Citation: Decai Yang, Yachao Xu, Kai Pan, Chuanxin Yu, Jiaxing Wu, Mingxia Li, Fan Yang, Yang Qu, Wei Zhou. Engineering surface oxygen vacancy of mesoporous CeO₂ nanosheets assembled microspheres for boosting solar-driven photocatalytic performance[J]. Chinese Chemical Letters, ;2022, 33(1): 378-384. doi: 10.1016/j.cclet.2021.06.035 shu

Engineering surface oxygen vacancy of mesoporous CeO₂ nanosheets assembled microspheres for boosting solar-driven photocatalytic performance

Decai Yang ^a ,
Yachao Xu ^a ,
Kai Pan ^{a, *,} ,
Chuanxin Yu ^a ,
Jiaxing Wu ^a ,
Mingxia Li ^{a, *,} ,
Fan Yang ^a ,
Yang Qu ^a ,
Wei Zhou ^{a, b, *,}

a.
School of Chemistry and Materials Science, Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin 150080, China
b.
Shandong Provincial Key Laboratory of Molecular Engineering, School of Chemistry and Chemical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Ji'nan 250353, China

kaipan@hlju.edu.cn

limingxia@hlju.edu.cn

wzhou@qlu.edu.cn

Received Date: 2 June 2021
Revised Date: 10 June 2021
Accepted Date: 15 June 2021
Available Online: 25 June 2021

Figures(7)

Surface oxygen vacancy defects of mesoporous CeO₂ nanosheets assembled microspheres (D-CeO₂) are engineered by polymer precipitation, hydrothermal and surface hydrogenation strategies. The resultant D-CeO₂ with a main pore diameter of 9.3 nm has a large specific surface area (~102.3 m²/g) and high thermal stability. The mesoporous nanosheets assembled microsphere structure prevents the nanosheets from aggregation, which is beneficial to effective mass transfer and shortens the migration distance of charge carriers. After surface hydrogenation, the photoresponse extends to long wavelength region, combing with the band gap from 2.63 eV reduced to 2.39 eV. Under AM 1.5 G radiation, the photocatalytic degradation rate of tetracycline (TC) can be up to 99.99%, which is three times as high as that of pristine CeO₂ microspheres. The excellent solar-driven photocatalytic performance can be attributed to the efficient surface oxygen vacancy engineering and the mesoporous nanosheets assembled microsphere structure, which narrows the band gap, shortens the migration distance of carriers, promotes the spatial separation of photogenerated electron-hole pairs and favors mass transfer. The strategy provides new insights for fabricating other high-efficient oxide photocatalysts.
- Mesoporous CeO₂,
- Photocatalysis,
- Nanosheet,
- Surface oxygen vacancy,
- Surface defect
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Engineering surface oxygen vacancy of mesoporous CeO2 nanosheets assembled microspheres for boosting solar-driven photocatalytic performance

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通讯作者: 陈斌, bchen63@163.com

Engineering surface oxygen vacancy of mesoporous CeO₂ nanosheets assembled microspheres for boosting solar-driven photocatalytic performance