Construction of WO/CsPbBr S-scheme heterojunction via electrostatic Self-assembly for efficient and Long-Period photocatalytic CO reduction.

Owing to the severe photogenerated carriers recombination and low oxidation ability, the photocatalytic performance of pristine CsPbBr is still unsatisfactory. Herein, melamine foam supported S-scheme WO/CsPbBr heterojunction is successfully synthesized by electrostatic self-assembly. Because of the appropriate energy level positions, an S-scheme charge migration route between CsPbBr and WO is constructed. Under solar light irradiation, melamine foam assisted WO/CsPbBr exhibits significantly enhanced photocatalytic CO reduction performance under liquid HO medium, and the electron consumption rate (R) reaches to 1225.50 μmolgh, which is 1.49- and 13.7-fold of CsPbBr and WO, respectively, ascribing to the boosted charges transfer and the strengthened redox ability. Furthermore, S-scheme WO/CsPbBr heterojunction also exhibits strong durability, with no noticeable reduction of product yields after four 8-h cycles.