Black phosphorus/Bi₂MoO₆ Z-scheme heterojunction for enhanced photocatalytic CO₂ reduction

Abstract

Photocatalytic CO2 reaction is considered to be an effective way to reduce greenhouse gas emission. Herein, a novel and efficient 2D/2D black phosphorus nanosheets (BPNS)-Bi2MoO6 photocatalyst was synthesized and used for photocatalytic CO2 reduction. Compared with Bi2MoO6, the photocatalytic activity of BPNS-Bi2MoO6 composite photocatalyst was significantly improved. When the mass ratio of BPNS to Bi2MoO6 was 1:100, the BPNS-Bi2MoO6 photocatalyst exhibited the optimal activity for photocatalytic CO2 reduction, and the production of CO reached 72.8 μmol·g-1 after reaction for 4 h, which was 1.5 times than that of Bi2MoO6. Moreover, the BPNS-Bi2MoO6 showed high stability for photocatalytic CO2 reduction reaction, after reaction for four cycle experiments, the production of CO only reduced by 10%. The enhanced light absortion, enhanced separation of electrons and holes, and the tight 2D/2D heterojunction formed between BPNS and Bi2MoO6 account for the high photocatalytic performance of BPNS/Bi2MoO6.