Kinetical study of the cobalt electrodeposition onto glassy carbon electrode from ammonium sulfate solutions. C.H. Rios-Reyes, M. Granados-Neri and L.H. Mendoza-Huizar. Quim. Nova, Vol. 32, No. 9, 2382-2386, 2009 ISSN . 0100-4042
We carried out an electrochemical study of the cobalt electrodeposition onto glassy carbon electrode from an aqueous solution containing 10-2 M of CoSO4 + 1 M (NH4)2SO4 at natural pH 4.5. The potentiostatic study indicated a progressive 3D nucleation and growth during the deposition process. The average diffusion coefficient calculated for this system was 2.65 X 10-6 cm2 s-1 while the ?G for the formation of stable nucleus was 6.50 X 10-20 J/nuclei. The scanning electron microscopy images indicated the formation of small and homogeneous nucleus onto GCE of approximately 300 nm.