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S-Doped Oriented Construction of {001} Facets Exposed BiOBr Nanosheets with Abundant Oxygen Vacancies and Promoted Visible-Light-Driven Photocatalytic Performance

Abstract

Element doping and crystal engineering are efficient strategies to enhance the photo-reactivity of semiconductors by tuning the physico-chemical properties. Herein, S-doped BiOBr photocatalysts with tunable exposed {001} facets, were prepared by a hydrothermal method and characterized by XRD, XRF, BET, FT-IR, SEM, TEM, EDS, XPS, UV-vis DRS and EIS. It reveals S doping could orient the facet growth of BiOBr nanosheets from original exposed {010} plane towards {001}-dominant plane. The thiourea is selected as a “three-in-one” reaction media, which not only acts as a kind of ligand, capping agent and S donator, but also plays a crucial role on the oriented growth of exposed {001} facet BiOBr nanosheets. The photocatalytic activity of the obtained hybrids is evaluated by oxidizing RhB under visible light irradiation. S-doped BiOBr catalysts show significant improvement of photocatalytic activity compared with original BiOBr, which is attributed to the synergistic effect of S doping and {001} dominant facet growth, resulting in narrower bandgap energy, higher efficient charges separation and oxygen vacancies (OVs) concentration. This study provides a paradigm of crystal facet control by element doping, and gives a deep insight into the specific surface and properties determined doping element and crystal facet engineering.

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Article information


Submitted
13 Aug 2020
Accepted
23 Sep 2020
First published
24 Sep 2020

CrystEngComm, 2020, Accepted Manuscript
Article type
Paper

S-Doped Oriented Construction of {001} Facets Exposed BiOBr Nanosheets with Abundant Oxygen Vacancies and Promoted Visible-Light-Driven Photocatalytic Performance

M. Huang, J. Li, W. Su, X. Huang , B. Li, M. Fan, L. Dong and H. He, CrystEngComm, 2020, Accepted Manuscript , DOI: 10.1039/D0CE01187H

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