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Issue 11, 2017
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Degradation-induced capacitance: a new insight into the superior capacitive performance of polyaniline/graphene composites

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Abstract

Polyaniline/graphene (PANI/graphene) composites are the most investigated electrode materials for supercapacitors, owing to their high specific capacitance and excellent rate performance. However, a specific capacitance larger than the theoretical limit of the composite has been 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 the electrochemical and spectral properties of PANI/graphene, we prove that the hydroxyl- or amino-terminated oligoanilines generated from degradation of PANI possess a 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 electron transport between the low-conductivity 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 a specific capacitance of 719 F g−1 at 1.4 A g−1 and 91.3% capacitance retention after 10 000 cycles is obtained.

Graphical abstract: Degradation-induced capacitance: a new insight into the superior capacitive performance of polyaniline/graphene composites

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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., 2017,10, 2372-2382
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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, 10, 2372
    DOI: 10.1039/C7EE02018J

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