Abstract
The electroreduction kinetics of Pd(Hgly)2Cl2 on rotating palladium disk electrode was studied by means of cyclic voltammetry. The double layer range of the palladium charging curve showed a single wave with the diffusion limited current Id, which yielded the diffusion coefficient of Pd(Hgly)2Cl2 complex D = 6 × 10−6 cm2/s. The plotted direct and reverse voltammetric curves were linearized in coordinates E, log[I/(Id − I)]. The slope of this line gave bk factor evidencing the slow electrochemical step. When [Cl−] decreased from 1 to 0.2 M, E1/2 potential shifted to positive values. This was accounted for by reversible cleavage of Cl− ion from Pd(Hgly)2Cl2 complexes before the irreversible electrochemical step. The pulse galvanostatic experiment resulted in the double electrical layer capacity and roughness factors f of electrolytic palladium deposits. The calculated values of f from 60 to 310 were attributed to adsorption of glycine particles on the electrodeposited palladium surface, which promotes to increasing number of palladium microcrystal growing centers.
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