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Catalysis of Interfacial Transfer of Photo-Generated Electrons: A Study of Four Mo-S Complex Ions Mediating Electron Transfer across a Colloidal TiO2 Semiconductor-Liquid Interface

Donald Wycoff

ISBN 10: 3843367329 / ISBN 13: 9783843367325
Published by LAP LAMBERT Academic Publishing, 2010
Condition: Good Soft cover
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Bibliographic Details

Title: Catalysis of Interfacial Transfer of ...

Publisher: LAP LAMBERT Academic Publishing

Publication Date: 2010

Binding: Paperback

Book Condition:Good

About this title

Synopsis:

Four related trimeric molybdenum-sulfur complex ions were examined as electron transfer catalysts in the reduction of water and acetylene by UV sensitized colloidal TiO2 using polyvinyl alcohol and or methanol as sacrificial electron donors. The four ions [Mo3S4(OH2)9]4+, [Mo3FeS4(OH2)10]4+, [Mo3NiS4(OH2)10]4+ and [Mo3S4(CN)9]5- had quantum yields under low light conditions, at 313 nm, of 6.6, 4.7, 2.4 and 7.2% respectively. The pH dependence of the rate of product formation for each was found. Loading and light intensity effects were also studied. Light intensity results were interpreted in terms of a model which incorporates the heterogeneity of the surface hole trapping sites. In the acidic region a catalyst-colloid association for the [Mo3S4(OH2)9]4+ ion and for the [Mo3S4(CN)9]5- ion was demonstrated. The dependence of electron transfer rates on hole scavenger concentration was shown. Platinum catalyst experiments and control experiments without added catalyst were also done. The aquo, cyano and platinum catalysts all appear to be limited by the rate of hole transfer, and their relative effectiveness can not be distinguished.

About the Author:

Donald E. Wycoff was born in St. Louis, Missouri, USA in 1949. He received a BA in chemistry in 1974, MS in inorganic chemistry in 1988 and PhD in inorganic chemistry in 2004, all at the University of Missouri in Columbia, Missouri. In 1984 he married Wei Guo from Tianjin, PRC. They have two children, Eliot born in 1988 and Andrea born in 1991.

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