期刊
ELECTROCHIMICA ACTA
卷 330, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.135212
关键词
PVP-based carbon nanofibers; Electrospinning; Pyrolysis of g-C3N4; Nitrogen-doping; Supercapacitor
资金
- National Natural Science Foundation of China [51972051, 51572045, 51732003, 61803080, 91233204]
- 111 Project [B13013]
- Natural Science Foundation of Jilin Province of China [20160101313JC]
- China Postdoctoral Science Foundation [2017M610188, 2018T110240]
- Science and Technology Development Program of Jilin Province [20180520192JH]
- The 13th five-year plan Science and Technology Research Project of the Education Department of Jilin Province [JJKH20180018KJ]
We describe a novel approach to prepare nitrogen-doped carbon nanofibers for applications in electrochemistry. Freestanding carbon nanofibers (NCNFs) were first prepared by the carbonization of electrospun PVP nanofibers. Effective nitrogen doping was subsequently achieved by thermal treatment of the PVP-based carbon nanofibers via the pyrolysis of g-C3N4. The nitrogen content in the NCNFs was tuned from 6.37 to 13.72 at% via the treatment temperature. A surface adsorption and internal diffusion process helped explain the doping mechanism via thermogravimetric analysis/Fourier-transform infrared spectroscopy (TGA/FTIR) and X-ray photoelectron spectroscopy (XPS) analysis. The NCNFs obtained at 800 degrees C showed suitable nitrogen contents, good conductivities, and high electrochemical performances. The NCNFs exhibited a markedly enhanced specific capacitance of 265 F/g at a current density of 1 A/g. This is about ten times that of pure PVP-based carbon nanofibers (26 F/g at 1 A/g). They also exhibited a high rate capability (131 F/g at 16 A/g) and excellent stability. The contributions of the pyridinic N state to the pseudo-capacitances and the contribution of the quaternary N state to the conductivity produced synergistic effects leading to the improved electrochemical properties. In addition, a high cell capacitance of 32 F/g was achieved at a current density of 0.5 A/g based on the obtained NCNFs. The new nitrogen doping strategy can likely be used to obtain other types of nitrogen-doped carbon materials or nitrogen-doped semiconductors. (C) 2019 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据