Abstract
AbstractDouble layer capacity of evaporated silver film electrodes was studied as a function of potential and of time in solutions containing different strongly adsorbable species. The potential regime of specific adsorption of chloride, cyanide, thiocyanate, and sulfide ions is determined. From the time dependence of the double layer capacitance as well as from electron micrographs, it can be deduced that surface migration takes place which leads to a flattening of the surface. In the case of sulfide and thiocyanate ions an additional process leads to a marked decrease in the capacity, which at the same time becomes nearly potential independent. This observation is attributed to the formation of an adsorbed layer of complexes.
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