Anion-exchange-mediated internal electric field for boosting photogenerated carrier separation and utilization

Tong Han, Xing Cao, Kaian Sun, Qing Peng (), Chenliang Ye, Aijian Huang, Weng-Chon Cheong, Zheng Chen, Rui Lin, Di Zhao, Xin Tan, Zewen Zhuang, Chen Chen (), Dingsheng Wang and Yadong Li ()
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Tong Han: Tsinghua University
Xing Cao: Tsinghua University
Kaian Sun: Tsinghua University
Qing Peng: Tsinghua University
Chenliang Ye: Tsinghua University
Aijian Huang: Tsinghua University
Weng-Chon Cheong: Faculty of Science and Technology, University of Macau
Zheng Chen: Anhui Normal University
Rui Lin: Ludwig-Maximilians-Universität München
Di Zhao: School of Chemistry and Chemical Engineering, Beijing Institute of Technology
Xin Tan: Tsinghua University
Zewen Zhuang: Tsinghua University
Chen Chen: Tsinghua University
Dingsheng Wang: Tsinghua University
Yadong Li: Tsinghua University

Nature Communications, 2021, vol. 12, issue 1, 1-11

Abstract: Abstract Heterojunctions modulated internal electric field (IEF) usually result in suboptimal efficiencies in carrier separation and utilization because of the narrow IEF distribution and long migration paths of photocarriers. In this work, we report distinctive bismuth oxyhydroxide compound nanorods (denoted as BOH NRs) featuring surface-exposed open channels and a simple chemical composition; by simply modifying the bulk anion layers to overcome the limitations of heterojunctions, the bulk IEF could be readily modulated. Benefiting from the unique crystal structure and the localization of valence electrons, the bulk IEF intensity increases with the atomic number of introduced halide anions. Therefore, A low exchange ratio (~10%) with halide anions (I–, Br–, Cl–) gives rise to a prominent elevation in carrier separation efficiency and better photocatalytic performance for benzylamine coupling oxidation. Here, our work offers new insights into the design and optimization of semiconductor photocatalysts.

Date: 2021
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DOI: 10.1038/s41467-021-25261-8

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