Characterization of the Capacitance of a Rotating Ring–Disk Electrode

Kovács, Noémi; Ujvári, Mária; Láng, Győző G.; Broekmann, Peter; Vesztergom, Soma (2015). Characterization of the Capacitance of a Rotating Ring–Disk Electrode. Instrumentation Science and Technology, 43(6), pp. 633-648. Taylor & Francis 10.1080/10739149.2015.1038561

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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.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Broekmann, Peter and Vesztergom, Soma

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 540 Chemistry
500 Science

ISSN:

1073-9149

Publisher:

Taylor & Francis

Language:

English

Submitter:

Beatrice Niederhauser

Date Deposited:

02 Feb 2016 16:24

Last Modified:

02 Feb 2016 16:24

Publisher DOI:

10.1080/10739149.2015.1038561

URI:

https://boris.unibe.ch/id/eprint/75076

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