Oxidation of a PPy‐modified tantalum electrode

Young‐Seo ‐S Park, Kimihisa Yamamoto, Shinji Takeoka, Tomoyuki Ohta, Eishun Tsuchida

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    Abstract

    A tantalum electrode on which polypyrrole (PPy) had been previously formed by electropolymerization was galvanostatically electrolyzed in an aqueous solution of 0.01 wt% phosphoric acid. This process contains the irreversible oxidation of a PPy film, the decomposition of solvent, and the formation of Ta2O5 by the reaction of OH coming through the PPy film, with Ta electrodes. A three layer‐structure (PPy/Ta2O5/Ta) was confirmed by electron spectroscopy for chemical analysis (ESCA). A PPy film containing CIO4 as dopant [PPy(CIO4 )] was significantly deteriorated in comparison with PPy(TsO) at the electrolysis. Therefore, the (PPy(TsO)/Ta2O5/Ta) system showed better electrical characteristics as a capacitor than the (PPy(CIO4 )/Ta2O5/Ta) system showed better electrical characteristics as a capacitor than the (PPy(ClO4 )/Ta2O5/Ta) system.

    Original languageEnglish
    Pages (from-to)329-334
    Number of pages6
    JournalPolymers for Advanced Technologies
    Volume4
    Issue number5
    DOIs
    Publication statusPublished - 1993

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    Keywords

    • Capacitor
    • Electropolymerization
    • Galvanostatic electrolysis
    • Polypyrrole
    • Tantalum oxide

    ASJC Scopus subject areas

    • Polymers and Plastics

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