Colloque

The Significance of Electrode Capacitance in E.M.F. Decay Processes

B. E. Conway

P.-L. Bourgault

Membre a labase

B. E. Conway

Résumé du colloque

The significance of observations of rates of E.M.F.-decay on open-circuit at the nickel oxide electrode is examined in terms of the potential dependence of the surface capacitance associated with the processes occurring during decay. Determinations of volumes of oxygen evolved from the electrode during open-circuit E.M.F.-decay allow quantitative comparisons to be made between true Tafel slopes and open-circuit E.M.F. decay slopes. These slopes are shown to be identical only when the volume of oxygen evolved from the surface is a linear function of E.M.F. When the E.M.F. is a logarithmic function of the oxygen evolved, Tafel and decay slopes are shown to differ in the theoretically expected direction. These two cases correspond to potential independent and potential dependent electrode capacities, respectively.

Contexte

Section :

Chimie physique

Thème du colloque :

Chimie physique

Responsables :

P.A. Giguère L. Ouellet

Hôte : Université d’Ottawa

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