Abstract
Homogeneous platinum-rhodium, palladium-rhodium and palladium-gold alloy surfaces display composite hydrogen and oxygen electrosorption properties. The potential of the oxygen desorption peak on a voltammogram varies linearly with surface composition. This relationship presents a method for analyzing the alloy surface. The dissimilarity between the electrosorption behaviour of these homogeneous alloys with heterogeneous systems can be used to detect phase separation at the surface. Changes in surface composition during continuous potential cycling are due to the preferential dissolution of a component metal. Comparison of the change in electrosorption properties with the amount of metal dissolved leads to the conclusion that the “surface” involved in chemisorption reactions consists of no more than a few atomic layers. This result is discussed in relation to theories of chemisorption and catalysis.
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