Construction of a ternary WO3/CsPbBr3/ZIF-67 heterostructure for enhanced photocatalytic carbon dioxide reduction

Using halide perovskite nanomaterials for solar-to-fuel conversion has recently attracted a lot of attention due to their excellent photoelectric properties. However, severe photogenerated charge carrier recombinations and poor reaction kinetics greatly restrict their photocatalytic performance. In this study, a ternary WO3/CsPbBr3/ZIF-67 heterostructure was designed for efficient CO2 photoreduction. The results indicate that the Z-scheme charge transfer pathway constructed between WO3 and CsPbBr3 ensures the effective transfer and separation of photogenerated charge carriers. Meanwhile, the subsequent surface modification of zeolitic imidazolate frameworks (ZIF-67) with active Co centers further benefits CO2 adsorption and activation. Accordingly, the synergistic effects of charge separation and CO2 uptake greatly promote the photocatalytic activity. The optimal WO3/CsPbBr3/ZIF-67 heterostructure yields a CO production of 99.38 μmol g−1 in 3 h, which is 6.8 times of that produced by CsPbBr3. This work will inspire new insights in developing efficient photocatalysts for CO2 reduction and even more challenging photocatalytic reactions by elaborately regulating the functional ingredient.