Multifunctional Mulberry‐like BiVO4−Bi2O3 p‐n Heterostructures with Enhanced both Photocatalytic Reduction and Oxidation Activities

Rationally engineered p‐n heterojunctions with the extensive heterogeneous interfaces is a promising method to pursue high charge carrier mobility and excellent photocatalytic activity in a wide range of applications. A porous mulberry‐like BiVO4−Bi2O3 composite with p‐n heterojunctions was synthesi...

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Bibliographic Details
Published in:ChemCatChem 2021-07, Vol.13 (14), p.3357-3367
Main Authors: Huang, Lei, Hou, Dongfang, Gan, Shenglong, Qiao, Xiu‐qing, Li, Dong‐sheng
Format: Article
Language:English
Subjects:
Bismuth oxides
Bismuth trioxide
BiVO4−Bi2O3
Carbon dioxide
Carrier mobility
Catalytic activity
CO2 and Cr(VI) reduction
Current carriers
Heterojunctions
Heterostructures
Light irradiation
NO removal
Oxidation
p-n Heterostructures
Photocatalysis
Reduction
Vanadates
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Summary:Rationally engineered p‐n heterojunctions with the extensive heterogeneous interfaces is a promising method to pursue high charge carrier mobility and excellent photocatalytic activity in a wide range of applications. A porous mulberry‐like BiVO4−Bi2O3 composite with p‐n heterojunctions was synthesized via a one‐pot hydrothermal approach. There exist intimate interfaces between the two semiconductors because of the in situ growth condition. The as‐obtained BiVO4−Bi2O3 heterojunctions exhibit excellent photocatalytic performance not only for CO2 and Cr(VI) reduction, but also for NO removal under visible light irradiation in contrast to pure BiVO4. The CH4 and CO yields for CO2 reduction reaches 13.16 μmol g−1 and 1.68 μmol g−1, about 47 and 25.7 times higher than that of pure BiVO4, and the highest apparent rate constant is about 56 times than that of BiVO4 in the process of Cr(VI) reduction. Further detailed characterization reveals that the enhanced and stable photocatalytic reduction and oxidation activities can be attributed to the efficient transfer and spatial separation of the photo‐induced carriers, resulting from not only p‐n heterojunctions with matched band structures, but also intimate contact and the abundant interfaces between BiVO4 and Bi2O3. Photocatalysis: The excellent photocatalytic activities for reduction of CO2 and Cr(VI), and NO removal over multifunctional mulberry‐like BiVO4−Bi2O3 with p‐n heterostructures are ascribed to the synergetic effects of the adequate interface contact and the efficient spatial separation of the charges.
ISSN:1867-3880
1867-3899
DOI:10.1002/cctc.202100422