Multiwall carbon nanotube-poly(4-styrenesulfonic acid) supported polypyrrole/manganese oxide nano-composites for high performance electrochemical electrodes

    Authors

    R. K. Sharma; A. Karakoti; S. Seal;L. Zhai

    Comments

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    Abbreviated Journal Title

    J. Power Sources

    Keywords

    Supercapacitor; Rate capability; Polypyrrole; MnO(2) electrochemical; electrode; MANGANESE OXIDE; SUPERCAPACITORS; ELECTROCHROMISM; CAPACITANCE; DEPOSITION; STORAGE; FILMS; MNO2; Electrochemistry; Energy & Fuels

    Abstract

    Poly(4-styrenesulfonic acid) (PSS) dispersed multiwall carbon nanotubes (MWCNTs) are used as a support for polypyrrole (PPy)/MnO(2) in a supercapacitor electrode. Synergetic interaction between polypyrrole and MnO(2) significantly improves the electrical properties and the mechanical stability of the electrode that yields high rate capability. The (-SO(3)(-)) Surface functionalities on MWCNT-PSS facilitate an ordered growth, and the molecular level dispersion of MnO(2) in PPy matrix enhances the electrode performance. As an electrochemical electrode the MWCNT-PSS/PPy:MnO(2) nano-composite exhibits similar to 268 F g(-1) specific capacitance at 5 mV s(-1). The excellent rate capability and stability of the electrode is demonstrated by only 7% fade in the specific capacity at 100 mV s(-1) (compared to the available capacity at 5 mV s(-1))and 10% fade in the same after 5000 CV cycles. Specific capacitance of PPy:MnO(2) component in the nano-composite is as high as 412 F g(-1) in 0.5 M Na(2)SO(4) electrolyte. Electrical conductivity of the MWCNT-PSS/PPy nanocomposite is significantly improved upon inclusion of MnO(2) in molecular level dispersion. (C) 2009 Elsevier B.V. All rights reserved.

    Journal Title

    Journal of Power Sources

    Volume

    195

    Issue/Number

    4

    Publication Date

    1-1-2010

    Document Type

    Article

    Language

    English

    First Page

    1256

    Last Page

    1262

    WOS Identifier

    WOS:000271779100050

    ISSN

    0378-7753

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