Electrochemical quartz crystal microbalance study of formation and redox transformations of poly(diphenylamine)

K. Fehér, G. Inzelt

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

The electropolymerization of diphenylamine (DPA) dissolved in 2 mol dm-3 H2SO4 has been studied on a gold electrode by cyclic electrochemical quartz crystal microbalance measurements. Similar experiments have been accomplished with DPA microcrystals attached to a gold electrode, in the presence of aqueous acidic media. In both cases the redox transformations of the poly(diphenylamine) films formed on Au have been investigated in solutions of different pHs. The cyclic voltammograms and the mass changes refer to two closely spaced redox reactions resulting in the formation of cation radicals and dications, respectively. The irregular, broad shape of the voltammetric waves may be explained by presence of other electrochemically active sites beside the linear diphenylbenzidine structure. The results indicate a pH and potential-dependent relative contribution of anions and hydrogen ions to the overall ion exchange process. The expulsion of protons is the predominant ion transport process at the beginning of the oxidation and the incorporation of anions occurs at a later stage of oxidation. The sorption/desorption of solvent molecules also contributes to the mass change observed during the redox transformations of the polymer.

Original languageEnglish
Pages (from-to)3551-3559
Number of pages9
JournalElectrochimica Acta
Volume47
Issue number21
DOIs
Publication statusPublished - Aug 15 2002

Fingerprint

Diphenylamine
Quartz crystal microbalances
Negative ions
Gold
Oxidation
Microcrystals
Electrodes
Anions
Electropolymerization
Protons
Redox reactions
Ions
Sorption
Desorption
Ion exchange
Positive ions
Hydrogen
Molecules
Cations
Polymers

Keywords

  • Diphenylamine
  • Electrochemical quartz crystal microbalance
  • Electropolymerization
  • Microcrystals

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Analytical Chemistry
  • Electrochemistry

Cite this

Electrochemical quartz crystal microbalance study of formation and redox transformations of poly(diphenylamine). / Fehér, K.; Inzelt, G.

In: Electrochimica Acta, Vol. 47, No. 21, 15.08.2002, p. 3551-3559.

Research output: Contribution to journalArticle

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