WO 3 /BiOBr S-Scheme Heterojunction Photocatalyst for Enhanced Photocatalytic CO 2 Reduction.

The photocatalytic CO 2 reduction strategy driven by visible light is a practical way to solve the energy crisis. However, limited by the fast recombination of photogenerated electrons and holes in photocatalysts, photocatalytic efficiency is still low. Herein, a WO 3 /BiOBr S-scheme heterojunction was formed by combining WO 3 with BiOBr, which facilitated the transfer and separation of photoinduced electrons and holes and enhanced the photocatalytic CO 2 reaction. The optimized WO 3 /BiOBr heterostructures exhibited best activity for photocatalytic CO 2 reduction without any sacrificial reagents, and the CO yield reached 17.14 μmol g -1 after reaction for 4 h, which was 1.56 times greater than that of BiOBr. The photocatalytic stability of WO 3 /BiOBr was also improved.