Abstract
The simplifying approximation that the concentration of an electroactive species is a linear function of distance into the solution from the electrode surface is used to derive current-time relationships for controlled potential electrolysis. Relationships for thinlayer chronoamperometry, chronoamperometry with a preceding homogeneous reversible reaction and linear-sweep voltammetry are compared with existing relationships to determine the range of applicability of the approximation. The approximation is found to yield qualitatively correct results. To obtain quantitatively or near-quantitatively correct results, it is necessary to incorporate more information about the electrochemical system into the derivation than simply the usual initial and boundary conditions.
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