A Small Signal Capacitance Model for A Metallic Electrochemical Electrode in the Charge Transfer Region | ||
| Egyptian Journal of Solids | ||
| Article 3, Volume 23, Issue 2, 2000, Pages 203-217 PDF (88.17 K) | ||
| DOI: 10.21608/ejs.2000.151730 | ||
| Abstract | ||
| 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 then 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 potentials where the reaction rate 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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