Silver/Silver Chloride Electrodes: Surface Morphology on Charging and Discharging.
Technical rept. 26 Apr 73-1 Jul 73,
LOCKHEED MISSILES AND SPACE CO INC PALO ALTO CALIF PALO ALTO RESEARCH LAB
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Transport modes were determined from examinations of morphology for electrochemical oxidation and reduction within electrodes consisting of beds of silver spheres 37.2 micrometers in diameter in 1 N KCl and subjected to 5.0 mAsq cm applied current density. Oxidation proceeded via silver dissolution, probably at dislocation sites, followed by diffusion and, then, deposition of AgCl in characteristic, bulbed mounds which grow together to form layers of approximately uniform thickness. AgCl film thickness, for the case of partially covered underlying silver, was about 3,500 Angstroms, and distance from silver dissolution pits to AgCl deposition sites was found to be increased, from 4,000 to 40,000 Angstroms, as the local transfer current density became larger within the sphere bed. Reduction of anodically formed AgCl on partially covered silver proceeded by an opposite path solution and diffusion of AgCl, and deposition of silver on preferred sites of surrounding bare silver surface. Author
- Physical Chemistry