Journal
CHINESE JOURNAL OF CHEMICAL ENGINEERING
Volume 32, Issue -, Pages 416-422Publisher
CHEMICAL INDUSTRY PRESS CO LTD
DOI: 10.1016/j.cjche.2020.09.055
Keywords
Energy; Electrochemistry; Nanomaterials; Hollow carbon nanofibers; Freestanding electrode; Lithium-ion batteries
Categories
Funding
- National Natural Science Foundation of China [51972270, 51702262, 51911530212, 51872240, 51672225, 61805201]
- China Postdoctoral Science Foundation [2018T111093, 2018M643732, 2018BSHYDZZ57]
- Natural Science Foundation of Shaanxi Province [2020JZ-07]
- Key Research and Development Program of Shaanxi Province [2019TSLGY07-03]
- Fundamental Research Funds for the Central Universities [3102019JC005, 3102019ghxm004]
- Research Fund of the State Key Laboratory of Solidification Processing (NPU), China [2019-QZ-03]
- 1000 Youth Talent Program of China
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The study developed a porous, nitrogen-enriched freestanding hollow carbon nanofiber electrode material with a high specific surface area and sufficient nitrogen doping functionality. When used as a self-supporting anode in lithium-ion batteries, it exhibits high capacity, high-rate property, and good cycling stability.
One-dimensional porous carbons bearing high surface areas and sufficient heteroatom doped functionalities are essential for advanced electrochemical energy storage devices, especially for developing freestanding film electrodes. Here we develop a porous, nitrogen-enriched, freestanding hollow carbon nanofiber (PN-FHCF) electrode material via filtration of polypyrrole (PPy) hollow nanofibers formed by in situ self-degraded template-assisted strategy, followed by NH3-assisted carbonization. The PN-FHCF retains the freestanding film morphology that is composed of three-dimensional networks from the entanglement of 1D nanofiber and delivers 3.7-fold increase in specific surface area (592 m(2).g(-1)) compared to the carbon without NH3 treatment (FHCF). In spite of the enhanced specific surface area, PN-FHCF still exhibits comparable high content of surface N functionalities (8.8%, atom fraction) to FHCF. Such developed hierarchical porous structure without sacrificing N doping functionalities together enables the achievement of high capacity, high-rate property and good cycling stability when applied as self-supporting anode in lithium-ion batteries, superior to those of FHCF without NH3 treatment. (C) 2021 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights reserved.
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