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International Journal of Photoenergy
Volume 2012, Article ID 794207, 7 pages
http://dx.doi.org/10.1155/2012/794207
Research Article

Nitrogen-Doped TiO2 Nanotube Arrays with Enhanced Photoelectrochemical Property

Key Laboratory of Ministry of Education for Application Technology of Chemical Materials in Hainan Superior Resources, School of Materials and Chemical Engineering, Hainan University, Haikou 570228, China

Received 22 January 2012; Revised 22 February 2012; Accepted 27 February 2012

Academic Editor: Xuxu Wang

Copyright © 2012 Shipu Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

N-doped TiO2 nanotube arrays were prepared by electrochemical anodization in glycerol electrolyte, followed by electrochemical deposition in NH4Cl solution. An orthogonal experiment was used to optimize the doping conditions. Electrolyte concentration, reaction voltage, and reaction time were the main factors to influence the N-doping effect which was the determinant of the visible range photoresponse. The optimal N-doping conditions were determined as follows: reaction voltage is 3 V, reaction time is 2 h, and electrolyte concentration is 0.5 M. The maximal photocurrent enhanced ratio was 30% under white-light irradiation. About 58% improvement of photocatalytic efficiency was achieved in the Rhodamine B degradation experiment by N doping. The kinetic constant of the N-doped TNT arrays sample was almost twice higher than that of the undoped sample. Further analysis by X-ray photoelectron spectroscopy supported that electrochemical deposition is a simple and efficient method for N doping into TiO2 nanotube arrays.