The proper energy band structure and excellent visible-light responses enable halide perovskites as potential photocatalysts for CO 2 reduction, but the conversion efficiency is still low due to the serious radiative recombination, low CO 2 capturing ability, and poor stability. Here we illustrate the design and synthesis of a halide perovskite@metal−organic framework (MOF) composite photocatalyst with enhanced CO 2 reduction activity. A facile in situ synthetic procedure is employed to directly grow a zinc/cobalt-based zeolitic imidazolate framework (ZIF) coating on the surface of CsPbBr 3 quantum dots. The CsPbBr 3 @ZIF composite shows largely improved moisture stability, CO 2 capturing ability, and charge separation efficiency. Moreover, the catalytic active Co centers in ZIF-67 can further accelerate the charge separation process and activate the adsorbed CO 2 molecules, which leads to enhanced catalytic activity for gaseous CO 2 reduction. This work would provide new insight for designing excellent perovskite/MOF-based catalysts.
The excellent photoelectrical properties have rendered lead halide perovskites potential candidates for photocatalytic CO2 reduction, but they still suffer from the low charge separation efficiency and slow catalytic reaction dynamics. To tackle these drawbacks, herein, a novel CsPbBr3‐Re(CO)3Br(dcbpy) (dcbpy=4,4’‐dicarboxy‐2,2’‐bipyridine) composite photocatalyst is elaborately designed and fabricated by anchoring the complex molecules onto the surface of CsPbBr3 nanocrystal to work as co‐catalyst. Owing to the robust interfacial interaction, effective electron extraction from CsPbBr3 to complex molecules can be established, which enables the mutual synergetic action to get boosted visible‐light‐driven catalytic activity and product selectivity. As an encouraging result, a high electron consumption rate of 73.34 μmol g−1 h−1 is yielded for the optimized CsPbBr3‐Re(600) sample, which is about 23‐fold of that of pristine CsPbBr3. In addition, a praiseworthy CO selectivity of up to 95% is obtained. The composite catalyst also exhibits good catalytic stability, and a CO yield of 509.14 μmol g−1 is achieved after 15 h of continuous illumination. This result may provide a new strategy to design efficient lead halide perovskite‐based heterogeneous photocatalysts.
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