Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 38, Issue 27, Pages 11709-11719Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2013.06.095
Keywords
SiW11O398-/TiO2; Eosin Y; Photosensitization; H-2 generation; Stability
Categories
Funding
- National Nature Science Foundation of China [21163012]
- National Basic Research Program of China [2009CB220003]
- Innovation Fund for Graduate Student of Nanchang University [cx2011007]
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Stability issue of dye limits greatly applications of sensitization systems. In the present work, TiO2 was modified with a lacunary Keggin-type polyoxometalate SiW11O398- (SiW11). SiW11 is bound at TiO2 by a chemical interaction and its modification promotes TiO2 crystallization as well as growth of the particles. The as-prepared SiW11/TiO2 was used to construct a stable and efficient system for visible-light H-2 generation using Eosin Y (EY) as a photosensitizer and Pt as a co-catalyst. SiW11 plays a very important role in enhancement of the sensitization activity and stability of SiW11/TiO2. SiW11 as an excellent electron relay greatly facilitates the electron transfer from the reduced dye species EY center dot- to conduction band (CB) of TiO2 and suppresses the decomposition of EY center dot-. Thus, a stable dye-sensitized hydrogen generation system is achieved. The factors which influenced the photocatalytic hydrogen evolution such as concentration of SiW11, concentration of EY, and Pt loading content were investigated. Under the optimal conditions, an average apparent quantum yield of 11.4% was obtained during 20 h irradiation (lambda > 420 nm). The possible mechanism was discussed. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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