Abstract
Complex admittance measurements of electrochemical cells of the type Pb|PbCl2|M (M=Pt, C) have been performed in the frequency range 0.1 Hz to 1 kHz, and in the temperature range 380 to 530 K. The M|PbCl2 interfaces can be represented by a parallel combination of a capacitance, a resistance, and a diffusional impedance. Different theoretical models for the interface capacitance are reviewed. The observed, nearly voltage-independent capacitance is ascribed to an inner-layer capacitance. The resistance is strongly correlated to the deposition voltage. Possible origins of the diffusion process are considered; diffusion of neutral crystal components within the electrode material or diffusion of electronic charge carriers within the electrolyte is ruled out.
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