Nanostructured Metal Sulfides: Classification, Modification Strategy, and Solar‐Driven CO2 Reduction Application

Abstract Solar‐driven conversion of CO 2 into high value‐added fuels is expected to be an environmental‐friendly and sustainable approach for relieving the greenhouse gas effect and countering energy crisis. Metal sulfide semiconductors with wide photoresponsive range and favorable band structures are suitable photocatalysts for CO 2 photoreduction. This review summarizes the recent progress on metal sulfide semiconductors for photocatalytic CO 2 reduction. First, the fundamentals, mechanisms and some principles, like product selectivity, of photocatalytic CO 2 reduction are introduced. Then, according to the elemental composition, the metal sulfide photocatalysts applied for CO 2 reduction are classified into binary (CdS, ZnS, MoS 2 , SnS 2 , Bi 2 S 3 , In 2 S 3 ,Cu 2 S, NiS/NiS 2 , and CoS 2 ), ternary (ZnIn 2 S 4 , CdIn 2 S 4 , CuInS 2 , Cu 3 SnS 4 , and CuGaS 2 ), and quaternary (Cu 2 ZnSnS 4 ) systems, in which their crystal structures, photochemical characteristics, and photocatalytic CO 2 reduction applications are systematically demonstrated. Especially, the diverse modification strategies for improving the activity and product selectivity of photocatalytic CO 2 reduction on these metal sulfides are summarized. Finally, the current challenges and future directions for the development of metal sulfide photocatalysts for CO 2 reduction are proposed. This review is expected to serve as a powerful reference for exploiting high‐efficiency metal sulfide photocatalysts for CO 2 conversion and furthering related mechanism understanding.