Hierarchical CsPbBr3 Nanocrystal Decorated ZnO Nanowires/Macroporous Graphene Hybrids for Enhancing Charge Separation and Photocatalytic CO2 Reduction
Solar-driven CO2 conversion for chemical fuel production has been regarded as an effective strategy to alleviate the environmental and energy issues. In this study, we construct a novel composite catalyst film in which the CsPbBr3 nanocrystals (NCs) are loaded on a hierarchical branched ZnO nanowires (BZNW)/macroporous graphene scaffold (CsPbBr3 NC/BZNW/MRGO). Such well-designed multi-dimensional architecture rationally integrates excellent visible-light absorption capability of CsPbBr3 NC, fast charge transport as well as improved CO2 capture ability afforded by the ZnO nanowire-branched macroporous graphene. By virtue of such favorable synergestic effect, a boosted photocatlaytic performance has been achieved with a photoelectron consumption rate of 52.02 μmol gcat-1 h-1 under visible light irradiation, which is 4.98 and 1.65 times higher than that of CsPbBr3 NC (10.44 μmol gcat-1 h-1) and CsPbBr3 NC/MRGO (31.52 μmol gcat-1 h-1), respectively. What’s more, a desirable CH4 selectivity up to 96.7% is achieved.