On-line FFT faradaic admittance measurements application to A.C. cyclic voltammetry

Alan M. Bond, Richard J. Schwall, Donald E. Smith

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31 Citations (Scopus)

Abstract

A measurement approach is described and data are presented which demonstrate the ability to effect a.c. cyclic voltammetric measurements with the on-line digital FFT approach to faradaic admittance data acquisition. The equipment utilized enables complete faradaic admittance spectra to be obtained at an effective spectrum acquisition rate of 10 s-1, so that the d.c. potential range encompassed by a typical cyclic wave can be encompassed with adequate resolution in the Edc dimension in ≥6 s, approximately. The instrument features dynamic, computerized measurement and compensation of the non-faradaic ohmic resistance and double-layer capacitance contributions to the acquired total cell admittance. Measurements with quasi-reversible systems yield the expected faradaic admittance and phase angle responses over a quite generous bandwidth. Applications to mercury and platinum electrodes are illustrated.

Original languageEnglish
Pages (from-to)231-247
Number of pages17
JournalJournal of Electroanalytical Chemistry
Volume85
Issue number2
DOIs
Publication statusPublished - 23 Dec 1977
Externally publishedYes

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