Voltametrie a tension lineairement variable, en couche mince rigide: I. L'oxydation de l'hydrogene dissous dans une couche mince de palladium, en solution agitee

Abstract

As a result of the difficulties arising in the mathematical treatment of linear sweep voltammetry in a thin rigid layer (oxidation of hydrogen dissolved in palladium in a stirred solution) it is not possible to obtain an analytical solution to this problem. An analogue computer was therefore used; the circuit and the results obtained are described. Further, it is shown that the computer, in fact, plays the part of an electronic model of the phenomenon being studied and allows the use of eriments on the model for the study of the influence of various physical parameters on the current-time curve. This method is particularly useful because it can be modified easily and rapidly over a wide range of the numerical data. With its aid, it has been established that the speed of the quasi-reversible oxidation of hydrogen dissolved in palladium by linear sweep voltammetry under conditions where control by diffusion in the solution is negligible, is independent of ks and α., The maximum value of the current depends linearly on the initial concentration, c 1 0, and on the square root of the rate of the potential sweep.