期刊
CHEMICAL ENGINEERING JOURNAL
卷 420, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.130480
关键词
W2C/C nanofibers; Electrospinning; Carbothermal hydrogen reaction; Hydrogen evolution reaction
资金
- National Natural Science Foundation of China, China [21875187]
- Natural Science Foundation of Shaanxi Province, China [2020JQ726]
Ditungsten carbide (W2C) embedded in carbon nanofibers (W2C/C NFs) shows excellent electrocatalytic performance, especially in alkaline media. The one-dimensional nanostructure and strong coupling of W2C within the carbon matrix synergistically enhance electron transport and active sites, leading to significant improvement in hydrogen evolution reaction (HER) activity.
As a promising electrocatalyst for the hydrogen evolution reaction (HER), ditungsten carbide (W2C) has aroused extensive attention. Pure-phase W2C nanoparticles embedded in carbon nanofibers (W2C/C NFs) could provide abundant accessible catalytically active sites and facilitate electron transfer for efficient HER. In this work, W2C/C NFs were fabricated by an electrospinning-assisted synthetic strategy. The optimized sample W2C/C NFs-20 exhibits excellent electrocatalytic performances in wide-pH range, especially in alkaline media, showing low overpotential (eta) of 81, 137, and 157 mV to reach 10, 100, and 200 mA cm(-2), respectively. One dimensional nanostructure and the strong coupling of W2C within the carbon matrix synergistically brought faster electron transport and more active sites, and thus a significant enhancement in HER activity. Based on the strategy reported here, other transition metal carbide nanofibers could be prepared to expand opportunities in various catalytic applications.
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