Chalcogenides substrate effects

Most common metal oxide and metal chalcogenide semiconductors have valence-band edges that lie positive of the oxidation potentials of most organic functional groups, and thermodynamics will thus favor photocatalytic oxidation. For efficient processes to take place, an easily oxidizable donor is required, but a whole range of substrates have been shown to be useful for this application. For example, a Japanese group has shown that this purpose is served not only by pure compounds, but even by wastes such as polyvinyl chloride, algae, protein, dead insects, and animal excrement, which function as electron sources [104]. Thus, synthetic utility is attained only if this wide reactivity is controlled. In practice, selectivity is best controlled by the adsorption and oxidation potential effects [105],... 

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