Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 280, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.119456
Keywords
Separated dual cocatalyst; Non-noble metal; Photo-assisted synthesis; g-C3N4; Photocatalytic H-2 evolution
Funding
- National Natural Science Foundation of China [21806059, 21706102]
- Natural Science Foundation of Jiangsu Higher Education institution [17KJB610006]
- China Postdoctoral Science Foundation [2018M630524]
- Hong Kong Scholars Program [XJ2018031]
- Research Grant Council, Hong Kong SAR Government [GRF14100115]
- Technology and Business Development Fund, The Chinese University of Hong Kong [TBF18SCI006]
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The novel g-C3N4/Co3O4/MoS2 heterojunction shows significantly improved photocatalytic H2 evolution (PHE) activity compared to other heterojunctions. Rapid electron-hole separation and charge species transferring through both Z-scheme and Type-I routes contribute to the enhanced PHE.
The dual cocatalysts photocatalytic heterostructures are beneficial for water splitting. Here we report a simple photo-assisted synthesis of novel g-C3N4/Co3O4/MoS2 heterojunction with low-cost Co3O4 (oxidation) and MoS 2 (reduction) cocatalyst separately deposited onto g-C3N4 nanosheets. Driven by the synergy between Co3O4 and MoS2, the photocatalytic H2 evolution (PHE) activity of g-C3N4/Co3O4 -1.9/MoS2-0.9 under visible light irradiation is about 885, 25.6 and 18.2 times better than those for g-C3N4, g-C3N4 /Co3O4-1.9 and g-C3N4 /MoS2-0.9, respectively, and is also higher than those of g-C3N4 based heterojunctions decorated by MoS 2 , dual MoS2- and other metal sulfides-based cocatalysts. The g-C3N4/Co3O4-1.9/MoS2-0.9 exhibits stable PHE in the recycle experiment and in various real water matrices. Detail characterization reveals that rapid electron-hole separation and charge species transferring through both Z-scheme and Type-I routes contribute to the improved PHE. With this synthetic strategy, the reduction cocatalyst can be extended to NiS (CoS), and the acquired g-C3N4/Co3O4-1.9/NiS (CoS) also possesses synergistically efficient PHE.
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