Accession Number : AD0449408

Title :   REVERSIBLE OXYGEN ELECTRODES.

Descriptive Note : Quarterly rept. no. 10, 1 Apr-30 June 64,

Corporate Author : PENNSYLVANIA UNIV PHILADELPHIA

Personal Author(s) : Genshaw, M. ; Brusic, V. ; Damjanovic, A. ; Bockris, J. O M.

Report Date : 30 JUN 1964

Pagination or Media Count : 16

Abstract : Some possible mechanisms of O dissolution are reviewed and briefly discussed. The role of rotating disk electrode with a ring for discriminating between various possible mechanisms is illustrated. In the study of the catalytic activity for the reduction of O, Tafel lines on Pt, Pd, Rh, Ir, and Au electrodes and on a number of Au-Pd and Au-Pt alloy electrodes were obtained in both acid and alkaline media. At zero current density, the rest potentials correspond to those established on oxide free electrodes in oxygenated solutions. Pt, Pd, Pt rich Pt-Au, and Pd rich Pd-Au alloy electrodes showed in acid solutions Tafel slopes close to RT/F, but on Au and Au rich Pt-Au and Pd-Au alloy electrode, the slope is close to 2RT/F. It appears that the change of slope from RT/F to 2RT/F, and also the change in the activity of electrodes, occurs at alloy compositions at which no dissociative adsorption of O is expected. In alkaline solutions, Tafel slopes do not change with alloying, but there is a change in the activity of electrode occurring at the same alloy composition. (Author)

Descriptors :   *FUEL CELLS, *ELECTRODES, *ENERGY CONVERSION, *OXYGEN, REDUCTION(CHEMISTRY), CATALYSTS, GOLD, PLATINUM, PALLADIUM, RHODIUM, IRIDIUM, GOLD ALLOYS, PLATINUM ALLOYS, PALLADIUM ALLOYS, PH FACTOR, SOLUTIONS(MIXTURES), VOLTAGE, ELECTROCHEMISTRY, ADSORPTION.

Distribution Statement : APPROVED FOR PUBLIC RELEASE