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Photocatalytic Formation of Sulfur-Centered Radicals by One-Electron Redox Processes on Semiconductor Surfaces

  • Detlef Bahnemann
Part of the NATO ASI Series book series (NSSA, volume 197)

Abstract

Free radical reactions cannot only be initiated and conveniently studied by radiation- or photo-chemical methods, but it is also possible to generate reactive free radical intermediates upon band-gap illumination of semiconducting materials. Depending on the individual material properties it is possible, for example, in an aqueous solvent to form primary radicals such as hydroxyl and sulfhydrol radicals or hydrated electrons. It is the microscopic structure of the semiconductor/electrolyte interface which determines the fate of these radical species: they may either diffuse into the bulk of the solution and initiate subsequent redox reactions like in a homogeneous system, or they are strongly adsorbed to the surface resulting in specific paths of the consecutive processes at the interface.

Keywords

Conduction Band Electron Transient Absorption Spectrum Normal Hydrogen Electrode Semiconductor Particle Metal Oxide Particle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1990

Authors and Affiliations

  • Detlef Bahnemann
    • 1
  1. 1.Institut für Solarenergieforschung GmbHHannover 1F. R. Germany

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