期刊
ELECTROCHIMICA ACTA
卷 370, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2021.137713
关键词
MnO; Carbon nanofiber; Supercapacitor; Extended potential windows; LiMn2O4
资金
- Natural Science Foundation of Shanghai [20ZR14020 0 0]
- Natural Science Foundation of Zhejiang Province [LQ20E030017]
- Jiaxing Science and Technology Project [2019AY11013]
- Innovation Program of Shanghai Municipal Education Commission [2017-01-07-00-03-E0 0 055]
- Fundamental Research Funds for the Central Universities
- DHU Distinguished Young Professor Program
- Key Laboratory of Yarn Materials Forming and Composite Processing Technology, Zhejiang Province [MTC 2020-06]
MnO/carbon nanofiber composite is proven to be a high-performance electrode material for supercapacitors. LiMn2O4 nanoparticles are decorated on polyacrylonitrile nanofibers and then converted to MnO under synergistic annealing, resulting in MnO/CNF composite with extended potential window and high capacitance.
MnO/carbon nanofiber (CNF) composite is demonstrated as a high-performance electrode material for supercapacitors. LiMn2O4 (LMO) nanoparticle-decorated polyacrylonitrile (PAN) nanofibers are fabricated via electrospinning. Afterwards, LMO is converted to MnO and PAN is fully carbonized under synergistic annealing, resulting in MnO/CNF composite. The composite exhibits electrochemically active in an extended potential window of-1.0 - 0.8 V vs. Ag/AgCl. Moreover, a two-step electrochemical stimulation is observed for MnO at 0.0 V and 0.4 V corresponding to the phase transformations from MnO to Mn3O4 and from Mn3O4 to MnO2, respectively. As a result, the composite presents a high capacitance of 409.7 F g(-1) at 1 A g(-1) in-0.4 - 0.8 V vs. Ag/AgCl due to the phase transformations of MnO. Also, the composite owns 301.8 F g(-1) at 1 A g(-1) in -1.0 - 0.2 V vs. Ag/AgCl, which is 2.65 times the value of CNFs owing to the enhanced conductivity and surface redox by incorporating MnO. Finally, a supercapacitor with a working voltage of 1.8 V is realized using MnO/CNF composite as both negative and positive electrodes. (C) 2021 Elsevier Ltd. All rights reserved.
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