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Significant efforts have been devoted to develop efficient visible-light-driven photocatalysts for the conversion of CO 2  to chemical fuels. The photocatalytic efficiency for this transformation largely depends on CO 2  adsorption and diffusion. However, the CO 2  adsorption on the surface of photocatalysts is generally low due to their low specific surface area and the lack of matched pores. Here we report a well-defined porous hypercrosslinked polymer-TiO 2 -graphene composite structure with relatively high surface area i.e., 988 m 2  g −1  and CO 2  uptake capacity i.e., 12.87 wt%. This composite shows high photocatalytic performance especially for CH 4  production, i.e., 27.62 μmol g −1  h −1 , under mild reaction conditions without the use of sacrificial reagents or precious metal co-catalysts. The enhanced CO 2  reactivity can be ascribed to their improved CO 2  adsorption and diffusion, visible-light absorption, and photo-generated charge separation efficiency. This strategy provides new insights into the combination of microporous organic polymers with photocatalysts for solar-to-fuel conversion.

Porous hypercrosslinked polymer-TiO2-graphene composite photocatalysts for visible-light-driven CO2 conversion