Efficient Photocatalytic Hydrogen Evolution from Water without an Electron Mediator over Pt−Rose Bengal Catalysts

A highly efficient visible-light-induced hydrogen evolution system without an electron mediator such as methyl viologen, constructed with rose bengal as a photosensitizer, triethanolamine (TEA) as an electron donor, and Pt as a cocatalyst, has been reported. Under visible light irradiation (λ ≥ 420...

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Bibliographic Details
Published in:Journal of physical chemistry. C 2009-02, Vol.113 (6), p.2630-2635
Main Authors: Zhang, Xiaojie, Jin, Zhiliang, Li, Yuexiang, Li, Shuben, Lu, Gongxuan
Format: Article
Language:English
Subjects:
C: Energy Conversion and Storage
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Summary:A highly efficient visible-light-induced hydrogen evolution system without an electron mediator such as methyl viologen, constructed with rose bengal as a photosensitizer, triethanolamine (TEA) as an electron donor, and Pt as a cocatalyst, has been reported. Under visible light irradiation (λ ≥ 420 nm), the highest rate of hydrogen evolution and apparent quantum efficiency are about 56.9 μmol h−1 and 11.3%, respectively. According to the effects of urea and ionic strength on the activity of hydrogen evolution, the dimers of rose bengal play a significant role in the photosensitized hydrogen evolution process. On the basis of activity tests and UV−vis absorbance and fluorescence measurements, the probable mechanism for photosensitized hydrogen evolution has been postulated.
ISSN:1932-7447
1932-7455
DOI:10.1021/jp8085717