Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 35, Issue 13, Pages 6531-6540Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2010.04.015
Keywords
Gold loading; Strontium titanate; Mesoporous assembly; Sol-gel method; Structure-directing surfactant; Photocatalytic hydrogen production
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Funding
- Commission on Higher Education, Ministry of Education, Thailand
- Thailand Research Fund (TRF)
- Commission on Higher Education, Thailand
- Sustainable Petroleum and Petrochemicals Research Unit, Center for Petroleum, Petrochemicals
- Advanced Materials, Chulalongkom University, Thailand
- Petrochemical and Environmental Catalysis Research Unit
- Ratchadapisek Somphot Endowment Fund, Chulalongkorn University, Thailand
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Mesoporous-assembled SrTiO3 photocatalysts with different loaded metal co-catalysts (Au, Pt, Ag, Ni, Ce, and Fe) synthesized by the single-step sol-gel method with the aid of a structure-directing surfactant were tested for the photocatalytic activity of hydrogen production from a methanol aqueous solution under both UV and visible light irradiation. The Au, Pt, Ag, and Ni loadings had a positive effect on the photocatalytic activity enhancement, whereas the Ce and Fe loadings did not. The best loaded metal was found to be Au due to its electrochemical properties compatible with the SrTiO3-based photocatalyst and its visible light harvesting enhancement. A 1 wt.% Au-loaded SrTiO3 photocatalyst exhibited the highest photocatalytic hydrogen production activity with a hydrogen production rate of 337 and 200 mu mol h(-1) g(cat)(-1) under UV and visible light irradiation, respectively. The hydrogen diffusivity from the liquid phase to the gas phase also significantly affected the photocatalytic hydrogen production efficiency. An increase in the hydrogen diffusability led to an increase in the photocatalytic hydrogen production efficiency. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
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