期刊
CHEMICAL PHYSICS LETTERS
卷 379, 期 3-4, 页码 230-235出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2003.07.026
关键词
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H-2 production from a water-acetonitrile mixed solution containing iodide electron donor was investigated over dye-sensitized Pt/TiO2 photocatalysts under visible light irradiation. Merocyanine and coumarin dyes were utilized as photosensitizers. The rates of H-2 evolution, which decreased with the increasing water amount in the mixed solutions, were ascribed to the decrease in energy gap between the redox potential of I-3(-)/I- and the HOMO level of the dye. The observed high rate of H-2 production even in an aqueous solution over a coumarin-sensitized Pt/TiO2 photocatalyst shows that the dye has a sufficiently positive HOMO level relative to the oxidation potential of I-. (C) 2003 Elsevier B.V. All rights reserved.
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