engleski

Application of Carbon Fibre Microelectrodes in Electrochemical Investigations

In this work, the electrocrystallization of nickel from Ni^2+ acidic bath has been investigated using an assembly of carbon fiber microelectrodes, consisting of single and multi microdiscs randomly distributed inside the matrix of a non-conducting polymer. The microdiscs were far enough apart that the crystals could not interact, thus limiting the total observed current density to a linear superposition of the current densities from each crystal considered independentely. the current- time transients response was quantitatively evaluated using Scharifker ang hills nucleation model. The high rate of nucleation after a rapid increase in the overpotentials was discussed in relation to the physical model for three- dimensional nucleation with diffusion-controlled growth. Excellent agreement between the experimental results and the theoretical curve for 3D progressive nucleation was obtained.

Ni ; electrocrystallization ; carbon fiber microelectrode ; 3D progressive nucleation with diffusion-controlled growth

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