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Multielectron storage and hydrogen generation with colloidal semiconductors.

Authors
  • Grätzel, M1
  • Moser, J
  • 1 Institut de Chimie Physique, Ecole Polytechnique Fèdèrale, CH-1015 Lausanne, Switzerland. , (Switzerland)
Type
Published Article
Journal
Proceedings of the National Academy of Sciences
Publisher
Proceedings of the National Academy of Sciences
Publication Date
May 1983
Volume
80
Issue
10
Pages
3129–3132
Identifiers
PMID: 16593317
Source
Medline
License
Unknown

Abstract

Multielectron storage and hydrogen generation by light is achieved in aqueous dispersions of ultrafine TiO(2) particles (120-A diameter) when the amphiphilic viologen derivative N-tetradecyl-N'-methyl-4,4'-dipyridinium dichloride (C(14)MV(2+)) is used as an electron relay. Consecutive reduction of C(14)MV(2+) to the radical ion (C(14)MV(+)) and neutral (C(14)MV(0)) was observed after band-gap excitation of the semiconductor particle. Through surface adsorption of the relay, these electron-transfer reactions can occur very rapidly and are completed within less than 100 musec (pH 11). Two-electron reduction of C(14)MV(2+) can be coupled with H(2) generation in alkaline medium in the presence of Pt catalyst codeposited onto the TiO(2) particle. Electron-relay-free systems are 1/15th as efficient in producing H(2) at the same pH.

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