Abstract
Photocatalytic cycloadditions of CO2 with epoxides are emerging as a significant platform for the green synthesis of valuable carbonates, where efficient catalytic systems with spatially separated charge carriers are demanded. Herein, a single p-block metal atom is proposed to be a candidate for photogenerated electron localization on a metal oxide substrate. By taking the Bi single-atom supported on ZnO nanosheet (Bi1/ZnO) as an example, we show that the Bi atom plays the role of an electron island in the sea of delocalized holes within ZnO. Meanwhile, the as-formed electron island could readily promote the rate-determining ring-opening process of cycloaddition reactions. Benefiting from the unique spatially separated electrons and holes, the Bi1/ZnO achieves a high yield of cyclic carbonates with almost 100% selectivity. This study provides a pioneering strategy for enhancing the performances of photocatalytic CO2 chemical fixation.
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Acknowledgements
This work was supported by the National Key R&D Program of China (2022YFA1502903, 2021YFA1501502), the Strategic Priority Research Program of Chinese Academy of Sciences (XDB0450000, XDB36000000), the National Natural Science Foundation of China (92163105, T2122004, U2032212, 22275179, 22305058), the Anhui Provincial Key Research and Development Program (2022a05020054), the Fundamental Research Funds for the Central Universities (WK2060000039, WK2060000068), the China Postdoctoral Science Foundation (2023TQ0341, 2023M743369), and the Postdoctoral Fellowship Program of CPSF (GZB20230706). The numerical calculations in this paper have been done on the supercomputing system in the Supercomputing Center of the University of Science and Technology of China. We also thank the Infrared Spectroscopy and Microspectroscopy Endstation (BL01B), the Catalysis and Surface Science Endstation (BL11U) at the National Synchrotron Radiation Laboratory (NSRL) and the beamline 1W1B station in the Bei**g Synchrotron Radiation Facility (BSRF) for help in characterizations. This work was partially carried out at the Instruments Center for Physical Science, University of Science and Technology of China.
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Shang, S., Li, L., He, X. et al. Single-atom-mediated electron islands boost photocatalytic CO2 chemical fixation. Sci. China Chem. (2024). https://doi.org/10.1007/s11426-024-1970-5
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DOI: https://doi.org/10.1007/s11426-024-1970-5