Cobalt electrodeposition onto polycrystalline gold from ammoniacal solutions |
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| Authors: | Luis H Mendoza-Huizar Clara H Rios-Reyes |
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| Institution: | 1. Academic Area of Chemistry, Autonomous University of Hidalgo State, CP. 42186 Mineral de la Reforma, Hidalgo, Mexico
2. Academic Academic Area of Earth Sciences and Materials, Autonomous University of Hidalgo State, CP. 42186 Mineral de la Reforma, Hidalgo, Mexico
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| Abstract: | In the present work, the cobalt electrodeposition onto polycrystalline gold electrodes from aqueous solutions containing 0.01M CoSO4 + 1 M (NH4)2SO4 at pH=7 was analyzed. Linear voltammetry results suggested a change in the kinetic of the cobalt electrodeposition. In all cases, the nucleation rate (A), the number of active nucleation sites (N 0) and the saturation number of nuclei (N s ) values were potential dependent. The calculated Gibbs free energy (ΔG) for this system was 1.88×10?20 J nuclei?1 and the transfer coefficient for the Hydrogen Electroreduction Reaction (HER) was 0.47.  | |
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