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Citation: 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(05): 507-511. doi: 10.3866/PKU.WHXB20040513 shu

Investigation on Visible -light Activity of WO_x/TiO₂ Photocatalyst

1.
Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou　510640;Department of Civil and Structural Engineering, Hong Kong Polytechnic University, Kowloon, Hong Kong

Received Date: 17 September 2003
Available Online: 15 May 2004

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.
- Photocatalysis;Activity under visible-light;XPS;Fermi level;　Titanium dioxide;Magnetron sputtering;Tungsten oxide
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Investigation on Visible -light Activity of WOx/TiO2 Photocatalyst

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通讯作者: 陈斌, bchen63@163.com

Investigation on Visible -light Activity of WO_x/TiO₂ Photocatalyst