Producción Científica Profesorado

Underpotential deposition of cobalt onto polycrystalline platinum



Mendoza Huizar, Luis Humberto

2011

Underpotential deposition of Cobalt onto polycrystalline platinum. Journal of Solid State Electrochemistry. L.H. Mendoza-Huizar, C.H. Rios-Reyes. DOI: 10.1007/s10008-010-1146-1


Abstract


An electrochemical study of cobalt electrodeposition onto a polycrystalline platinum electrode from an aqueous solution (10?2 M CoCl2?+?1 M NH4Cl (pH 9.5)) was carried out through cyclic voltammetry and potential step techniques. Analysis of the voltammetric data clearly showed that a cobalt adlayer is formed during the application of potential in the underpotential deposition (upd) region. Formation of this cobalt adlayer involved the simultaneous presence of both adsorption and 2D nucleation processes. Cobalt adlayers obtained by linear voltammetry in upd region were analyzed employing diffuse reflectance spectroscopy (DRS). By using theoretical quantum studies at PM6//HF/LANL1MB level, it was possible to assign the peaks obtained by DRS at 328 and 337 nm to the cobalt adsorption on Pt(111) and Pt(100), respectively, while the signals recorded at 355 and 362 nm were related with the clean platinum surfaces Pt(100) and Pt(111). Also, quantum calculations at the PM6 level indicated that the energy formation order is Co-Pt(100)?>?Co-Pt(111)?>?Co-Pt(110)?>?Co-Co(surface).



Producto de Investigación




Artículos relacionados

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

Influence of the Cation Nature of the Sulphate Salt on the Electrochemical Synthesis of Sulfate-Dope...

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

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

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

Do Spiroarsoranes Exhibit Polytopal Equilibrium in Solution?

A theoretical quantum study on the distribution of electrophilic and nucleophilic active sites on Ag...

Characterization of Main Anthocyanins Extracted from Pericarp Blue Corn by MALDI-ToF MS

Magnetic transition phase diagram of cobalt clusters electrodeposited on HOPG: Experimental and micr...

Revisión de variables de diseño y condiciones de operación en la electrocoagulación