Defect in reduced graphene oxide tailored selectivity of photocatalytic CO_2 reduction on Cs_4PbBr_6 pervoskite hole-in-microdisk structure

摘要

Artificial photocatalytic conversion of CO_2 into value-added and renewable fuels has been recognized as a promising approach for solving environmental problems and energy crisis.Achieving this goal,developing a photocatalyst to simultaneously manifest high efficiency,selectivity,and durability is urgent need.Herein,one of all-inorganic cesium lead halide perovskite (viz.Cs_4PbBr_6) with hole-in-microdisk structure hybridized with reduced graphene oxide (rGO) is reported as an effective photocatalyst for reducing of CO_2.Our results show that Cs_4PbBr_6/rGO exhibited high efficiency,selectivity,and durability of CO_2 reduction capacity to CO,catalyzing at a rate of 11.4 μmol g~(-1)h~(-1) with a maintaining stability of 60 h.Residual oxygen impurities as defects in the rGO sheets are demonstrated for facilitating CO_2 activation and reduction capacity to CO.This finding provides a facile pathway for designing high performance perovskite photocatalyst with high selectivity and durability with the aid of defects engineering.