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

Abstract

Abstract The photocatalytic CO 2 reaction is considered to be an effective way to reduce greenhouse gas emissions. This paper presents how a novel and efficient 2D/2D black phosphorus nanosheets (BPNS)–Bi 2 MoO 6 photocatalyst was synthesized and used for photocatalytic CO 2 reduction. Compared to Bi 2 MoO 6 , the photocatalytic activity of the BPNS–Bi 2 MoO 6 composite photocatalyst was significantly improved. When the mass ratio of BPNS to Bi 2 MoO 6 was 1:100, the BPNS–Bi 2 MoO 6 photocatalyst exhibited optimal activity for photocatalytic CO 2 reduction, and the production of CO reached 72.8 μ mol g −1 after reaction for 4 h, which is 1.5 times more than that of Bi 2 MoO 6 . Moreover, the BPNS–Bi 2 MoO 6 showed high stability for the photocatalytic CO 2 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 Bi 2 MoO 6 account for the high photocatalytic performance of BPNS/Bi 2 MoO 6 .