Ion- and Electron Transport in Pyrrole/Quinone Conducting Redox Polymers Investigated by in Situ Conductivity Methods

Christoffer Karlsson, Hao Huang, Maria Strømme, Adolf Gogoll, Martin Sjödin

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Polypyrrole functionalized with redox active pendant groups constitutes a so called conducting redox polymer, and functions both as a conducting polymer and as a redox polymer. The electrochemical response reveals capacitive charging of the conducting backbone as well as redox cycling of the pendant groups. While the backbone provides an electrically conducting matrix for fast electron transport through the material, the pendant groups offer a large charge storage capacity, much greater than that of polypyrrole itself. We have investigated such polypyrrole-hydroquinone conducting redox polymers, with focus on their in situ conductivity during electrochemical cycling, in order to understand the charge transport mechanisms in this type of system. The most notable feature is that oxidation of the pendant groups leads to a large decrease in the polymer conductivity. The causes of this phenomenon are discussed, as well as the rate limitations of fast redox cycling of the polymer, which are investigated through a combination of bipotentiostat cyclic voltammetry and potential steps of polymer films on interdigitated array electrodes.

Original languageEnglish
Pages (from-to)336-342
Number of pages7
JournalElectrochimica Acta
Volume179
DOIs
Publication statusPublished - 2015 Oct 10
Externally publishedYes

Keywords

  • conducting polymers
  • In situ conductivity
  • polypyrrole
  • rate limitations
  • redox polymers

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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