Abstract
A new method for determining kinetic constants of a first-order reversible chemical reaction is proposed. It is usable for fast reactions coupled to an electrochemical reaction. The demonstration is given that by estimating the high-frequency limit of the Warburg straight-line and the value of the impedance extrapolated at infinite frequency, it is possible to compute the values of these constants. Analysis of the applicability conditions of this method is made for a thin-layer cell and its conclusions are transposed to other types of electrochemical cells. This method permits values of k up to 2ssx104 s−1 to be obtained; it complements two previously presented methods which are usable for values of k up to 160 and 400 s−1, respectively.
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