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Enhanced photocatalytic activity of Z-scheme CeO2/CexBi2−xWO6 heterojunction induced by Ce doping and build-in electric field

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Abstract

CeO2/CexBi2−xWO6 heterojunction was synthesized by the one-step microwave hydrothermal method. Compared with the pure Bi2WO6, the light response range of CeO2/CexBi2−xWO6 was obviously broadened due to the formation of the interface heterojunction. Moreover, the higher concentration of oxygen vacancies was introduced into CeO2/CexBi2−xWO6 induced by Ce doping. Due to the synergistic effect of the heterojunction and oxygen vacancies, the prepared heterojunction showed the significantly improved separation efficiency and migration rate of the photogenerated electron–hole pairs. The build-in electric field from CeO2 to CexBi2−xWO6 was constructed induced by the polarization charge transfer, resulting in the transition from II-type heterojunction to Z-scheme structure, and the stronger redox ability of the photoinduced carriers. Hence, the prepared CeO2/CexBi2−xWO6 heterojunction exhibited enhanced photocatalytic activity for organic pollutants degradation. This work provided a feasible strategy for the preparation of heterojunction photocatalysts with high visible light activity.

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Acknowledgements

This work is supported by the Project of the National Natural Science Foundation of China (Grant Nos. 52172215 and 51772180), the Shaanxi Province Key Research and Development Plan (2018GY-107), and the Graduate Innovation Fund of Shaanxi University of Science and Technology (SUST-A04). In addition, the linguistic services of this work is provided by EditSprings.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shaanxi University of Science & Technology, Xi’an, 710021, Shaanxi, China

    Wei Yang, Min Wang & Chi Xu

  2. AVIC Qing An Croup Co., LTD., Xi’an, 710077, Shaanxi, China

    Wei Yang

  3. China Academy of Space Technology, Xi’an, 710100, Shaanxi, China

    Shaohua Dong

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  1. Wei Yang
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  2. Min Wang
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Correspondence to Min Wang.

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Yang, W., Wang, M., Xu, C. et al. Enhanced photocatalytic activity of Z-scheme CeO2/CexBi2−xWO6 heterojunction induced by Ce doping and build-in electric field. J Mater Sci: Mater Electron 33, 5049–5060 (2022). https://doi.org/10.1007/s10854-022-07693-0

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  • DOI: https://doi.org/10.1007/s10854-022-07693-0

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