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An artificially constructed direct Z-scheme heterojunction: WO3 nanoparticle decorated ZnIn2S4 for efficient photocatalytic hydrogen production

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Abstract

Photocatalytic H2 evolution has been proven as one of the promising strategies for addressing global energy and environmental issues. Herein, a binary Z-scheme heterostructure of a WO3/ZnIn2S4 photocatalyst was artificially constructed through a simple hydrothermal method. A variety of characterization tests were employed to prove the effective coupling of WO3 nanoparticles and ZnIn2S4 particles for the fabrication of the WO3/ZnIn2S4 heterostructure. It was found that the decoration of WO3 nanoparticles could significantly promote the photocatalytic H2 evolution activity of ZnIn2S4 under visible-light irradiation, and the H2 evolution rate of 5 wt% WO3/ZnIn2S4 composite could reach 1945.88 μmol h−1 g−1, which was 7.9 times that of pristine ZnIn2S4 and could rival that of previously reported ZnIn2S4-based photocatalysts. On the basis of photoelectrochemical results, the direct Z-scheme heterojunction rather than the type-II heterojunction was proposed to explain the significantly enhanced photocatalytic performance of the WO3/ZnIn2S4 photocatalyst. The enhancement of photocatalytic activity could be attributed to the efficient Z-direction charge transfer at the WO3/ZnIn2S4 heterostructure interface, thus reducing the recombination rate of the photogenerated carriers of the system. This work provides new insights into the construction of direct Z-scheme heterostructured ZnIn2S4-based photocatalysts for highly efficient photocatalytic H2 evolution.

Graphical abstract: An artificially constructed direct Z-scheme heterojunction: WO3 nanoparticle decorated ZnIn2S4 for efficient photocatalytic hydrogen production

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Supplementary files

Article information


Submitted
28 Nov 2019
Accepted
02 Jan 2020
First published
02 Jan 2020

Sustainable Energy Fuels, 2020, Advance Article
Article type
Paper

An artificially constructed direct Z-scheme heterojunction: WO3 nanoparticle decorated ZnIn2S4 for efficient photocatalytic hydrogen production

Y. Wang, D. Chen, Y. Hu, L. Qin, J. Liang, X. Sun and Y. Huang, Sustainable Energy Fuels, 2020, Advance Article , DOI: 10.1039/C9SE01158G

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