4.3 Article

Studies on the formation and properties of polypyrrole doped with ionised -cyclodextrins: influence of the anionic pendants

期刊

JOURNAL OF SOLID STATE ELECTROCHEMISTRY
卷 23, 期 2, 页码 615-626

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SPRINGER
DOI: 10.1007/s10008-018-04171-8

关键词

Polypyrrole; Sulfonated -cyclodextrin; Carboxymethyl -cyclodextrins; Cation exchange

资金

  1. Irish Research Council for Science, Engineering and Technology (IRCSET) Ireland
  2. Science Foundation Ireland (SFI)

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Polypyrrole films doped with sulfonated -cyclodextrin (PPy/s-CD) and carboxymethyl -cyclodextrin (PPy/CM-CD) were formed on electropolymerisation of pyrrole in a solution of the cyclodextrin sodium salts. Lower rates of electropolymerisation were evident with the carboxymethyl -CD and this was attributed to protonation of the carboxylate groups due to an increase in the interfacial pH at the electrode-solution interface. The PPy/s-CD and PPy/CM-CD films showed cation exchange behaviour with the ingress of Na+ and its associated water molecules on reduction. The PPy/CM-CD film showed less electroactive behaviour which may be related to the lower number of anionic pendants on the CM-CD or to the possible precipitation of the less soluble neutral CD which arises due to the protonation of the carboxylate groups. The PPy/s-CD showed a high capacitance of 6.0mFcm(-2) corresponding to a specific capacitance of 71Fg(-1) over a wide potential range extending from -0.60 to 0.60V vs SCE. Over-oxidation was observed at relatively low potentials, at about 0.60V vs SCE. A diffusion coefficient of 6.47x10(-6)cm(2)s(-1) and a rate constant of 3.73x10(-2)cms(-1) were obtained for the ferricyanide redox couple at the PPy/s-CD, indicating little or no inhibition of the ferricyanide redox reaction.

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