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Title: Bismuth vacancy mediated single unit cell Bi2WO6 nanosheets for boosting photocatalytic oxygen evolution
Authors: Di, Jun
Chen, Chao
Zhu, Chao
Ji, Mengxia
Xia, Jiexiang
Yan, Cheng
Hao, Wei
Li, Shuzhou
Li, Huaming
Liu, Zheng
Keywords: Engineering::Materials
Issue Date: 2018
Source: Di, J., Chen, C., Zhu, C., Ji, M., Xia, J., Yan, C., . . . Liu, Z. (2018). Bismuth vacancy mediated single unit cell Bi2WO6 nanosheets for boosting photocatalytic oxygen evolution. Applied Catalysis B: Environmental, 238, 119-125. doi:10.1016/j.apcatb.2018.06.066
Journal: Applied Catalysis B: Environmental
Abstract: Surface defects are critically important for photocatalytic reactions. Compared with the widely studied oxygen vacancies, engineering metal vacancies into photocatalysts and study the effect of metal vacancies on the photocatalytic performance is seldom reported. Herein, we engineering bismuth vacancies into Bi2WO6 via a template-directed strategy to form single unit cell ultrathin nanosheets. Aberration-corrected scanning transmission electron microscopy reveals the formation of bismuth vacancies in the Bi2WO6 ultrathin nanosheets. Density functional theory calculations suggest that the presence of bismuth vacancies create a new defect level in forbidden band and increased density of states at the valence band maximum, resulting in increased charge carrier concentration and electronic conductivity. Moreover, the bismuth vacancy structure benefit for the surface adsorption and activation of water molecule, which favors the water oxidation reactions. As a result, the prepared bismuth vacancy-rich Bi2WO6 exhibit significantly increased visible light photocatalytic oxygen evolution activity than the corresponding bulk Bi2WO6, which is the more challenging half-reaction for fuel-forming due to the sluggish reaction kinetics. This work open the door for designing other metal vacancies engineered photocatalysts via ultrathin-control strategy and achieving highly efficient photocatalytic performances.
ISSN: 0926-3373
DOI: 10.1016/j.apcatb.2018.06.066
Rights: © 2018 Elsevier B.V. All rights reserved. This paper was published in Applied Catalysis B: Environmental and is made available with permission of Elsevier B.V.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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