期刊
ELECTROCHIMICA ACTA
卷 176, 期 -, 页码 255-264出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.07.033
关键词
tungsten disulfide; sulfur vapor; chemical vapor deposition; hydrogen evolution reaction
资金
- National Science Foundation of China (NSFC) [51373154]
- Program for Innovative Research Team of Zhejiang Sci-Tech University
- 521 Talent Project of Zhejiang Sci-Tech University
Three-dimensional (3D) WS2-nanoflower decorated and two-dimensional (2D) WS2-nanosheet (NS) wrapped carbon nanofiber (CNF) nanostructures are constructed through a simple approach using (NH4)(2)WS4 contained electrospun polyacrylonitrile nanofibers (W-PAN NFs) and S powder as the precursor. (NH4)(2)WS4 are thermally decomposed into WS2 nanoparticles (NPs) during a pre-oxidation treatment of W-PAN NFs. Interestingly, the introducing of S vapor during the carbonization of W-PAN NFs results in unexpected migration of WS2 nanoparticles (WS2 NPs) from the inside of CNFs to the surface to form WS2 NSs or WS2 nanoflowers. It is believed that S not only controls the initial nucleation of WS2 on the surface of CNFs but also induces the migration of WS2 NPs and directs the growth of WS2 into various morphologies. The synthesized catalysts are directly used as the electrode for hydrogen evolution reaction (HER) and they exhibit good electrocatalytic activity. (C) 2015 Elsevier Ltd. All rights reserved.
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