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The visible-light-driven photoreduction of CO 2 to value-added chemicals over metal-free photocatalysts without sacrificial reagents is very interesting, but challenging. Herein, we present amide-bridged conjugated organic polymers (amide-COPs) prepared via self-condensation of amino nitriles in combination with hydrolysis, for the photoreduction of CO 2 with H 2 O without any photosensitizers or sacrificial reagents under visible light irradiation. These catalysts can afford CO as the sole carbonaceous product without H 2 generation. Especially, amide-DAMN derived from diaminomaleonitrile exhibited the highest activity for the photoreduction of CO 2 to CO with a generation rate of 20.6 μmol g -1 h -1 . Experiments and DFT calculations confirmed cyano/amide groups as active sites for CO 2 reduction and second amine groups for H 2 O oxidation, and suggested that superior selectivity towards CO may be attributed to the adjacent redox sites. This work presents a new insight into designing photocatalysts for artificial photosynthesis.

Amide-bridged conjugated organic polymers: efficient metal-free catalysts for visible-light-driven CO2 reduction with H2O to CO

Amide-bridged conjugated organic polymers: efficient metal-free catalysts for visible-light-driven CO₂ reduction with H₂O to CO