Abstract
Heterojunction engineering is recognized as a promising strategy to modulate the photocatalytic prop-erties of semiconductors.Herein,lead-free Cs2CuBr4 perovskite quantum dots(PQDs)were confined in a mesoporous CuO framework and a p-n type S-scheme heterojunction of Cs2CuBr4/CuO(CCB/CuO)photocatalyst was fabricated.Experimental characterizations confirmed the effective confinement of the Cs2CuBr4 PQDs in the mesoporous CuO framework,which enabled intimate contact in the interface of CCB/CuO heterojunction,thus facilitating the interfacial charge migration and separation between p-type CuO and n-type Cs2CuBr4.Owing to the outstanding charge transport property and CO2 adsorption capac-ity,the developed CCB/CuO heterojunction exhibited remarkably enhanced photocatalytic CO2 conversion efficiency with an electron consumption rate(Relectron)of 281.1 μmol g-1 h-1,which was approximately 2.8 times higher than that of pristine Cs2CuBr4.These findings provide some insights into the rational engineering design of lead-free perovskite-based heterostructures for efficient photocatalytic CO2 conver-sion.
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