Construction of nickel cobalt sulfide nanosheet arrays on carbon cloth for performance-enhanced supercapacitor
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第12期
论文作者：Tao Liu Jiahao Liu Liuyang Zhang Bei Cheng Jiaguo Yu
文章页码：113 - 121
摘 要：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.
Tao Liu1，Jiahao Liu1，Liuyang Zhang1，Bei Cheng1，Jiaguo Yu1,2
1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology2. School of Materials Science and Engineering, Zhengzhou University
摘 要：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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