Journal
NANOSCALE
Volume 12, Issue 7, Pages 4686-4694Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nr09991c
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Funding
- National Natural Science Foundation of China [51672109]
- Natural Science Foundation of Shandong Province for Excellent Young Scholars [ZR2016JL015]
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Hierarchical nanostructures with outstanding electrochemical properties and mechanical stability are ideal for constructing flexible hybrid supercapacitors. Herein, hierarchically hollow NiCo2S4@NiS nanostructures were designed and synthesized by sulfurizing the hierarchical NiCo double hydroxides (DHs) coated with nickel hydroxide nanostructures on carbon fabrics (NiCo-DHs@Ni(OH)(2)/CF), which trigger excellent electrochemical performances. The NiCo2S4@NiS/CF exhibits a high specific capacity of 1314.0 C g(-1) at a current density of 1 A g(-1), and maintains the rate performance at about 79.2% of the initial capacity at 30 A g(-1). The hybrid supercapacitors of NiCo2S4@NiS//AC display a high energy density of 62.4 W h kg(-1) at a power density of 800 W kg(-1) with a remarkable cycling stability (96.2% of initial capacitance after 5000 cycles) and robust mechanical flexibility (no obvious decay of specific capacitance during various deformations). Consequently, NiCo2S4@NiS electrodes are expected to be a promising candidate for new smart energy storage devices with high security, stability and flexibility.
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