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Issue 114, 2015
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Novel graphene/polyaniline/MnOx 3D-hydrogels obtained by controlled morphology of MnOx in the graphene/polyaniline matrix for high performance binder-free supercapacitor electrodes

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Abstract

A novel three dimensional ternary composite graphene-based hydrogel was prepared using a simple hydrothermal reaction. The graphene/polyaniline/MnOx hydrogel named as PGM-HCl, obtained by the controlled morphology of MnOx by preparing it in an acidic environment using hydrochloric acid (HCl), offered an extremely high specific capacitance of 955 F g−1 at a current density of 1 A g−1 and a capacitance retention of 89% after 1000 cycles and 69.1% after 5000 cycles at 20 A g−1. The synergistic effects created by the pseudocapacitance of PANI, MnOx and the electrochemical double layer capacitance of graphene highly improved the overall electrochemical performance of these hydrogels compared to the performances of the individual constituents. The electrode prepared from this material gave an extremely high specific energy density of 61.2 W h kg−1 even at a high power density of 4.5 kW kg−1. The composite had the superior advantage of being used directly for binder free supercapacitor electrodes and made use of low cost raw materials making it a very promising candidate for cost effective, large scale and high energy applications. A hydrogel PGM was also prepared in the absence of HCl using a purely hydrothermal reaction under the same reaction conditions, for comparison. Thus, this study opens the exciting untapped potential in engineering and synthesizing such composites with existing low cost materials for high performance energy storage devices like supercapacitors.

Graphical abstract: Novel graphene/polyaniline/MnOx 3D-hydrogels obtained by controlled morphology of MnOx in the graphene/polyaniline matrix for high performance binder-free supercapacitor electrodes

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Publication details

The article was received on 21 Aug 2015, accepted on 09 Oct 2015 and first published on 03 Nov 2015


Article type: Paper
DOI: 10.1039/C5RA16884H
Citation: RSC Adv., 2015,5, 94388-94396
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    Novel graphene/polyaniline/MnOx 3D-hydrogels obtained by controlled morphology of MnOx in the graphene/polyaniline matrix for high performance binder-free supercapacitor electrodes

    A. Jayakumar, Y. Yoon, R. Wang and J. Lee, RSC Adv., 2015, 5, 94388
    DOI: 10.1039/C5RA16884H

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