Electrosynthesis of polypyrrole in iodide solution. Film growth, redox behaviour and potentiometric response

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    Sammanfattning

    Electrosynthesis of polypyrrole (PPy) was studied in aqueous lithium iodide solution. The electrochemical polymerization showed features of two-dimensional growth and the reaction was catalyzed by the I-2/I- couple. The potentiometric response of PPy doped with iodide (PPy(I)) was studied both in iodide solutions and solutions containing the redox couple I-2/I- with a fixed concentration ratio 0.4 but varying the initial concentration of iodide in the range 10(-5)-1.0 M. Linear, anionic response was observed in the concentration range 10(-1)-10(-3) M when only iodide species was present. However, contribution of the redox response to the overall potentiometric response increased with increasing concentration of I-2 although the concentration ration between iodine/iodide was kept constant. The influence of phosphate buffer on the electroactivity of PPy doped with iodide was also studied.
    OriginalspråkOdefinierat/okänt
    Sidor (från-till)217–225
    Antal sidor9
    TidskriftAnalytica Chimica Acta
    Volym355
    Utgåva2-3
    DOI
    StatusPublicerad - 1997
    MoE-publikationstypA1 Tidskriftsartikel-refererad

    Nyckelord

    • iodide
    • iodine
    • phosphate buffer
    • polypyrrole
    • potentiometry
    • two-dimensional growth

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