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Hierarchically hollow structured NiCo2S4@NiS for high-performance flexible hybrid supercapacitors

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Abstract

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.

Graphical abstract: Hierarchically hollow structured NiCo2S4@NiS for high-performance flexible hybrid supercapacitors

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Article information


Submitted
24 Nov 2019
Accepted
20 Jan 2020
First published
20 Jan 2020

Nanoscale, 2020, Advance Article
Article type
Paper

Hierarchically hollow structured NiCo2S4@NiS for high-performance flexible hybrid supercapacitors

G. Qu, C. Li, P. Hou, G. Zhao, X. Wang, X. Zhang and X. Xu, Nanoscale, 2020, Advance Article , DOI: 10.1039/C9NR09991C

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