Journal
ACS NANO
Volume 12, Issue 3, Pages 3030-3041Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b00901
Keywords
carbon cloth; Ni nanotubes; Al-doped cobalt sulfide; self-standing; all-solid-state supercapacitors
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Funding
- National Science Fund for Distinguished Young Scholars [51425304]
- NSFC-DFG Joint Research Project [51761135114]
- National Natural Science Foundation of China [21704038, 51763018]
- Natural Science Foundation of Jiangxi Province [20171ACB21009]
- National Postdoctoral Program for Innovative Talents [BX201700112]
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Although cobalt sulfide is a promising electrode material for supercapacitors, its wide application is limited by relative poor electrochemical performance, low electrical conductivity, and inefficient nanostructure. Here, we demonstrated that the electrochemical activity of cobalt sulfide could be significantly improved by Al doping. We designed and fabricated hierarchical core-branch Al-doped cobalt sulfide nanosheets anchored on Ni nanotube arrays combined with carbon cloth (denoted as CC/H-Ni@Al-Co-S) as an excellent self-standing cathode for asymmetric supercapacitors (ASCs). The combination of structural and compositional advantages endows the CC/H-Ni@Al-Co-S electrode with superior electrochemical performance with high specific capacitance (1830 F g(-1)/2434 F g(-1) at 5 mV s(-1)/1 A g(-1)) and excellent rate capability (57.2%/72.3% retention at 1000 mV s(-1)/100 A g(-1)). The corresponding all-solid-state ASCs with CC/H-Ni@Al-Co-S and multilayer graphene/CNT film as cathode and anode, respectively, achieve a high energy density up to 65.7 W h kg(-1) as well as superb cycling stability (90.6% retention after 10 000 cycles). Moreover, the ASCs also exhibit good flexibility and stability under different bending conditions. This work provides a general, effective route to prepare high-performance electrode materials for flexible all-solid-state energy storage devices.
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