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Electrochemical behaviour of graphene–poly (3,4-ethylenedioxythiophene) (PEDOT) composite electrodes for supercapacitor applications

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Abstract

In this paper, we report on the electrochemical characteristics of graphene–PEDOT composite electrodes. The electrodes were made of indium tin oxide (ITO) substrates by simple processes of electrophoretic deposition of graphene followed by electropolymerization of EDOT monomer. The composite electrode was obtained by electrochemical measurements, a median specific capacitance of 1410 F/g and a median area capacitance of 199 mF cm −2 at a scan rate of 40 mVs −1. The composite showed good stability characteristics after repeated scans in cyclic voltammmetry and fared much better than a thin film of PEDOT. The thermal stability of the composite is also much superior when compared to the polymer with a weight loss temperature of 350 °C for the composite and 250 °C for the polymer, respectively. The above electrochemical and thermal behaviours of the composite are correlated to the unique morphology of electrodeposited graphene that provides a conductive and high surface area template for electropolymerization.

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Acknowledgments

The authors acknowledge the Department of Science and Technology (Grant Nos: 100/IFD/8495/2007-2008 and 100/IFD/8495/2009-2010), Government of India and the Ministry of New and Renewable Energy (Grant No: 31/05/2009-10/PVSE), Government of India, for supporting this work. The authors are also very grateful to Amrita Institute of Medical Sciences for infrastructure support to this programme.

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Authors and Affiliations

  1. Amrita Centre for Nanosciences and Molecular Medicine, Amrita Institute of Medical Sciences, Ponekkara P. O., Kochi, 682 041, India

    DONA JACOB, P A MINI, AVINASH BALAKRISHNAN, S V NAIR & K R V SUBRAMANIAN

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  1. DONA JACOB
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  2. P A MINI
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  3. AVINASH BALAKRISHNAN
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Correspondence to S V NAIR or K R V SUBRAMANIAN.

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JACOB, D., MINI, P.A., BALAKRISHNAN, A. et al. Electrochemical behaviour of graphene–poly (3,4-ethylenedioxythiophene) (PEDOT) composite electrodes for supercapacitor applications. Bull Mater Sci 37, 61–69 (2014). https://doi.org/10.1007/s12034-013-0610-9

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  • DOI: https://doi.org/10.1007/s12034-013-0610-9

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