Hyphenated in situ conductance and spectroelectrochemical studies of polyaniline films in strongly acidic solutions

Péter S. Tóth, Gergely F. Samu, Balázs Endrodi, C. Visy

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The redox transformations of polyaniline (PANI) have been studied in acidic solutions of pH <1 by in situ optical electrochemistry and in situ ac conductance technique applied both separately and by using them in a hyphenated mode. For the combination of the two in situ electrochemical techniques, thin layers have been deposited on a special double-band ITO electrode (dbITO), with a gap of 15 μm. The structure of the dbITO printed circuit electrode made possible to monitor simultaneously the electrochemical, the optical and the conductance changes during the redox processes, occurring in the self-same film. Spectral features confirmed the existence of protonated segments in the reduced film, formed in these strongly acidic media, assumingly via the proton partition at the reduced film/solution interface, coupled also with anion uptake to fulfil electroneutrality. The simultaneous in situ spectral and ac conductance data gave evidence that the development of the conducting state starts only with the oxidative transformation of emeraldine type radical cations coupled with anion entry, leading to the increase in the quinoid/benzonoid ratio in the charge carriers.

Original languageEnglish
Pages (from-to)446-451
Number of pages6
JournalElectrochimica Acta
Volume110
DOIs
Publication statusPublished - 2013

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Polyaniline
Electrodes
Anions
Negative ions
Printed circuits
Electrochemistry
Charge carriers
Cations
Protons
Positive ions
polyaniline
Oxidation-Reduction

Keywords

  • In situ conductance
  • In situ spectroelectrochemistry
  • Polyaniline
  • Redox transformation

ASJC Scopus subject areas

  • Electrochemistry
  • Chemical Engineering(all)

Cite this

Hyphenated in situ conductance and spectroelectrochemical studies of polyaniline films in strongly acidic solutions. / Tóth, Péter S.; Samu, Gergely F.; Endrodi, Balázs; Visy, C.

In: Electrochimica Acta, Vol. 110, 2013, p. 446-451.

Research output: Contribution to journalArticle

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AU - Visy, C.

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N2 - The redox transformations of polyaniline (PANI) have been studied in acidic solutions of pH <1 by in situ optical electrochemistry and in situ ac conductance technique applied both separately and by using them in a hyphenated mode. For the combination of the two in situ electrochemical techniques, thin layers have been deposited on a special double-band ITO electrode (dbITO), with a gap of 15 μm. The structure of the dbITO printed circuit electrode made possible to monitor simultaneously the electrochemical, the optical and the conductance changes during the redox processes, occurring in the self-same film. Spectral features confirmed the existence of protonated segments in the reduced film, formed in these strongly acidic media, assumingly via the proton partition at the reduced film/solution interface, coupled also with anion uptake to fulfil electroneutrality. The simultaneous in situ spectral and ac conductance data gave evidence that the development of the conducting state starts only with the oxidative transformation of emeraldine type radical cations coupled with anion entry, leading to the increase in the quinoid/benzonoid ratio in the charge carriers.

AB - The redox transformations of polyaniline (PANI) have been studied in acidic solutions of pH <1 by in situ optical electrochemistry and in situ ac conductance technique applied both separately and by using them in a hyphenated mode. For the combination of the two in situ electrochemical techniques, thin layers have been deposited on a special double-band ITO electrode (dbITO), with a gap of 15 μm. The structure of the dbITO printed circuit electrode made possible to monitor simultaneously the electrochemical, the optical and the conductance changes during the redox processes, occurring in the self-same film. Spectral features confirmed the existence of protonated segments in the reduced film, formed in these strongly acidic media, assumingly via the proton partition at the reduced film/solution interface, coupled also with anion uptake to fulfil electroneutrality. The simultaneous in situ spectral and ac conductance data gave evidence that the development of the conducting state starts only with the oxidative transformation of emeraldine type radical cations coupled with anion entry, leading to the increase in the quinoid/benzonoid ratio in the charge carriers.

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