Abstract
Palladium was deposited galvanostatically and potentiostatically from complex chloride solutions at various cds and potentials. The properties of the deposits were studied by a number of methods. The roughness measured with a mechanical profilometer strongly increased upon reaching the limiting cd in agreement with the general theory of the influence of mass transport control on the electrodeposition of metals. The particle size of the Pd-powders obtained above the limiting cd decreased steadily with increasing current density of deposition. In contrast to this, the BET- surface area as well as the catalytic activity (determined by measuring the acceleration of the rate of hydrogenation of cyclohexene) went through a maximum. The latter occurs in the region where the deposit consists of both the α and β H-Pd phases. The metal was deposited on a Pd-electrode as well as on a suspension of active carbon. The maximum catalytic activity was in both cases comparable to that of a non-electrolytic Pd-test catalyst.
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