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International Journal of Photoenergy
Volume 2012, Article ID 843042, 10 pages
Research Article

High-Efficiently Photoelectrochemical Hydrogen Production over Zn-Incorporated T i O 2 Nanotubes

1Department of Chemistry, College of Science, Yeungnam University, Gyeongsan, Gyeongbuk 712-749, Republic of Korea
2Department of Environmental Science and Environmental Research, College of Engineering, Kyung Hee University, Yongin, Gyeonggi 446-701, Republic of Korea
3Department of Chemical Engineering, College of Engineering, Kongju National University, Cheonan, Chungnam 330-717, Republic of Korea

Received 3 February 2012; Revised 21 March 2012; Accepted 22 March 2012

Academic Editor: Baibiao Huang

Copyright © 2012 Gayoung Lee 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.


To investigate the Zn dopant and nanotube morphology effects of TiO2 in electrochemical hydrogen production from the photo-splitting of methanol/water solution, we have designed a Zn-incorporated TiO2 nanotube (Zn-TNT) photocatalyst. The TNT and Zn-TNT materials had a width of 70~100 nm. The hydrogen production over the Zn-TNT photocatalysts was higher than that over the TNT; specifically, 10.2 mL of H2 gas was produced after 9 hours when 0.5 g of 0.01 mol% Zn-TNT was used. The zeta-potential values in aqueous solution determined by electrophoretic light scattering (ELS) had negative surface charges, which was related to the surface stability, and the absolute value was the largest in 0.01 mol% Zn-TNT. On the basis of UV-visible and photoluminescence (PL) spectra results, the high photoactivity of Zn-TNT was attributed to the shift toward the visible region and increase of PL intensity due to the increased number of excited electrons and holes.