Potential cycling stability of graphene and conducting polymer based composite materials for supercapacitor applications

Tom Lindfors*, Anna Österholm, Róbert E. Gyurcsányi

*Corresponding author for this work

    Research output: Contribution to conferencePosterScientific

    Abstract

    We report the results of the potential cycling stability tests carried out on composite materials consisting of graphene based materials and electrically conducting polymers.

    Composite films were synthesized by electropolymerization of 3,4-ethylenedioxythiophene (EDOT) from aqueous solutions of graphene oxide (GO) functioning as the charge compensating counter anions without any additional additives [1]. Electrochemical reduction was applied to reduce GO in the PEDOT-GO composites to reduced graphene oxide (RGO) [2]. In this work, we have studied the potential cycling stability of both the PEDOT-GO and PEDOT-RGO films and compared them with PEDOT prepared with polystyrene sulfonate (PSS-) as dopant ions.

    In this work, the electropolymerization and characterization of the redox properties of the composite films were studied mainly with cyclic voltammetry, electrochemical impedance spectroscopy, scanning electron microscopy and electrochemical quartz crystal microbalance. Long-term potential cycling of the PEDOT-GO and PEDOT-RGO films were carried out in aqueous electrolyte solutions and were compared to PEDOT-PSS. Preliminary results indicate that PEDOT-RGO has an extended electroactive window compared to PEDOT-PSS. In addition, we report the influence of the electroreduction on the switching ability of the composite films between two oxidation states. A quick switching is crucial for their applicability in supercapacitor and batteries.

    We also present a simple electropolymerization procedure to synthesize PEDOT-RGO films from organic solvents containing RGO. The areal capacitances of the two PEDOT-RGO film types prepared from aqueous and organic solutions will be compared with electropolymerized composites of polyaniline and GO/RGO.

    References:
    [1] A. Österholm, T. Lindfors, J. Kauppila, P. Damlin and C. Kvarnström, Electrochim. Acta, 2012, 83, 463-470; Electrochemical incorporation of graphene oxide into conducting polymer films
    [2] T. Lindfors, A. Österholm, J. Kauppila, M. Pesonen, Electrochim. Acta, 2013, accepted for publication 5.3.2013; Electrochemical reduction of graphene oxide in electrically conducting poly(3,4-ethylenedioxythiophene) composite films
    Original languageEnglish
    Publication statusPublished - 2013
    MoE publication typeO2 Other
    EventInternational Conference on Diamond and Carbon Materials - Riva del Garda, Italy
    Duration: 2 Sep 20135 Sep 2013

    Conference

    ConferenceInternational Conference on Diamond and Carbon Materials
    Country/TerritoryItaly
    CityRiva del Garda
    Period02/09/1305/09/13

    Keywords

    • Composites
    • Graphene oxide
    • Reduced graphene oxide
    • Electrically conducting polymers
    • Potential cycling stability
    • Supercapacitors

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