Acta Phys. -Chim. Sin. ›› 2004, Vol. 20 ›› Issue (05): 507-511.doi: 10.3866/PKU.WHXB20040513

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Investigation on Visible -light Activity of WOx/TiO2 Photocatalyst

Zhang Qi;Li Xin-Jun;Li Fang-Bai;Chang Jie   

  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:2003-09-17 Revised:2004-01-03 Published:2004-05-15
  • Contact: Zhang Qi

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 words: Photocatalysis, Activity under visible-light, XPS, Fermi level,  Titanium dioxide, Magnetron sputtering, Tungsten oxide