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Hydrothermal direct synthesis of polyaniline, graphene/polyaniline and N-doped graphene/polyaniline hydrogels for high performance flexible supercapacitors

Abstract

Electroactive hydrogels have been considered as flexible solid-state supercapacitor electrode materials. Herein, a novel strategy has been proposed to directly prepare polyaniline (PANI) hydrogels from soluble PANI dispersion by self-crosslinking of molecules in hydrothermal process. The PANI hydrogel single-electrode shows high specific capacitance (325 F g-1) and superior rate capability. To achieve more excellent electrochemical performance, the graphene/PANI hydrogel (GPH7) is prepared using graphene oxide (GO) and soluble PANI dispersion. However, a slightly enhanced specific capacitance (375 F g-1) is achieved for GPH7 single-electrode, due to the strong interactions between GO and PANI molecules. It is of particular interest that the incorporation of m-Phenylenediamine (mPD) into the GO and PANI system could protect the inherent conjugated structure of PANI, thereby the as-prepared N-doped graphene/PANI hydrogels (GMPH7) show significantly improved specific capacitance (514.3 F g-1). Moreover, the assembled flexible solid-state supercapacitor based on PANI hydrogel, GPH7 and GMPH7 exhibits excellent areal specific capacitance (484, 519.2 and 584.7 mF cm-2, respectively), approximately 100% capacitance retention after 2000 mechanical bending cycles and favorable energy density (42.96, 60.9 and 81.28 μWh cm-2, respectively). Such hydrogel assembled supercapacitors with robust capacitive behavior and outstanding flexibility are promising for applications in flexible and wearable electronics.

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Publication details

The article was received on 08 Feb 2018, accepted on 15 Apr 2018 and first published on 16 Apr 2018


Article type: Paper
DOI: 10.1039/C8TA01366G
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Hydrothermal direct synthesis of polyaniline, graphene/polyaniline and N-doped graphene/polyaniline hydrogels for high performance flexible supercapacitors

    Y. Zou, Z. Zhang, W. Zhong and W. Yang, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA01366G

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