Highly selective photoreduction of CO2 catalyzed by the encapsulated heterometallic-substituted polyoxometalate into a photo-responsive metal-organic framework

The highly selective photoreduction of CO2 into valuable chemical fuels such as CO has been consid-ered as an effective strategy to address modern energy and environmental issues. In this work, we have adopted the well-established impregnation approach to construct a P2W15Ni3{Re(CO)313 @NU-1000 composite by incorporating heterometallic-substituted P2W15Ni3{Re(CO)313 polyoxo-metalate (POM) into the pores of metal-organic framework (NU-1000) host. Upon light irradiation, the resulting P2W15Ni3{Re(CO)313@NU-1000 composite can effectively photocatalyze CO2 reduction, obtaining a CO production of 28982 mu mol g-1 with 93.5% selectivity during 10-h photocatalysis. The catalytic system exhibits great long-term recyclability and stability for at least four successive recy-cles. The proposed photocatalytic mechanism was confirmed by a series of photochemical and spectroscopic analyses. (c) 2023, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.

Automated summary

A P2W15Ni3{Re(CO)313@NU-1000 composite was developed through impregnation to serve as an efficient catalyst for photoreduction of CO2. Under light irradiation, the composite demonstrated high selectivity and produced a significant amount of CO with a yield of 28982 μmol g-1 and selectivity of 93.5%. The composite also showed excellent recyclability and stability over multiple cycles.