Photocatalytic CO2 reduction is a promising long-term solution to CO2 utilization by using the renewable solar energy. A number of molecular catalysts, including tricarbonyl Re complexes and cobalt tetraaza-macrocyclic compounds, are capable for mediating multielectron CO2 reduction. However, these molecular catalysts are usually not stable enough to achieve high turnover numbers. Hybrid photocatalysts, particularly those prepared by covalently attaching molecular catalysts onto solid-state surfaces, are efficient and robust systems for solar CO2 production. Here, we introduce our recent work to prepare hybrid photocatalysts by immobilizing molecular complexes on silica surfaces.
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