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The utilization of perovskites as photocatalysts to convert CO2 into fuels and chemicals has received wide attention recently. However, their instability in water hinders their long-term application for overall photocatalytic CO2 reduction. Herein, we integrate the water-stable perovskite-like organolead iodide crystalline material [Pb8I8(H2O)3]8+[–O2C(CH2)4CO2–]4 (TJU-16) with Au co-catalyst for photocatalytic CO2 reduction in aqueous solution without sacrificial reagent. Under the AM 1.5 G simulated illumination, the TJU-16 with 0.19 wt.‰ Au co-catalyst steadily generated electrons for CO2 reduction reaction, which was 2.2 times of pure TJU-16. The Au0.19/TJU-16 catalyzed CO2 reduction at a rate of 84.2 μmol·g−1·h−1, and achieved a solar-to-fuel (STF) conversion efficiency of 0.034%. Our work will motivate the rational design of water-stable perovskite-like materials for photocatalytic applications.
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