Elsevier

Advances in Catalysis

Volume 23, 1973, Pages 157-208
Advances in Catalysis

The Electronic Theory of Photocatalytic Reactions on Semiconductors

https://doi.org/10.1016/S0360-0564(08)60301-6Get rights and content

Publisher Summary

This chapter discusses the mechanism of the photocatalytic effect and the influence of illumination on the adsorption and catalytic properties of a surface. The chapter focuses on the electronic theory of photocatalytic reactions on semiconductors. A clue to the understanding of the photocatalytic effect is the electronic theory of catalysis on semiconductors. The existence and the basic regularities of the photocatalytic effect follow directly from the electronic theory of catalysis. According to the electronic theory, a particle chemisorbed on the surface of a semiconductor has a definite affinity for a free electron or for a free hole in the lattice. The chemisorbed particle is presented in the energy spectrum of the lattice as an acceptor and in the second as a donor surface local level situated in the forbidden zone between the valency band and the conduction band. In the general, the same particle may possess an affinity both for an electron and a hole.

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