期刊
CHINESE JOURNAL OF CATALYSIS
卷 43, 期 10, 页码 2615-2624出版社
ELSEVIER
DOI: 10.1016/S1872-2067(22)64134-2
关键词
WO3; Photocatalysis; S-Scheme; Hydrogen evolution
资金
- National Natural Science Foundation of China [21978276, 51672312]
- Fundamental Research Funds for the Central Universities [2652019157, 2652019158, 2652019159]
- Beijing Municipal Education Commission Key Science and Technology Project Fund [KZ201910853043]
- FCT/MCTES (LAQV) [CEECINST/00102/2018, UIDB/50006/2020, UIDP/50006/2020]
In-plane epitaxial growth of ZnIn2S4 nanosheets on the surface of hexagonal phase WO3 nanorods was achieved, forming a unique 3D heterostructure. The heterostructure not only enlarged the specific surface area, but also improved the light harvesting ability, resulting in significantly enhanced photocatalytic hydrogen evolution.
In-plane epitaxial growth of ZnIn2S4 nanosheets on the surface of hexagonal phase WO3 nanorods was achieved by a facile solvothermal method. The unique 3D heterostructure not only enlarged the specific surface area, but also red-shifted the absorption edge from 381 to 476 nm to improve the light harvesting ability, which largely enhanced the photocatalytic hydrogen evolution. The H2 pro-duction rate of the best performing ZnIn2S4/WO3 photocatalyst (ZIS-2.5/W, the material with a molar rate of ZnIn2S4 (ZIS) to WO3 (W) of 2.5) was 300 iimol center dot g-1 center dot h-1, around 417 times and 2 times higher than the rates of pristine WO3 and ZnIn2S4, respectively. The apparent quantum efficiency for ZIS-2.5/W composite was up to 2.81% at 400 nm. Based on the difference in Fermi levels between WO3 and ZnIn2S4, and the distribution of the redox active sites on WO3/ZnIn2S4 heterostructure, a S-scheme electron transfer mechanism was proposed to illustrate the improved photocatalytic activity of WO3/ZnIn2S4 heterojunction, which not only stimulated the spatial separation of the photogenerated charge carriers, but also maintained the strong reduction/oxidation ability of the photocatalyst. (c) 2022, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
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