Defect in reduced graphene oxide tailored selectivity of photocatalytic CO2 reduction on Cs4PbBr6 pervoskite hole-in-microdisk structure

Abstract

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 4 PbBr 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 4 PbBr 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. Taking advantage of all-inorganic perovskite (Cs 4 PbBr 6 ) and residual oxygen defects in reduced graphene oxide, high efficiency, selectivity and durability of CO 2 reduction capacity to CO is successfully achieved. • Cs 4 PbBr 6 perovskite with hole-in-microdisk (HIMD) structure hybridized with reduced graphene oxide is synthesized. • HIMD Cs 4 PbBr 6 /rGO acts as an effective photocatalyst for CO 2 photoreduction. • Defects in rGO sheets are demonstrated for improving the activity and selectivity of CO 2 photoreduction.