Characterization of the Capacitance of a Rotating Ring-Disk Electrode

Noémi Kovács, Mária Ujvári, Gyozo G. Láng, Peter Broekmann, Soma Vesztergom

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The use of rotating ring-disk electrodes as generator-collector systems has so far been limited to the detection of Faradaic currents at the ring. As opposed to other generator-collector configurations, non-Faradaic detection has not yet been carried out with rotating ring-disk electrodes. In this study, a.c. perturbation based detection for measurement of the ring impedance is introduced. By using a conducting polymer-modified disk electrode in combination with a bare gold ring as a model, it is shown that the measured ring capacitance correlates with the polarization of the polymer film, most probably due to counter-ion exchange. A method of calculating the ring capacitance based on a small-signal sinusoid perturbation is described and the most important instrumental limitations are identified.

Original languageEnglish
Pages (from-to)633-648
Number of pages16
JournalInstrumentation Science and Technology
Volume43
Issue number6
DOIs
Publication statusPublished - Nov 2 2015

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Keywords

  • capacitance measurements
  • generator-collector systems
  • poly(3,4-ethyleneclioxythiophene)
  • sine-wave correlation

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Instrumentation
  • Environmental Science(all)

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