期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 764, 期 -, 页码 1-9出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.06.045
关键词
W18O49 nanowire; Z-scheme; Graphitic carbon nitride; Photocatalytic hydrogen evolution
资金
- National Natural Science Foundation of China [21547014, 21776049]
- Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology)
Novel Z-scheme W18O49 nanowire-g-C3N4 nanosheet composite photocatalysts were prepared by a facile solvothermal process. The morphology of W18O49 nanocrystals was significantly changed from urchin sphere to nanowire bundles with the increase of C3N4 quantity. The W18O49-g-C3N4 composites enhance the ability of harvesting visible light, and promote the charge transfer across the composite interface. All the as-prepared composites show higher photocatalytic activity of hydrogen production than that of pure W18O49 and g-C3N4. And the WCN50 composite with 50 mg of g-C3N4 displays the optimal photocatalytic activity with the highest hydrogen production rate of 1.700 mmol g(-1) h(-1) under visible light-irradiation. The improved photocatalytic activity is due to the stronger light harvesting ability, the Z-scheme charge transfer mechanism to promote the interface charge transfer, and the prolonged lifetime of photogenerated electrons. Our work will provide a valuable reference for the design of highly efficient Zscheme photocatalysts for efficiently converting solar energy into chemical fuels. (C) 2018 Elsevier B.V. All rights reserved.
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