Producción Científica Profesorado

Cobalt electrodeposition onto highly oriented pyrolytic graphite (HOPG) electrode from ammonium sulfate solutions



Mendoza Huizar, Luis Humberto

2010

Cobalt electrodeposition onto HOPG electrode from ammonium sulfate solutions. Luis Humberto Mendoza-Huizar, Clara Hilda Rios-Reyes and Margarita Rivera. Quim. Nova, ISSN . 0100-4042. Vol. 33 No.5 2010.. DOI: http://dx.doi.org/10.1590/S0100-40422010000500019


Abstract


It was carried out an electrochemical study of the cobalt electrodeposition onto HOPG electrode from an aqueous solution containing 10-2 M of CoSO4 + 1M (NH4)2SO4. Nucleation parameters such as nucleation rate, density of active nucleation sites, saturation nucleus and the rate constant of the proton reduction reaction (kPR) were determined from potentiostatic studies. An increase in kPR values with the decrease in the applied potential suggested a competition between H+ and Co2+ by the active sites on the surface. The ?G energy calculated for the formation of stable nucleus was 8.21x10-21 J/nuclei. The AFM study indicated the formation of small clusters of 50-400 nm in diameter and 2-120 nm in height.



Producto de Investigación




Artículos relacionados

Estudio de las Interacciones Ácido Húmico-Metales Pesados y Determinación de sus Constantes de Estab...

Do Spiroarsoranes Exhibit Polytopal Equilibrium in Solution?

Effect of TiO2-Al2O3 sol-gel supports on the superficial Ni and Mo species in oxidized and sulfided ...

Copper Electrodeposition On Glassy Carbon And Highly Oriented Pyrolytic Graphite Substrates From Per...

Electrochemical kinetic study about cobalt electrodeposition onto GCE and HOPG substrates from sulfa...

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

THEORETICAL STUDY ON THE MODIFICATION OF ACTIVE SITES IN GOLD SURFACES MODELED AS FINITE CLUSTERS: I...

Hydrogen bond studies in substituted N-(2-hydroxyphenyl)--2-[(4-methylbenzenesulfonyl)amino]acetamid...

Nucleation and growth of cobalt onto different substrates: Part I. Underpotential deposition onto a ...

Influence of the Crystallinity of the Substrate on Kinetic Parameters of Zinc Electrodeposition Proc...