祝贺陈锡安和黄少铭老师指导研究生在advanced science上发表学术论文 | |||
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日期:2018-01-10阅读:次 | |||
标题:molybdenum carbide nanoparticles coated into the graphene wrapping n-doped porous carbon microspheres for highly efficient electrocatalytic hydrogen evolution both in acidic and alkaline media abstact: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 hbetter 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. doi: 10.1002/advs.201700733 通过网址访问原文 | |||
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