期刊
ADVANCED SCIENCE
卷 5, 期 3, 页码 -出版社
WILEY
DOI: 10.1002/advs.201700733
关键词
electrocatalytic hydrogen evolution; graphene wrapping N-doped porous carbon microspheres; molybdenum carbide; spray-drying
资金
- National Natural Science Foundation of China [51402217, 51672193]
- National Science Fund for Distinguished Young Scholars [51420105002]
Molybdenum carbide (Mo2C) is recognized as an alternative electrocatalyst to noble metal for the hydrogen evolution reaction (HER). Herein, a facile, low cost, and scalable method is provided for the fabrication of Mo2C-based eletrocatalyst (Mo2C/G-NCS) by a spray-drying, and followed by annealing. As-prepared Mo2C/G-NCS electrocatalyst displays that ultrafine Mo2C nanopartilces are uniformly embedded into graphene wrapping N-doped porous carbon microspheres derived from chitosan. Such designed structure offer several favorable features for hydrogen evolution application: 1) the ultrasmall size of Mo2C affords a large exposed active sites; 2) graphene-wrapping ensures great electrical conductivity; 3) porous structure increases the electrolyte-electrode contact points and lowers the charge transfer resistance; 4) N-dopant interacts with H+ better than C atoms and favorably modifies the electronic structures of adjacent Mo and C atoms. As a result, the Mo2C/G-NCS demonstrates superior HER activity with a very low overpotential of 70 or 66 mV to achieve current density of 10 mA cm(-2), small Tafel slope of 39 or 37 mV dec(-1), respectively, in acidic and alkaline media, and high stability, indicating that it is a great potential candidate as HER electrocatalyst.
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