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The galvanostatic single-pulse and the coulostatic impulse methods for the determination of the rate constants of electrode reactions

By D.J. Kooijman and J.H. Sluyters

Abstract

The information on kinetic parameters of electrode reactions obtained with the galvanostatic single-step, the coulostatic impulse and the faradaic impedance methods is examined as a function of the applied electrolysis time and the ac frequency. A time and a frequency condition is given for which the information on kinetics obtainable with these methods is maximal. In the usual approach to the single-step and the coulostatic impulse methods these optimal conditions cannot be met. We present here a new procedure with which the experimental data measured with both methods can be interpreted exactly over the whole region of the η/t curve by means of numerical tables. The application of these tables enhances the limit of the applicability of the single-step method by a factor of 3 and that of the coulostatic impulse method by a factor of 100. The methods are applied to the Cd2+/Cd (Hg)-electrode in 1 M NaClO4 and the Hg22+/ Hg electrode in 1 M HClO4

Topics: Scheikunde
Year: 1967
OAI identifier: oai:dspace.library.uu.nl:1874/15669
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