Electroreduction kinetics and mechanism of palladium(II) glycinate chloride complexes on rotating palladium disk electrode |
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Authors: | T. G. Nikiforova V. I. Kravtsov M. E. Kozelkova |
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Affiliation: | 1.Saint Petersburg State University,Saint Petersburg,Russia |
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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 I d, 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/(I d − I)]. The slope of this line gave b k factor evidencing the slow electrochemical step. When [Cl−] decreased from 1 to 0.2 M, E 1/2 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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