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Issue 16, 2017
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Modified chalcogens with a tuned nano-architecture for high energy density and long life hybrid super capacitors

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Abstract

A novel in situ vanadium-modified NiCo2S4 wrapped with graphene sheets was synthesized using a simple solvothermal technique. The vanadium-modified sample (VNCS) demonstrated superior electrochemical performance over graphene-wrapped NiCo2S4 (GNCS) and pure NiCo2S4 (NCS) samples, with a specific capacitance of 1340 F g−1 at a current density of 2 A g−1. The VNCS sample also showed outstanding capacitance retention at 50 A g−1 (1024 F g−1), which is 430% higher than that of the NCS sample. The cycling stability of VNCS was significantly improved by more than 140% compared to the NCS sample with less than 10−3 F per cycle loss in capacitance after 10 000 cycles. We also report the fabrication of hybrid supercapacitors (HSCs) using three different materials for the faradaic electrode. The VNCS-HSCs showed significant improvements in all electrochemical performance measurements compared to NCS-HSCs. The capacitance retention at 50 A g−1 was improved by more than 260% and the long cycling stability was improved by more than 180% after 10 000 cycles. The VNCS-HSC delivered an energy density of 45.9 W h kg−1 at 0.87 kW kg−1 and maintained a superior energy density of 33.6 W h kg−1 at 9 kW kg−1 indicating the excellent potential of this material in hybrid super capacitor applications.

Graphical abstract: Modified chalcogens with a tuned nano-architecture for high energy density and long life hybrid super capacitors

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Publication details

The article was received on 26 Jan 2017, accepted on 02 Mar 2017 and first published on 02 Mar 2017


Article type: Paper
DOI: 10.1039/C7TA00897J
Citation: J. Mater. Chem. A, 2017,5, 7523-7532
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    Modified chalcogens with a tuned nano-architecture for high energy density and long life hybrid super capacitors

    S. Abureden, F. M. Hassan, G. Lui, S. Sy, R. Batmaz, W. Ahn, A. Yu and Z. Chen, J. Mater. Chem. A, 2017, 5, 7523
    DOI: 10.1039/C7TA00897J

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