CdS-based S-scheme photocatalyst

Cadmium sulfide (CdS) has gained wide attention in photocatalysis owing to its suitable band structure. However, there are inherent drawbacks of unitary CdS such as the rapid recombination of photogenerated electron–hole pairs and severe photocorrosion, which result in low photocatalytic activity. Constructing S-scheme heterojunctions between CdS and other semiconductors is a promising strategy to suppress carrier recombination and alleviate photocorrosion by separating photogenerated electrons and holes. This chapter aims to provide knowledge on CdS-based S-scheme photocatalysts through case studies. Herein, the basic physical and chemical properties of CdS will be introduced, and its preparation methods will be summarized. Subsequently, three representative CdS-based S-scheme photocatalysts will be discussed with special focuses on their synthesis, photocatalytic performance, and the S-scheme charge carrier transfer mechanism. Finally, a brief perspective on the development of CdS-based S-scheme photocatalysts will be presented.