Hierarchically structured Co9S8@NiCo2O4 nanobrushes for high-performance flexible asymmetric supercapacitors

被引:137
作者
Liu, Qun [1 ]
Hong, Xiaodan [1 ]
Zhang, Xin [1 ]
Wang, Wei [1 ]
Guo, Wenxi [1 ]
Liu, Xiangyang [1 ,2 ]
Ye, Meidan [1 ]
机构
[1] Xiamen Univ, Res Inst Biornimet & Soft Matter, Dept Phys, Fujian Prov Key Lab Soft Funct Mat Res, Xiamen 361005, Peoples R China
[2] Natl Univ Singapore, Fac Sci, Dept Phys, Singapore, Singapore
基金
中国国家自然科学基金;
关键词
Co9S8@NiCo2O4; Hierarchical structure; Asymmetric supercapacitor; Cycle stability; Flexibility; NANOSHEET ARRAYS; NANOTUBE ARRAYS; RATIONAL DESIGN; CARBON; ELECTRODES; FABRICATION; NANORODS; GROWTH; FILMS; PAPER;
D O I
10.1016/j.cej.2018.09.095
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Hierarchically structured Co9S8@NiCo2O4 nanobrushes constructing by NiCo2O4 nanosheets grown on Co9S8 hollow nanoneedles are first fabricated on carbon cloth substrates via a multi-step route. Remarkably, such Co9S8@NiCo2O4 electrode processes multiplied electrochemical performance as compared to single Co9S8 and NiCo2O4 electrodes. It displays high-performance electrochemical behavior, achieving a specific capacitance of 1966 F g(-1) at 1 A g(-1) while maintaining excellent stability with about 92.9% capacitance retention after 5000 cycles. The flexible solid-state asymmetric supercapacitor based on this Co9S8@NiCo2O4 electrode exhibits a high specific capacitance of over 250 F g(-1) at 1 A g(-1), and delivers a high energy density of 86Wh kg(-1) at 792 W kg(-1) and a maximum specific power of 11360 W kg(-1) at 64 Wh kg(-1). Moreover, the supercapacitor holds more than 84.2% capacitance retention after 10,000 cycles at 10 A g(-1) and demonstrates good durability after different deformation, suggesting its outstanding cycle stability and flexibility. Thus, the Co9S8@NiCo2O4 electrode with special heterogeneous structures shows the potential application in wearable energy storage devices.
引用
收藏
页码:985 / 993
页数:9
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