Efficient visible light-driven photocatalytic CO2 reduction by self-assembled CsPbBr3 perovskite quantum dots on two-dimensional Bi2O2CO3 petals

초록

All-inorganic halide perovskites, such as CsPbBr3 (CPB), face inherent limitations in the photocatalytic reduction of CO2 due to their accelerated radiative recombination and insufficient charge carrier separation. In this work, a heterogeneous photocatalyst comprising Bi2O2CO3 (BOC) petals and CPB quantum dots (QDs) was prepared. The opposite surface potentials of the BOC and CPB QDs enabled their electrostatic self-assembly. The CPB QD/BOC exhibited staggered energy-band configurations with a built-in internal electric field, leading to electron migration from the CPB QD to the BOC petals. Owing to its unique band structure and internal electric field, the CPB QD/BOC exhibited an S-scheme-type heterojunction, resulting in fast charge separation. As a result, the CPB QD/BOC exhibited a significantly enhanced photocatalytic CO2 conversion rate to CO (80.5 mu mol g(-1) h(-1)) compared to pristine CPB QD (43 mu mol g(-1) h(-1)). This study opens new avenues for designing highly efficient photocatalysts using inorganic halide perovskites.

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