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Abstract:
Enhancing the stability and suppressing charge recombination in perovskite quantum dots in aqueous environment is a prerequisite for practical application in artificial photosynthesis. In this study, we confine CH3NH3PbBr3 (MAPs) perovskite nanocubes in the porous of zeolitic imidazole framework via a sequential trapping and growth activation strategy, resulting in composite photocatalyst for CO2 reduction to methane. The MAPs were in proximity with Co catalytic site in the ZIF, which facilitate rapid transfer of photogenerated electron from the MAPs to Co site with corresponding enhancement in photocatalytic CO2 reduction. The hybrid MAPs@ZIF show efficient photocatalytic CO2 reduction to Co with selectivity of 8.7% and CH4 with selectivity of 91.3%, which is far high than the photocatalytic activity for ZIF in the absence of PQDs. The DFT investigation revealed that the Co is the photocatalytic active site and the lowering of bandgap around the fermi energy level in the hybrid MAPs@ZIF compared to the individual components.