Preparative and Mechanistic Semiconductor Photocatalysis

Authored by: Horst Kisch , Dariusz Mitoraj

CRC Handbook of Organic Photochemistry and Photobiology

Print publication date:  March  2012
Online publication date:  March  2012

Print ISBN: 9781439899335
eBook ISBN: 9781466561250
Adobe ISBN:

10.1201/b12252-14

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Abstract

The chemical conversion and utilization of solar energy is a central topic of general photochemistry. In addition to solar water splitting, the “holy grail” of photochemistry, also cleaning of air and water through aerial photooxidation, fixation of nitrogen and carbon dioxide, and organic syntheses have received considerable attention in research of the last three decades. In general, the most relevant primary reaction steps are the light-induced generation of charges followed by their utilization in electron exchange reactions with substrates. Whereas many systems easily undergo the first step, charge recombination usually prevents the second step, which is essential for the chemical utilization of light energy. The crucial point in the development of an efficient system is therefore how to slow down recombination in favor of electron exchange. Depending on the detailed nature of the system involved, in many cases a sensitizer is necessary to allow utilization visible light, which constitutes about 45% of the solar light arriving at the earth’s surface.

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