A STUDY OF THE ADSORPTION MECHANISMS ON OXYGEN ELECTRODES
Semi-annual rept. no. 1, 6 Sep-31 Dec 1962
WESTINGHOUSE RESEARCH CORP BALTIMORE MD
Pagination or Media Count:
An improved method for studying the exchange of oxygen with O18 pre- adsorbed on a metal surface is reported. Detailed information on the nature of the chemisorbed oxygen on silver and the isotopic exchange mechanism at 200 C was obtained. The rates of chemisorption and dissociation were determined, which are two distinct processes beyond a certain oxygen coverage. Oxygen pressure versus temperature characteristics and isotopic exchange reactions on carefully cleaned silver and silver-gold alloy powder surfaces are reported. The powders were all prepared by a spark erosion method. A strong increase in the exchange activity was obtained at elevated temperatures by dilution of the silver. With pure silver at room temperature a dissociative oxygen exchange was observed which decreased with time. A palladium powder of commercial origin was active only above 100 C.
- Physical Chemistry