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Unusual photoelectrochemical behaviour of nanocrystalline TiO2films

Authors
Journal
Inorganica Chimica Acta
0020-1693
Publisher
Elsevier
Publication Date
Volume
361
Issue
3
Identifiers
DOI: 10.1016/j.ica.2007.05.037
Keywords
  • Nanocrystalline Titanium Dioxide
  • Semiconductor Film Photoanode
  • Photooxidation Reactions
  • Photocurrent Efficiency

Abstract

Abstract Although photooxidation of water and numerous other species which are part of reversible redox couples is poorly efficient at nanocrystalline TiO 2, conversely high photocurrent efficiencies are observed for the oxidation of various organic molecules. This is associated with the fact that in most cases photooxidation of organic molecules does not produce species able to act as electron scavengers. The behaviour of nanocrystalline TiO 2 photoelectrodes is clearly dominated by the indirect recombination or redox cycling where intermediates or products of the hole transfer act in turn as electron scavengers. These processes occur whatever the applied anodic bias showing that the actual potential in most of the nanocrystalline TiO 2 film is disconnected from that imposed to the conducting substrate.

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