Artículos de revistas
Estudo da eletrocristalização de Ni e Ni-P sobre ultramicroeletrodo de platina
Fecha
2008Registro en:
Química Nova, v.31, n.5, p.1150-1155, 2008
0100-4042
10.1590/S0100-40422008000500042
Autor
EGUILUZ, Katlin Ivon Barrios
AVACA, Luis Alberto
BARIN, Cláudia Smaniotto
Institución
Resumen
This work describes a comparative study of the electrocrystallization of Ni and Ni-P on Pt ultramicroelectrodes using chronoamperometric measurements. It was possible to confirm that in all cases a progressive nucleation was the predominant mechanism. Moreover, the application of the Atomistic Theory to the experimental rate of nuclei formation showed that the number of atoms in the critical nucleus was zero, except for Ni-P on Pt at low overpotentials were a value of one was observed. Furthermore, the physical characterisation of the different deposits on Pt by atomic force microscopy allowed observing the coalescence of the hemispherical nuclei of Ni and Ni-P at t max thus confirming the results obtained from the current-time analysis.