Photoelectrochemical and photocatalytic activity of tungsten doped TiO2 nanotube layers in the near visible region

被引:46
作者
Das, C. [1 ]
Paramasivam, I. [1 ]
Liu, N. [1 ]
Schmuki, P. [1 ]
机构
[1] Univ Erlangen Nurnberg, Dept Mat Sci, D-91058 Erlangen, Germany
关键词
TiO2 nanotubular layer; TiW alloy; Tungsten doping; Photoelectrochemical measurements; Photocatalysis; Electrochemistry; MIXED-METAL OXIDES; TITANIUM-DIOXIDE; WO3; ANODIZATION; ELECTRODES; SURFACES; FILMS; WATER;
D O I
10.1016/j.electacta.2011.05.061
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
In the present work we study the effect of WO3 doping on the photo-electrochemical behavior of self-organized TiO2 nanotube layers. Mixed oxide nanotubes were grown by anodization of Ti-W alloys containing 0.2 and 9% W, with a thicknesses of the oxide nanotube layers adjusted to about 1.1-1.2 mu m. We show that by WO3 doping, the near visible photoresponse and photocatalytic performance can drastically be enhanced. While a content of 9 at% WO3 in photoresponse experiments is most beneficial, in long term experiments a higher efficiency is observed for the 0.2 at% W content. This is due to a gradual leaching of WO3 (dissolution into the electrolyte) for the higher WO3 content. This demonstrates that under optimized WO3 doping conditions a lasting visible light activation of TiO2 nanotubes can be achieved. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码:10557 / 10561
页数:5
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