Extraction Of A Quantitative Reaction Mechanism From Linear Sweep Voltammograms Obtained On A Rotating Disk Electrode
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E. Tourw´e, T. Breugelmans, R. Pintelon & A. Hubin
A new methodology to quantitatively determine the mass and charge transfer parameters of an electrochemical reaction is applied successfully in this work for the study of the reduction of ferricyanide to ferrocyanide at a platinum electrode, rotating at 1000 rpm. It is concluded that the reaction can be described by a simple electron transfer and the values of the charge transfer parameters are: αox = 5.00E- 01 ± 8.75E-03 , kox = 1.39E-08 ± 2.28E-09 and kred = 1.25E+00 ± 2.01E-01. 1 Introduction The aim of a kinetic study of an electrochemical reaction with a relatively simple mechanism (only mass and charge transfer steps, no adsorption, chemical reactions, etc.) is the determination of its reaction mechanism and the quantification of its kinetic charge transfer parameters (rate constants and transfer coefficients) and mass transfer parameters (diffusion coefficients). Linear sweep voltammetry (LSV) in combination with a rotating disc electrode (RDE) is a powerful technique for providing information on the mechanism and kinetics of an electrochemical reaction. Previously we set-up a statistically founded method to model an electrochemical reaction and to determine its mass and charge transfer parameters quantitatively .