2D/2D heterostructure of ultrathin BiVO4/Ti3C2 nanosheets for photocatalytic overall Water splitting

The BiVO4 ultrathin nanosheet is found to disintegrate pure water into H2 and O2 simultaneously under simulated solar light irradiation beacause of the quantum size effect. Further, the unique 2D/2D heterostrucutre of BiVO4/Ti3C2 displays remarkably enhanced performance towards photocatalytic overal...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2021-05, Vol.285, p.119855, Article 119855
Main Authors: Li, Yujie, Liu, Yuanyuan, Xing, Danning, Wang, Jiajia, Zheng, Liren, Wang, Zeyan, Wang, Peng, Zheng, Zhaoke, Cheng, Hefeng, Dai, Ying, Huang, Baibiao
Format: Article
Language:English
Subjects:
2D/2D heterostructure
Bismuth oxides
BiVO4ultrathin nanosheets
Charge transport
Electrostatic properties
Heterojunctions
Heterostructures
Hydrogen-based energy
Irradiation
Light irradiation
Nanosheets
Overall water splitting
Photocatalysis
Radiation
Reagents
Solar energy
Solar energy conversion
Splitting
Ti3C2nanosheets
Vanadates
Water splitting
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Summary:The BiVO4 ultrathin nanosheet is found to disintegrate pure water into H2 and O2 simultaneously under simulated solar light irradiation beacause of the quantum size effect. Further, the unique 2D/2D heterostrucutre of BiVO4/Ti3C2 displays remarkably enhanced performance towards photocatalytic overall water splitting, about 4 times H2 and O2 evolution rate of that over pure BiVO4 nanosheets. [Display omitted] •Photocatalytic H2 evolution and overall water splitting over BiVO4 ultrathin nanosheets is realized.•2D/2D BiVO4/Ti3C2 composites are successfully synthesized through electrostatic interaction.•The construction of 2D/2D heterojunction provides an alternative way to improve the photocatalytic activity.•The catalytic mechanism of electron-hole separation and migration is proposed. Photocatalytic overall water splitting is a promising environmental friendly technique to convert solar energy into hydrogen (H2) and oxygen (O2). Here, BiVO4 ultrathin nanosheets is found to disintegrate pure water into H2 and O2 simultaneously under simulated solar light irradiation without sacrificial reagents. And a novel 2D/2D BiVO4/Ti3C2 composites is successfully synthesized through electrostatic interaction between BiVO4 and Ti3C2 nanosheets. Because the unique 2D/2D heterojunction possesses large interface contact area and quite short charge transport distance, BiVO4/Ti3C2 displays much higher photoexcited carrier transfer and separation efficiency and ultimately exhibits remarkable photocatalytic overall water splitting activity. This work may provide the first experimental confirmation of ultrathin BiVO4 nanosheets with an ability of photocatalytic overall water splitting, and the 2D/2D combination between BiVO4 and Ti3C2 is an effective way for further improving the activity, which may provide guidance for designing efficient water splitting photocatalysts in the future.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2020.119855