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Unveiling the charge transfer dynamics steered by built-in electric fields in BiOBr photocatalysts

Author

Listed:
  • Zhishan Luo

    (Fuzhou University
    Fuzhou University)

  • Xiaoyuan Ye

    (Fuzhou University)

  • Shijia Zhang

    (Fuzhou University)

  • Sikang Xue

    (Fuzhou University)

  • Can Yang

    (Fuzhou University)

  • Yidong Hou

    (Fuzhou University)

  • Wandong Xing

    (Tsinghua University)

  • Rong Yu

    (Tsinghua University)

  • Jie Sun

    (Fuzhou University)

  • Zhiyang Yu

    (Fuzhou University)

  • Xinchen Wang

    (Fuzhou University)

Abstract

Construction of internal electric fields (IEFs) is crucial to realize efficient charge separation for charge-induced redox reactions, such as water splitting and CO2 reduction. However, a quantitative understanding of the charge transfer dynamics modulated by IEFs remains elusive. Here, electron microscopy study unveils that the non-equilibrium photo-excited electrons are collectively steered by two contiguous IEFs within binary (001)/(200) facet junctions of BiOBr platelets, and they exhibit characteristic Gaussian distribution profiles on reduction facets by using metal co-catalysts as probes. An analytical model justifies the Gaussian curve and allows us to measure the diffusion length and drift distance of electrons. The charge separation efficiency, as well as photocatalytic performances, are maximized when the platelet size is about twice the drift distance, either by tailoring particle dimensions or tuning IEF-dependent drift distances. The work offers great flexibility for precisely constructing high-performance particulate photocatalysts by understanding charge transfer dynamics.

Suggested Citation

  • Zhishan Luo & Xiaoyuan Ye & Shijia Zhang & Sikang Xue & Can Yang & Yidong Hou & Wandong Xing & Rong Yu & Jie Sun & Zhiyang Yu & Xinchen Wang, 2022. "Unveiling the charge transfer dynamics steered by built-in electric fields in BiOBr photocatalysts," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-29825-0
    DOI: 10.1038/s41467-022-29825-0
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    References listed on IDEAS

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    3. Rengui Li & Fuxiang Zhang & Donge Wang & Jingxiu Yang & Mingrun Li & Jian Zhu & Xin Zhou & Hongxian Han & Can Li, 2013. "Spatial separation of photogenerated electrons and holes among {010} and {110} crystal facets of BiVO4," Nature Communications, Nature, vol. 4(1), pages 1-7, June.
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