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Issue 6, 2013
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Sandwich nanocomposites of polyaniline embedded between graphene layers and multi-walled carbon nanotubes for cycle-stable electrode materials of organic supercapacitors

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Abstract

Intrinsically conducting polymers like polyaniline (PANI) demonstrate much higher specific capacitance than carbon based materials for the electrode active materials of supercapacitors, but the cycle-stability of PANI is rather poor. The reason may lie in the internal stress change of PANI due to the counter-anions intercalating/dissociating during doping and dedoping. Here we proposed a sandwich nanocomposite methodology where electroactive PANI was sandwiched between a conducting graphene layer and a multi-walled carbon nanotubes (MWCNTs) layer, i.e., PANI was first deposited on the surface of MWCNTs nanofibers via in situ copolymerization of aniline and p-phenylenediamine in the acidic dispersion of MWCNTs to fabricate the one-dimensional PANI/MWCNTs nanofibers, then the assembly between graphene oxide sheets and PANI/MWCNTs nanofibers was realized by electrostatic interactions, followed by a reduction of the graphene oxide to obtain the sandwich nanocomposites. The hybrids demonstrated superior electrochemical properties in comparison with the pristine PANI in a propylene carbonate/1M Et4N+·BF4 electrolyte. The specific capacitance of the hybrid composites was 259.4 F g−1 at the current density of 0.5 A g−1, and over 76.5% of the initial specific capacitance was retained over 2500 charging/discharging cycles, much better than that for pure PANI (only 38.9% retention).

Graphical abstract: Sandwich nanocomposites of polyaniline embedded between graphene layers and multi-walled carbon nanotubes for cycle-stable electrode materials of organic supercapacitors

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Publication details

The article was received on 27 Sep 2012, accepted on 23 Nov 2012 and first published on 23 Nov 2012


Article type: Paper
DOI: 10.1039/C2RA22323F
Citation: RSC Adv., 2013,3, 1797-1807
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    Sandwich nanocomposites of polyaniline embedded between graphene layers and multi-walled carbon nanotubes for cycle-stable electrode materials of organic supercapacitors

    S. Zhou, H. Zhang, X. Wang, J. Li and F. Wang, RSC Adv., 2013, 3, 1797
    DOI: 10.1039/C2RA22323F

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