Preparation of Z-scheme BiVO4−x/g-C3N4−x heterojunction mediated by double defects and photocatalytic overall water splitting

YANG Yurong; WANG Jiahui; MA Yuanchi; QIU Min; YAN Guomin; LIU Yufei

doi:10.13801/j.cnki.fhclxb.20210927.003

Volume 39 Issue 10

Aug. 2022

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YANG Yurong, WANG Jiahui, MA Yuanchi, et al. Preparation of Z-scheme BiVO4−x/g-C3N4−x heterojunction mediated by double defects and photocatalytic overall water splitting[J]. Acta Materiae Compositae Sinica, 2022, 39(10): 4642-4651. doi: 10.13801/j.cnki.fhclxb.20210927.003

Citation:

YANG Yurong, WANG Jiahui, MA Yuanchi, et al. Preparation of Z-scheme BiVO_4−x/g-C₃N_4−x heterojunction mediated by double defects and photocatalytic overall water splitting[J]. Acta Materiae Compositae Sinica, 2022, 39(10): 4642-4651. doi: 10.13801/j.cnki.fhclxb.20210927.003

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Preparation of Z-scheme BiVO_4−x/g-C₃N_4−x heterojunction mediated by double defects and photocatalytic overall water splitting

doi: 10.13801/j.cnki.fhclxb.20210927.003

1.
College of Science, Heihe University, Heihe 164300, China
2.
Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China

Received Date: 2021-08-09
Accepted Date: 2021-09-13
Rev Recd Date: 2021-09-02

Available Online: 2021-09-28

Publish Date: 2022-08-22

Abstract

Abstract

Z-scheme BiVO_4−x/g-C₃N_4−x heterostructure mediated by double defects were prepared by solid phase sintering and hydrothermal methods to acquire an efficient photocatalytic system for full water splitting. The microstructure and optoelectronic properties of the heterostructure were characterized, and the photocatalytic properties of BiVO_4−x/g-C₃N_4−x heterostructure for hydrogen and oxygen production by overall photocatalytic water splitting were tested. The results show that the introduction of abundant oxygen vacancy and nitrogen vacancy, the tightly connected interface and the construction of direct Z-scheme heterojunction improve the visible light absorption and accelerate the separation and transfer of photogenerated charge. As a result, the material has highly efficient photocatalytic activity. The Z-scheme BiVO_4−x/g-C₃N_4−x heterojunction mediated by double defects show excellent photocatalytic activity and stability. Under visible light irradiation, the hydrogen and oxygen evolution rate reach 654 μmol·h⁻¹·g⁻¹, which is 6.5 times as high as that of g-C₃N_4−x precursor, and the oxygen evolution rate reach 302 μmol·h⁻¹·g⁻¹. After 20 h of visible light irradiation, the photocatalytic activity of the sample doesn’t decrease.
- double defects,
- BiVO₄,
- g-C₃N₄,
- Z-scheme heterostructure,
- photocatalytic overall water splitting
Long Abstrsct
Innovation Points

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References(24)

References

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