WO₃/BiOBr S-Scheme Heterojunction Photocatalyst for Enhanced Photocatalytic CO₂ Reduction

The photocatalytic CO₂ 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 WO₃/BiOBr S-scheme heterojunction was formed by combining WO₃ with BiOBr, which facilitated the transfer and separation of photoinduced electrons and holes and enhanced the photocatalytic CO₂ reaction. The optimized WO₃/BiOBr heterostructures exhibited best activity for photocatalytic CO₂ 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 WO₃/BiOBr was also improved.