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Issue 14, 2018
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One-step synthesis of hollow C-NiCo2S4 nanostructures for high-performance supercapacitor electrodes

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Abstract

Carbon-containing NiCo2S4 hollow-nanoflake structures were fabricated by a one-step solvothermal method using CS2 as a single source for sulfidation and carbonization. The reaction mechanism for the hollow structure with carbon residues was explored based on the formation of a bis(dithiocarbamate)–metal complex and the Kirkendall effect during solvothermal synthesis. The NiCo2S4 nanoflake electrode exhibited a high specific capacitance of 1722 F g−1 (specific capacity 688.8 C g−1) at a current density of 1 A g−1 and an excellent cycling stability (capacity retention of 98.8% after 10 000 cycles). The as-fabricated asymmetric supercapacitor based on NiCo2S4 nanoflakes and activated carbon electrodes revealed a high energy density of 38.3 W h kg−1 and a high power density of 8.0 kW kg−1 with a capacitance retention of 91.5% and a coulombic efficiency of 95.6% after 5000 cycles, highlighting its great potential for practical supercapacitor applications.

Graphical abstract: One-step synthesis of hollow C-NiCo2S4 nanostructures for high-performance supercapacitor electrodes

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Supplementary files

Article information


Submitted
02 Oct 2017
Accepted
01 Mar 2018
First published
02 Mar 2018

Nanoscale, 2018,10, 6620-6628
Article type
Paper

One-step synthesis of hollow C-NiCo2S4 nanostructures for high-performance supercapacitor electrodes

S. G. Mohamed, I. Hussain and J. Shim, Nanoscale, 2018, 10, 6620
DOI: 10.1039/C7NR07338K

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