Microheterogeneous Systems Sample Clauses

Microheterogeneous Systems. Here the semiconductor is in the form of tiny particles suspended in a solvent (usually an aqueous solution). [The book by Xxxxxxxxxxxxxxx (1987) provides a good overview of this subject.] The process operates much like the reduction half reaction of the photochemical system, except that the semiconductor particle takes the place of the molecular absorber. Excess conduction-band electrons reduce the electron relay and excess holes oxidize the sacrificial donor. n-TiO2, n-SrTiO3 and n-CdS have been used in this manner [see reviews by Xxxxxxx (0000x) and Xxxxxxx and Xxxxxxxxxxx-Xxxxxxx (1988)]. There have been some attempts to load a semiconductor, such as TiO2, with Pt and RuO2 islands, which act as reduction and oxidation catalysts, respectively. Some unconfirmed claims of complete water photolysis have been reported (Borgarello et al., 1981a,b) with this system, but the results have been strongly criticized (Xxxxxxx and Xxxxxxxxxxx-Xxxxxxx, 1988).
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Microheterogeneous Systems. These systems suffer from most of the same disadvantages as the photochemical systems (Section 5.1). It is not likely that viable systems will be developed based on this option.

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