Abstract
Electrochemical studies on the palladium-hydrogen system are described. The objective was to extend the potentiodynamic method, used so far with compact electrodes, to powder catalysts. The palladium catalyst was prepared by reduction with hydrogen, formic acid, formaldehyde, or sodium borohydride. The amount and nature of hydrogen sorbed on the catalyst was studied using galvanostatic and potentiodynamic methods, in various electrolytes. By selecting appropriate conditions of sample weight and rate of potential change, potentiodynamic measurements were extended to the dissolved hydrogen range hitherto uninvestigated on palladium. It is shown that the shape of the potentiodynamic curves and the number of hydrogen maxima depend on the age of the catalyst and on the electrolyte. The mode of catalyst preparation affects the ratio of adsorbed and dissolved hydrogen but has no effect on the position and shape of the characteristic peaks.
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