A Small Signal Capacitance Model for A Metallic Electrochemical Electrode in the Charge Transfer Region

Alamoud, A.R.M.
December 2000
Egyptian Journal of Solids;2000, Vol. 23 Issue 2, p203
Academic Journal
In this paper a small signal capacitance model for an electrochemical electrode is developed. This model takes into consideration the conventional Helmholtz layer and diffusion layer capacitances in addition to the capacitance of a homogeneous middle layer between the two previous layers. The small signal capacitance calculated by this model increases with the electrode potential reaching a maximum at certain specific voltage and decreases in qualitative agreement with the measured C-V curve By quantitative comparison of the theoretical and experimental C-V curves satisfactory agreement was found at the lower potentials.. At the higher potential where the reaction raw is appreciable the measured capacitance is smaller than the theoretical one. This is attributed to the formation of gas bubbles leading to a continuous decrease of electrode area with increased reaction rate.


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