Encyclopedia of Applied Electrochemistry

2014 Edition
| Editors: Gerhard Kreysa, Ken-ichiro Ota, Robert F. Savinell

Photocatalyst

Reference work entry
DOI: https://doi.org/10.1007/978-1-4419-6996-5_497

Definition

Photocatalysts are materials that induce photocatalytic reaction under photoirradiation. A general definition of photocatalysis, a conceptual name of photocatalytic reactions, is a chemical reaction induced by photoabsorption of a solid material, or “photocatalyst,” which remains unchanged during the reaction. Therefore, “photocatalyst” should act catalytically, i.e., without change, under light. Although molecules or metal complexes dissolved in solution or in the gas phase, not solid materials, can drive such photoinduced reactions without change during the reactions, they are called “photosensitizer” but not “photocatalyst.” photoinduced reactions are, in principle, initiated by photoabsorption, i.e., excitation of electrons in a material, followed by electron transfer from/to a reaction substrate. The photoexcited electrons can reduce a substrate adsorbed on the surface of a photocatalyst, and positive holes, electron deficiencies, can oxidize an adsorbed substrate, if...

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References

  1. 1.
    Ohtani B (2008) Preparing articles on photocatalysis―beyond the illusions, misconceptions and speculation. Chem Lett 37(3):216–229Google Scholar
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    Ohtani B (2010) Photocatalysis A to Z―what we know and what we don’t know. J Photochem Photobiol C Photochem Rev 11(4):157–178Google Scholar
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    Ohtani B (2011) Photocatalysis by inorganic solid materials: revisiting its definition, concepts, and experimental procedures. Adv Inorg Chem 63:395–430Google Scholar

Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Catalysis Research CenterHokkaido UniversitySapporoJapan