了明显的W杂质能级和Ti缺陷能级,这是WOx/TiO2在可见光范围有一吸收的主要原因,也是光催化剂具有可见光活性的必要条件之一,同时杂质能级的存在使半导体费米能级上移,载流子增加,光催化效率提高.

关 键 词:光催化  可见光活性  XPS  费米能级  二氧化钛  磁控溅射  氧化钨  
收稿时间:2003-09-17
修稿时间:2003年9月17日

Investigation on Visible-light Activity of WO x/TiO2 Photocatalyst
Zhang Qi,Li Xin-Jun,Li Fang-Bai,Chang Jie.Investigation on Visible-light Activity of WO x/TiO2 Photocatalyst[J].Acta Physico-Chimica Sinica,2004,20(5):507-511.
Authors:Zhang Qi  Li Xin-Jun  Li Fang-Bai  Chang Jie
Institution:Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640;Department of Civil and Structural Engineering, Hong Kong Polytechnic University, Kowloon, Hong Kong
Abstract:The TiO2 thin films from dip-coating system were magnetron sputtered on with WOx, and can be activated by visible-light in gaseous dimethyl benzene photocatalytic degradation. The mechanism of its visible-light activity was investigated by UV-Vis absorption spectra and X-ray photoemission. UV-Vis absorption spectra showed its visible-light response expanding and having strong absorption with respect to the pure TiO2 film. XPS indicated the formation of W impurity energy level and Ti defect energy level, which was the main reason for the absorption in the visible-light range and the perquisite to have visible-light activity; and made Fermi level upper moved, free carriers more and photocatalytic efficiency enhanced.
Keywords:Photocatalysis  Activity under visible-light  XPS  Fermi level  Titanium dioxide  Magnetron sputtering  Tungsten oxide
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