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International Journal of Photoenergy
Volume 2012 (2012), Article ID 832516, 7 pages
http://dx.doi.org/10.1155/2012/832516
Research Article

Investigation on the Photoelectrocatalytic Activity of Well-Aligned TiO2 Nanotube Arrays

1School of Materials Science and Technology, China University of Geosciences-Beijing, Beijing 100083, China
2School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

Received 29 August 2011; Revised 5 November 2011; Accepted 5 November 2011

Academic Editor: Jiaguo Yu

Copyright © 2012 Xiaomeng Wu 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

Well-aligned TiO2 nanotube arrays were fabricated by anodizing Ti foil in viscous F containing organic electrolytes, and the crystal structure and morphology of the TiO2 nanotube array were characterized and analyzed by XRD, SEM, and TEM, respectively. The photocatalytic activity of the TiO2 nanotube arrays was evaluated in the photocatalytic (PC) and photoelectrocatalytic (PEC) degradation of methylene blue (MB) dye in different supporting solutions. The excellent performance of ca. 97% for color removal was reached after 90 min in the PEC process compared to that of PC process which indicates that a certain external potential bias favors the promotion of the electrode reaction rate on TiO2 nanotube array when it is under illumination. In addition, it is found that PEC process conducted in supporting solutions with low pH and containing Cl is also beneficial to accelerate the degradation rate of MB.