Producción Científica Profesorado

The role of temperature in copper electrocrystallization in ammoniachloride solutions



Mendoza Huizar, Luis Humberto

2006

The role of temperature in copper electrocrystallization in ammoniachloride solutions. Jorge Vazquez-Arenas, Roel Cruz, Luis H. Mendoza-Huizar. http://dx.doi.org/10.1016/j.electacta.2006.06.022


Abstract


This paper presents the analysis of temperature effect on the copper electrocrystallization process from the stainless steel/Cu(II)Cu(I)NH4ClNH3H2O system. Electrochemical techniques and scanning electron microscopy with energy dispersion spectroscopy were employed. An increment in temperature had a favorable effect in increasing the kinetic and nucleation parameters, favoring the copper reduction on the stainless steel substrate. From the chronoamperometric study, it was possible to find the transfer coefficient (?), which does not have a significant variation with temperature, and the exchange current density (i0) for different temperatures, where a 50.63 kJ/mol value was estimated for the activation energy. The potentiostatic study suggested the presence of two processes involved: an electron transfer reaction and a 3D nucleationgrowth process, under combined charge transfer and diffusion limitations. In addition, an important current contribution could be accounted for on the basis of the existence of a capacitive component in the system. This capacitive behavior was associated to the oxide layer (Cr2O3)chloride interactions on the stainless steel surface. Current transients analyses at different potentials, based on the models of: Milchev (low overpotential), ScharifkerMostany (SM) and HeermannTarallo (HT) (high overpotential) allowed to obtain the values of nucleation parameters, such as: the nucleation rate constant (A), the active nucleation sites number (N0), the stationary nucleation rate (Ist = A × N0) and the nuclei saturation number (Ns). Finally, the deposits obtained were analyzed by SEM, showing an acceptable correlation between the nucleation parameters and morphology of the deposits obtained. An increment in temperature favored the growth of the cluster before the coalescence occurred.



Producto de Investigación




Artículos relacionados

Cobalt electrodeposition on polycrystalline palladium. Influence of temperature on kinetic parameter...

Nucleation and Growth Kinetics of Electrodeposited Sulfate-Doped Polypyrrole: Determination of the D...

Synthesis and crystal structures of cis-palladium(II) and cis-platinum(II) complexes containing di...

A Semiempirical PM6 Study of Some Aminopyrimidine Derivatives and their Interaction with an Iron Sur...

Analysis of the experimental pressuretemperature behavior in the isotropicnematic phase transition f...

Bioacumulación y daños genotóxicos en Pez Cebra (Danio rerio) por arsénico en aguas de Zimapán, Hida...

Kinetics of Polypyrrole Films Doped with Sulphate Ions Electrodeposited Over Graphite - Epoxy Resin ...

Potentiometric behavior of graphite-epoxy electrochemical transducers towards anions, cations and pH...

Morphological and magnetic properties of cobalt nanoclusters electrodeposited onto HOPG

Quantum chemical study of the electrochemical reduction of the [Co(H2O)6]2+ and [Co(NH3)5(H2O)]2+ io...