The effect of periodic modulation on the aperiodic current in linear-scan and cyclic voltammetries

The modulation of a ramped potential applied to a voltammetric electrode evokes two responses: a quasiperiodic ‘ac’ current of the same periodicity as the modulation, and a perturbation of the underlying dc current. The latter is the subject of this article. Reasoning by analogy with an analytical r...

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Bibliographic Details
Published inJournal of electroanalytical chemistry (Lausanne, Switzerland) Vol. 516; no. 1; pp. 2 - 9
Main Authors Gavaghan, David J, Myland, Jan C, Oldham, Keith B
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 14.12.2001
Elsevier Science
Subjects
Ac voltammetry
Chemistry
Cyclic voltammetry
Electrochemistry
Exact sciences and technology
General and physical chemistry
Linear-scan voltammetry
Modulated ramps
Sawtooth-wave voltammetry
Square-wave voltammetry
Staircase voltammetry
Cyclic voltammetry
Linear-scan voltammetry
Modulated ramps
Square-wave voltammetry
Ac voltammetry
Staircase voltammetry
Sawtooth-wave voltammetry
Sawtooth
Current time characteristic
Direct current
Modulation
Square wave
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Summary:The modulation of a ramped potential applied to a voltammetric electrode evokes two responses: a quasiperiodic ‘ac’ current of the same periodicity as the modulation, and a perturbation of the underlying dc current. The latter is the subject of this article. Reasoning by analogy with an analytical result for reversible square-wave-modulated linear-potential-scan voltammetry, a sequence of credible arguments has allowed prediction of the dc current for modulations of any waveform and of any amplitude. Applications to staircase voltammetry and to modulated cyclic voltammetry are included.
ISSN:1572-6657
1873-2569
DOI:10.1016/S0022-0728(01)00659-3