Harmonic impedance spectroscopy. Theory and experimental results for reversible and quasi-reversible redox systems

Danny K.Y. Wong, Douglas R. MacFarlane

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Theoretical equations are developed for the second and higher harmonic responses of reversible and quasireversible redox reactions to an applied sinusoidal waveform as a function of frequency. Finite layer diffusion is taken into account in the theoretical development in order to describe the low-frequency response appropriately. The description is considerably simplified by the definition of a harmonic impedance function. Experimental results are presented for the redox systems ferrocene/ferricinium ion in tetraethylammonium perchlorate and ferrocyanide/ferricyanide in aqueous potassium chloride and are compared quantitatively with the theoretical results.

Original languageEnglish
Pages (from-to)2134-2142
Number of pages9
JournalJournal of Physical Chemistry
Issue number7
Publication statusPublished - 1 Jan 1995

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