Abstract
Impedance measurements are used to investigate anodic films on nickel at the limiting current in a concentrated lithium chloride solution. An equivalent circuit is derived by describing the electrochemical system as being a metal electrode covered by a compact layer itself covered by a looser salt film. This model is based on the assumption that the electrochemical reaction occurs at the metal-layer interface and that the compact layer has semiconducting properties. The component values of the equivalent circuit are determined from experimental impedance data using a least-squares algorithm. These values are in agreement with the presence of a depletion layer inside the compact layer through wich metallic ions transfer under high-field conduction.
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