MnO2 assisted oxidative polymerization of aniline on graphene sheets: Superior nanocomposite electrodes for electrochemical supercapacitors

Marappan Sathish, Satoshi Mitani, Takaaki Tomai, Itaru Honma

研究成果: Article査読

64 被引用数 (Scopus)

抄録

Graphene-polyaniline nanocomposite electrodes have been developed via oxidative polymerization of aniline by MnO2 on a graphene surface for electrochemical supercapacitor applications. The formation mechanism of the above nanocomposite indicates that the MnO2 undergoes oxidative disintegration and results in porous polyaniline (PANI) nanofibers formation on the graphene surface. The electron microscopic (SEM and TEM) images clearly showed the presence of porous PANI nanofiber formation on the graphene-PANI nanocomposites. The XRD, SEM-EDX and TG analysis confirmed the complete removal/degradation of MnO2 during the oxidative polymerization of aniline. For comparison, graphene-PANI nanocomposites have also been prepared via conventional polymerization using (NH4)2S 2O8 as oxidant in acidic medium and the effect of carbon nanotube (CNT) addition has been studied. The electrochemical properties of different graphene-PANI nanocomposites have been investigated using galvanostatic charge-discharge, cyclic voltammetry and electrochemical impedance spectroscopy measurements. A superior supercapacitive performance (∼15 to 40% more than the reported capacitance) has been observed for the graphene-PANI nanocomposite electrode obtained via oxidative polymerization of aniline by MnO2. Addition of CNT into the graphene-PANI nanocomposite prepared via the conventional polymerization method showed improved specific capacitance and stability. Carbon nanofibers and graphite have been used as the carbon source and the effect of the carbon source on the specific capacitance has been investigated.

本文言語English
ページ(範囲)16216-16222
ページ数7
ジャーナルJournal of Materials Chemistry
21
40
DOI
出版ステータスPublished - 2011 10 28

ASJC Scopus subject areas

  • 化学 (全般)
  • 材料化学

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