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Degradation-induced Capacitance: A New Insight into the Superior Capacitive Performance of Polyaniline/Graphene Composites

Abstract

Polyaniline/graphene (PANI/graphene) composites are of the most investigated electrode materials for supercapacitors, owing to their high specific capacitance and excellent rate performance. However, specific capacitance larger than the theoretical limit of the composite was frequently reported for PANI/graphene composites, and the reason for this over-high capacitance has not been understood. In this work, after systematically investigating the evolution of electrochemical and spectral properties of PANI/graphene, we prove that the hydroxyl or amino terminated oligoanilines generated from degradation of PANI possess large specific capacitance (> 1000 F g−1), and they significantly increase the total specific capacitance of the composite electrode. Graphene in the composite serves as a conductive matrix for the electron transport between the lowly-conductive hydroxyl or amino terminated oligoanilines and the current collector. Based on the above results, we put forward a suggestion for simultaneously improving the specific capacitance and cycling stability of the PANI/graphene composites. A PANI/reduced graphene oxide composite material with specific capacitance of 772 F g−1 at 1.05 A g−1 and 91.7% capacitance retention after 10000 cycles is obtained.

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Supplementary files

Publication details

The article was received on 20 Jul 2017, accepted on 11 Sep 2017 and first published on 13 Sep 2017


Article type: Paper
DOI: 10.1039/C7EE02018J
Citation: Energy Environ. Sci., 2017, Accepted Manuscript
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    Degradation-induced Capacitance: A New Insight into the Superior Capacitive Performance of Polyaniline/Graphene Composites

    Q. Zhang, A. Zhou, J. Wang, J. Wu and H. Bai, Energy Environ. Sci., 2017, Accepted Manuscript , DOI: 10.1039/C7EE02018J

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