Journal
CERAMICS INTERNATIONAL
Volume 43, Issue 2, Pages 2155-2164Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2016.10.197
Keywords
NiCo2S4@NiCo2O4; Nanocolumn arrays; Core-shell; Flexible; Asymmetric supercapacitors
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Funding
- National Natural Science Foundation of China, China [51275195, 91323106]
- National Basic Research Program of China [2015CB057205]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT13017]
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The development of wearable electronics has created a surge of interest in designing flexible energy storage device with high energy density and long lifespan. In this work, we have successfully fabricated a flexible asymmetric supercapacitor (ASC) based on the NiCo2S4@NiCo2O4 nanocolumn arrays (NCAs). The nickel cobalt sulfide/oxide core-shell nanostructures were rationally synthesized through a facile stepwise approach. The NiCo2S4@NiCo2O4 NCAs based electrode delivered a high specific capacitance of 2258.9 F g(-1) at a current density of 0.5 A g(-1). The as-assembled flexible ASC device exhibited a high energy density of 44.06 Wh kg(-1), a high power density of 6.4 kW kg(-1), and excellent cycling stability by retaining 92.5% after 6000 cycles. Excitingly, the electrochemical property of the ASC device could be maintained under severe bending, indicating superior flexibility and mechanical stability. The NiCo2S4@NiCo2O4 core-shell NCAs possess enormous potential for future wearable electronic applications.
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