期刊
CHEMICAL ENGINEERING JOURNAL
卷 398, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.125602
关键词
WO3/CdS/WS2 composite; Z-scheme; Heterojunction; Photocatalysts; Hydrogen evolution
资金
- National Natural Science Foundation of China [51972287, 51502269]
- China Postdoctoral Science Foundation [2019M662515]
- Key R&D and Promotion Special Project (Science and Technology Research) of Henan Province [22170024]
Efficient charge separation and high photo-stability are crucial for sustainable solar-to-hydrogen energy conversion over photocatalysts. Here we describe a facile synthetic strategy to construct the novel direct Z-scheme tandem heterojunction consisting of the zero-dimensional (0D) ultrafine cadmium sulfide (CdS) nanograins and the two-dimensional (2D) ultrathin tungsten trioxide/tungsten disulfide (WO3/WS2) nanoplate matrixes. The WS2 co-catalyst combined with the direct Z-scheme electron transfer channels in WO3/CdS interfacial junctions facilitate the spatial separation and directional migration of photo-excited charge carriers. This smart design enables the optimized Z-scheme WO3/CdS/WS2 hybrid exhibit a high photocatalytic H-2 evolution activity of 14.34 mmoL.h(-1).g(-1) and an outstanding apparent quantum efficiency of 22.96% at 435 nm.
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