The Lead Anode in Alkaline Solutions: I . The Initial Oxidation Processes

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Abstract
The initial reactions occurring at a Pb anode in alkaline solutions have been investigated using cyclic voltammetry and steady‐state and transient potentiostatic methodologies. It has been found that the first step in the reaction is the formation of a surface intermediate, followed by the deposition of a thin film on the Pb surface. A major portion of this film dissolves to form and the measured Tafel slope of 27 mV/decade of current density is consistent with the dissolution step being the rate‐determining step. With the use of the rotating ring disk electrode technique, in which the disk current is separated into that due to the formation of an insoluble surface product and that due to a dissolution reaction, it was found that some of the film dehydrates to form a thin film. At more positive potentials, further film growth occurs, but by a nucleation and growth mechanism.

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