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WO3 Doping Effects on the Photoelectrocatalytic Activity of TiO2 Nanotube Film Prepared by an Anodization Process

Published online by Cambridge University Press:  01 February 2011

Hei Lok Tsai ,
Micheal K.H. Leung ,
Gui Sheng Li  and
Dennis C.Y. Leung
Hei Lok Tsai
Affiliation:
[email protected]@hotmail.com, The University of Hong Kong, Mechanical Engineering, Hong Kong, Hong Kong
Micheal K.H. Leung
Affiliation:
[email protected], The University of Hong Kong, Mechanical Engineering, Hong Kong, Hong Kong
Gui Sheng Li
Affiliation:
[email protected], The University of Hong Kong, Mechanical Engineering, Hong Kong, Hong Kong
Dennis C.Y. Leung
Affiliation:
[email protected], The University of Hong Kong, Mechanical Engineering, Hong Kong, Hong Kong
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Abstract

WO3 doped TiO2 nanotube(WO3-doped TNT) thin film was fabricated by anodizing the TiO2 nanotube (TNT) film in an NH4F electrolyte containing WO4- ions. The sample was characterized by Field Emission Scanning Electron Microscopy (FE-SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and UV–Vis diffuse reflectance spectroscopy (DRS). The results show that WO3 was successfully doped into TiO2 nanotubes and the absorption edge of WO3 doped TNT appeared to be red shifted. The photoelectrocatalytic (PEC) activity of WO3 doped TNT electrode was evaluated through the PEC degradation of aqueous Acid Blue 80. The experimental results demonstrated that the PEC degradation rate of WO3 doped TNT is increased by 48% and by 167% over that of non-doped TNT under UVA light irradiation and visible-light irradiation, respectively, at an applied potential of 1.54V. The degradation rates of WO3 doped TNT under photocatalytic (PC), electrochemical (EC), and PEC processes were compared. The results reveal the synergetic effect of PC and EC processes.

Keywords

Welectrochemical synthesisTi
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1258: Symposia P/Q/R – Low-Dimensional Functional Nanostructures-Fabrication, Characterization and Applications , 2010 , 1258-Q05-06
Copyright
Copyright © Materials Research Society 2010

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