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Hexagonal Prism-like Hierarchical Co9S8@Ni(OH)2 Core-shell Nanotubes on Carbon Fibers for High-Performance Asymmetric Supercapacitors

Abstract

In this work, novel hierarchical Co9S8@Ni(OH)2 core-shell nanotube arrays supported on carbon fibers have been rationally designed and synthesized for supercapacitors. The one-dimensional Co9S8 nanotubes serve as an ideal backbone to improve the electrical conductivity of Ni(OH)2 nanosheets, while the ultrathin and redox active Ni(OH)2 nanosheets electrodeposited on the Co9S8 nanotubes greatly enhance the surface area and provide more electroactive sites for Faradaic reaction. The optimized Co9S8@Ni(OH)2 electrode shows high specific capacitances of 1345 F g-1 at the current density of 1 A g-1 and 675 F g-1 even at 10 A g-1. An asymmetric supercapacitor was successfully assembled with this unique hybrid nanostructure as the anode and an active carbon film as cathode. The as-fabricated device exhibits high energy density (31.35 Wh kg-1 at 252.8 W kg-1), high power density (2500 W kg-1 at 12.5 Wh kg-1), as well as a long-term cycle stability (97.3 % retention of its initial capacitance after 5000 cycles). The as-prepared hierarchical nanostructure shows great potential as a promising electrode material for energy storage application.

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Publication details

The article was received on 14 Aug 2017, accepted on 05 Oct 2017 and first published on 06 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA07160D
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Hexagonal Prism-like Hierarchical Co9S8@Ni(OH)2 Core-shell Nanotubes on Carbon Fibers for High-Performance Asymmetric Supercapacitors

    Z. Fangfang, M. Yan, L. Yu, H. Shen, Y. Lei and W. Shi, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA07160D

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