Chalcogenides and Other Non-oxidic Semiconductors
Although oxidic materials constitute the main group of semiconductors employed for photocatalytic applications, some non-oxide compounds have been used for these purposes too. After oxides, sulphides are the most widely used photocatalysts, with special importance in water splitting applications. CdS and ZnS are two of the “classical” photocatalysts, which have been used since the early beginning of the research in this field. In particular, CdS presents the advantage of absorbing visible light (E g = 2.4 eV), and it has become somewhat a “standard” photocatalyst for reactions undertaken under visible irradiation. More recently, some other sulphides, like ternary sulphides and solid solutions, have shown interesting photocatalytic properties. However, sulphides present the drawback of suffering anodic photocorrosion unless prevented with certain reaction conditions or with special modifications, which limits their applications as we will see below. At the end of the chapter, selenides and other non-oxidic semiconductors will be overviewed.
KeywordsPhotocatalytic Activity Hydrogen Evolution Visible Light Irradiation Water Splitting Valence Band Maximum
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