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Acta Phys. -Chim. Sin.  2004, Vol. 20 Issue (05): 507-511    DOI: 10.3866/PKU.WHXB20040513
Article     
Investigation on Visible -light Activity of WOx/TiO2 Photocatalyst
Zhang Qi;Li Xin-Jun;Li Fang-Bai;Chang Jie
Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640;Department of Civil and Structural Engineering, Hong Kong Polytechnic University, Kowloon, Hong Kong
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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.

Key wordsPhotocatalysis      Activity under visible-light      XPS      Fermi level       Titanium dioxide      Magnetron sputtering      Tungsten oxide     
Received: 17 September 2003      Published: 15 May 2004
Corresponding Authors: Zhang Qi     E-mail: zhangqi@ms.giec.ac.cn
Cite this article:

Zhang Qi;Li Xin-Jun;Li Fang-Bai;Chang Jie. Investigation on Visible -light Activity of WOx/TiO2 Photocatalyst. Acta Phys. -Chim. Sin., 2004, 20(05): 507-511.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB20040513     OR     http://www.whxb.pku.edu.cn/Y2004/V20/I05/507

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