Abstract
Quantum dots exhibit great potential in photocatalytic CO2 conversion into value-added fuels to achieve a carbon-neutral society, owing to their unique optical properties and tunable surface chemistry. However, the generation of multi-carbon hydrocarbon products remains a grand challenge. Herein, polyethyleneimine (PEI) coated AgInS2 quantum dots (AgInS2@PEI QDs) are designed for the photo-catalytic conversion of CO2 to C2 products. It is found that the yield and selectivity of C2H6 can be significantly enhanced by regulating the content of Ag and PEI in AgInS2@PEI QDs. Under the optimal conditions, C2H6 yield reaches 63 μmol g-1, and the electron selectivity is 30.3 %. A mechanistic study reveals that PEI effectively promotes the accumulation of photogenerated electrons, and the CO-enriched local environment caused by Ag boosts CC coupling on asymmetric bimetallic sites. This work offers new insight on the design of efficient quantum dot photocatalysts for CO2 conversion to C2 products.
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