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材料科学
Construction of nickel cobalt sulfide nanosheet arrays on carbon cloth for performance-enhanced supercapacitor
Materials featured with self-supported three-dimensional network, hierarchical pores and rich electrochemical active sites are considered as promising electrodes for pseudocapacitors. Herein, a novel strategy for the growth of nickel-cobalt bisulfide(Ni Co S) nanosheets arrays on carbon cloth(CC) as supercapacitor electrodes is reported, involving deposition of two-dimensional metal-organic framework(MOF) precursors on the CC skeletons, conversion of MOF into nickel-cobalt layered double-hydroxide by ion exchange process and formation of Ni Co S by a sulfidation treatment. The Ni Co S nanosheets with rough surface and porous structures are uniformly anchored on the CC skeletons. The unique architecture endows the composite(Ni Co S/CC) with abundant accessible active sites. Besides, robust electrical/mechanical joint between the nanosheets and the substrates is attained, leading to the improved electrochemical performance. Moreover, an asymmetric supercapacitor device is constructed by using Ni Co S/CC and activated carbon as a positive electrode and a negative electrode, respectively. The optimized device exhibits a high specific capacitance, large energy density and long cycle life. The Ni Co S/CC electrode with intriguing electrochemical properties and mechanical flexibility holds great prospect for next-generation wearable devices.
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Journal of Materials Science & Technology
2020年12期

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