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Research Article

Surface defect and lattice engineering of Bi5O7Br ultrathin nanosheets for efficient photocatalysis

Yunjing Wang, Hongchen He, Yunjiang Wang, Meili Xie, Feng Jing, Xianhong Yin, Feilong Hu( ), Yan Mi( )
Key Laboratory of Chemistry and Engineering of Forest Products, State Ethnic Affairs Commission, Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, Guangxi Collaborative Innovation Center for Chemistry and Engineering of Forest Products, Guangxi Minzu University, Nanning 530006, China
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Graphical Abstract

The simultaneous separation of bulk and surface photocharges is conducted to enhance photocatalytic activity by coupling the surface defects and lattice engineering of bismuth oxybromide. As that, the oxygen vacancy (OV)-assembled Bi5O7Br nanosheets leading to a notable enhancement of internal electric field (IEF) and optimizing generation of active oxygen species, both of them improved its photocatalytic degradation and mineralization efficiency.

Abstract

The effective separation and migration of photogenerated charge carriers in bulk and on the surface of photocatalysts will significantly promote photocatalytic efficiency. However, the synchronous regulation of photocharges on both counts is challenging. Herein, the simultaneous separation of bulk and surface photocharges is conducted to enhance photocatalytic activity by coupling the surface defects and lattice engineering of bismuth oxybromide. The depth-modulated Bi5O7Br ultrathin nanosheets with an abundance of bismuth in the crystal structure increased the internal electric field, which propelled the separation and migration of photocharges from bulk to the surface. Creation of oxygen vacancies (OVs) on the nanosheet surface forms local electric fields, which can stimulate the migration of charges to active sites on the catalyst surface. Therefore, the OV-assembled Bi5O7Br nanosheets demonstrated enhanced photocatalytic degradation efficiency under simulated solar-light illumination. This study proved the possibility of charge governing via electric field modulation based on an integrated strategy.

Keywords

lattice engineeringinternal electric fieldoxygen vacanciesphotocharge separationbismuth oxybromide

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Nano Research
Volume 16 Issue 1,
January 2023
Pages 248-255
DOI: 10.1007/s12274-022-4748-x
Cite this article:
Wang Y, He H, Wang Y, et al. Surface defect and lattice engineering of Bi5O7Br ultrathin nanosheets for efficient photocatalysis. Nano Research, 2023, 16(1): 248-255. https://doi.org/10.1007/s12274-022-4748-x
Topics:
Photocatalysts

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Received: 10 June 2022
Revised: 06 July 2022
Accepted: 07 July 2022
Published: 19 August 2022
© Tsinghua University Press 2022
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