期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 556, 期 -, 页码 224-231出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2019.08.043
关键词
1T/2H-WS2; 2D-C3N4; Multiple; Colloidal; H-2 production
资金
- National Natural Science Foundation of China [51372234, 21301187]
- Shandong Provincial Natural Science Foundation, China [ZR2018QB001]
Two-dimensional (2D) sulfides have attracted much attention as a promising photocatalyst for the hydrogen evolution reaction. In this work, a highly active and stable vertical 1T/2H-WS2 nanoflakes grown on 2D-C3N4 with multiple charge transfer channels through a simple and efficient colloidal strategy is reported. This three-dimensional (3D) composite presents the usual semiconducting 2H phase WS2 as well as the unusual distorted octahedral 1T phase WS2, which vertically connect 2D-C3N4 constructing an interesting 3D structure with more active sites. The H-2 production rate of the optimal product has reached 350.75 mu mol.g(-1).h(-1), which is 66.8 and 8.2 times higher than the rate of 2D-C3N4 and 1T/2H-WS2 respectively. The predominant charge transfer occurs between 2D-C3N4 and 2H-WS2 nanoflakes due to their vertical connection and the matched energy structure while the existence of the metallic 1T-WS2 acts as a cocatalyst with an enhanced conductivity to provide multiple charge transfer channels over its basal and edge sites for H+ reduction. (C) 2019 Elsevier Inc. All rights reserved.
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