Abstract
The high exciton binding energy and lack of a positive oxidation band potential restrict the photocatalytic CO2 reduction efficiency of lead-free Bi-based halide perovskites Cs3Bi2X9 (X = Br, I). In this study, a sequential growth method is presented to prepare a visible-light-driven (λ > 420 nm) Z-scheme heterojunction photocatalyst composed of BiVO4 nanocrystals decorated on a Cs3Bi2I9 nanosheet for photocatalytic CO2 reduction coupled with water oxidation. The Cs3Bi2I9/BiVO4 Z-scheme heterojunction photocatalyst is stable in the gas–solid photocatalytic CO2 reduction system, demonstrating a high visible-light-driven photocatalytic CO2-to-CO production rate of 17.5 μmol/(g·h), which is approximately three times that of pristine Cs3Bi2I9. The high efficiency of the Cs3Bi2I9/BiVO4 heterojunction was attributed to the improved charge separation in Cs3Bi2I9. Moreover, the Z-scheme charge-transfer pathway preserves the negative reduction potential of Cs3Bi2I9 and the positive oxidation potential of BiVO4. This study offers solid evidence of constructing Z-scheme heterojunctions to improve the photocatalytic performance of lead-free halide perovskites and would inspire more ideas for developing lead-free halide perovskite photocatalysts.
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Acknowledgements
The authors gratefully acknowledge the financial support from the National Key R&D Plan Project (No. 2022YFA1505000), Prospective Basic Research Projects of CNPC (Nos. 2021DQ03(2022Z-29), 2022DJ5406, 2022DJ5407, 2022DJ5408, 2022DJ4507, and TGRI-2021-1), the Natural Science Foundation of Shaanxi Province (No. 2022JQ-078), the Natural Science Foundation of China (No. 52302308), the Outstanding Youth Science Foundation Project of the National Natural Science Foundation of China (Overseas) (No. GYKP033) and the Qinchuangyuan Cited High-Level Innovative and Entrepreneurial Talents Project (No. QCYRCXM-2022-143).
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Jiang, L., Du, H., Li, L. et al. Sequential Growth of Cs3Bi2I9/BiVO4 Direct Z-Scheme Heterojunction for Visible-Light-Driven Photocatalytic CO2 Reduction. Trans. Tianjin Univ. 29, 462–472 (2023). https://doi.org/10.1007/s12209-023-00376-9
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DOI: https://doi.org/10.1007/s12209-023-00376-9