RESEARCH OF ASPECTS OF MASS TRANSPORT NEAR THE THREE-PHASE ZONE OF AN OXYGEN ELECTRODE.
UNITED AIRCRAFT CORP EAST HARTFORD CONN
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An experimental and mathematical modell based upon a semi-infinite cathode covered with a thin uniform meniscus of electrolyte was used to study transport mechanisms at the oxygen cathode. Experiments employing this model showed no evidence of a significant surface migration mechanism. Effective electrochemical length to thickness ratios of the meniscus ranged from 3000 to 10000. Theoretical diffusion transport based upon these values was shown to account for observed cathode performance. The oxygen sorption rate constant on platinum in caustic media was found to be ca. 0.000049 cmsec. The experiments indicate that significant sorption rate limitation may exist in the cathodic reduction of oxygen. Machine solutions were performed based upon a mathematical model involving mass transport by diffusion and migration and explicit rate limitation by sorption processes.