A kinetic study of the cobalt electrodeposition onto a carbon fiber ultramicroelectrode of 11 µm of diameter was conducted in overpotential conditions from an aqueous solution containing 0.01 M CoCl2 + 0.1 M NH4Cl. From the voltamperometric and chronoamperometric studies, it was found that the value of the diffusion coefficient is 1.2x10 -5 cm 2 s -1 . The analysis of the current density transients suggests that cobalt electrodeposition onto a carbon fiber electrode follows an instantaneous nucleation process controlled by spherical diffusion mass transport. Also, the number of active nucleation sites increases as the applied potential decreases.
A kinetic study of the Ag electrodeposition onto Pt ultramicroelectrodes of 10, 15 and 25 µm of diameter from an aqueous solution containing AgNO3 1 mM + NH4NO3 0.1 M was conducted at overpotential conditions through potentiostatic studies. The analysis of the current density transients indicates the existence of two 2D nucleation and growth processes previous to the 3D nucleation and growth process.
In the present work voltamperometric and chronoamperometric techniques were employed to study the eletrodeposition process of copper electrodeposits (CuE) onto a rotating glassy carbon electrode (RGCDE), at different rotation rates. The ability of these CuE to oxidize sodium borohydride (NaBH4) was tested by linear voltammetry. Our results suggest that increasing the rotation rate of the disk electrode does not modify appreciably the electrocatalytic properties of these CuE because they exhibit the same oxidative ability. However, the oxidation of BH4is favored when the electrode containing CuE is subjected to a constant rotation rate. Finally, a first estimate of the size of the CuE agglomerates suggests a size of 1-20 m.
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