Demonstration of Superiority of the Marcus-Hush Electrode Kinetic Model in the Electrochemistry of Dissolved Decamethylferrocene at a Gold Modified Electrode by Fourier Transformed Alternating Current Voltammetry

Jiezhen Li, Gareth F Kennedy, Alan M Bond, Jie Zhang

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6 Citations (Scopus)

Abstract

Fourier-transformed alternating current (AC) voltammetry is used to compare the applicability of the Butler-Volmer (BV) and Marcus-Hush (MH) models of electrode kinetics (k0) to an outer-sphere electrode process where both oxidized and reduced species are soluble. According to numerical simulations, differences between the two models can be revealed clearly by analysis of the AC harmonics when the values of k0 and reorganization energy are sufficiently small. Experimentally a Au electrode coated with a self-assembled octanethiol monolayer was introduced to decrease the rate of the DmFc0/+ (DmFc = decamethylferrocene) process, a well-known outer-sphere process in a propylene carbonate solution containing 0.10 M tetrapropylammonium tetrafluoroborate. Based on a comparison of the computationally generated best fits, it was demonstrated that the MH model provides substantially better agreement with the experimental data than the BV model for the DmFc0/+ process, unlike some other examples in the literature that favor the BV model.

Original languageEnglish
Pages (from-to)9009-9014
Number of pages6
JournalJournal of Physical Chemistry C
Volume122
Issue number16
DOIs
Publication statusPublished - 26 Apr 2018

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