期刊
ELECTROCHIMICA ACTA
卷 292, 期 -, 页码 157-167出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.08.110
关键词
Hollow nanoneedle; Ferric-cobalt sulfide; Asymmetric supercapacitor; Carbon fiber paper
资金
- National Natural Science Foundation of China [21704035]
- China Postdoctoral Science Foundation [2017M610304]
- Natural Science Foundation of Jiangsu Province [BK20170544]
- University Natural Science Research of Jiangsu [17KJB430010]
- Jiangsu Province Postdoctoral Science Foundation [1701065C]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
The ever-increasing concerns about global environmental problems and depletion of fossil resources have stimulated intensive research on low-cost and high-performance energy storage materials. Here, we introduce the two-step sulfidation of hierarchical ferric-cobalt sulfide hollow nanoneedles on electrical conductive carbon fiber paper (CFP) for high-performance supercapacitor electrodes. Under the growth regulation of macroporous CFP substrate, prepared free-standing composite paper with tip-welded ferric-cobalt sulfide hollow nanoneedles can offer substantial exposed electroactive sites for Faradaic redox reaction and effectively buffer the drastic volume change during long-term charge-discharge, and also provide fast charge transfer paths through the carbon skeleton for efficient energy storage. Due to these unique features, obtained composite paper electrode delivers a higher specific capacitance (2282 F g(-1) at current density of 1 A g(-1)) than those of the previously reported MCo2S4 based electrodes. Asymmetric supercapacitor assembled using the composite paper as the binder-free positive electrode also shows a high energy density of 86.8 Wh kg(-1) at a power density of 800 W kg(-1), and an impressive 82.3% capacitance retention after 5000 cycles, demonstrating the great potential of this low-cost and free-standing electrodes towards high-performance energy storage. (C) 2018 Elsevier Ltd. All rights reserved.
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