Potentiostatically deposited polypyrrole/graphene decorated nano-manganese oxide ternary film for supercapacitors

Y. S Lim, Y. P Tan, H. N Lim, N. M Huang, W. T Tan, M. A Yarmo, Chun-Yang Yin

    Research output: Contribution to journalArticle

    Abstract

    A simple method based on potentiostatic polymerization was developed for the preparation of ternary manganese oxide-based nanocomposite films. The ternary nanocomposites, which were characterized using x-ray diffraction spectroscopy and x-ray photoelectron spectroscopy, showed that the manganese oxide within the film consisted of MnO2 and Mn2O3. Electrochemical measurements showed that the ternary nanocomposite electrode exhibited high specific capacitance (up to 320.6 F/g), which was attributed to the morphology of a polypyrrole/graphene/manganese-oxide (PPy/GR/MnOx) ternary nanocomposite. The experimental approach maximized the pseudocapacitive contribution from redox-active manganese oxide (MnOx) and polypyrrole (PPy), as well as the electrochemical double layer capacitive (EDLC) characteristic from graphene (GR) sheets. Long cyclic measurements indicated that the specific capacitance of the ternary nanocomposite film could retain 93% of its initial value over 1000 charge/discharge cycles, in the potential range of −0.2 to 0.7 V versus silver/silver chloride electrode (Ag/AgCl).
    Original languageEnglish
    Pages (from-to)3855-3864
    JournalCeramics International
    Volume40
    Issue number3
    DOIs
    Publication statusPublished - 4 Apr 2014

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