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International Journal of Photoenergy
Volume 2008 (2008), Article ID 173943, 7 pages
http://dx.doi.org/10.1155/2008/173943
Research Article

Photocatalytic Hydrogen or Oxygen Evolution from Water over S- or N-Doped TiO2 under Visible Light

Department of Material Science, Faculty of Engineering, Kyushu Institute of Technology, 1-1 Sensui-cho, Tobata-ku, Fukuoka, Kitakyushu-shi 804-8550, Japan

Received 20 March 2007; Accepted 22 May 2007

Academic Editor: M. Sabry A. Abdel-Mottaleb

Copyright © 2008 Kazumoto Nishijima 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

S- or N-doping of powder having an anatase or rutile phase extended the photocatalytic activity for water oxidation and reduction under UV light and visible light irradiation. For the reduction of water, anatase-doped showed higher level of activity than that of doped having a rutile phase using ethanol as an electron donor. Furthermore, the activity level of S-doped for hydrogen evolution was higher than that of N-doped photocatalysts under visible light. Photocatalytic oxidation of water on doped having a rutile phase proceeded with fairly high efficiency when ions were used as electron acceptors compared to that on doped having an anatase phase. In addition, water splitting under visible light irradiation was achieved by construction of a Z-scheme photocatalysis system employing the doped having anatase and rutile phases for and evolution and the redox couple as an electron relay.