Characterization of the Capacitance of a Rotating Ring–Disk Electrode

Kovács, Noémi and Zsélyné Ujvári, Mária and Láng, Győző and Broekmann, Peter and Vesztergom, Soma (2015) Characterization of the Capacitance of a Rotating Ring–Disk Electrode. INSTRUMENTATION SCIENCE & TECHNOLOGY, 43 (6). pp. 633-648. ISSN 1073-9149

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Abstract

ABSTRACTThe 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.

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