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

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

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

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

Efecto de la composición del soporte sobre las estructuras superficiales de óxidos de níquel y molib...

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

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

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

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

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

Predicting the Phase Diagram of a Liquid Crystal Using the Convex Peg Model and the Semiempirical PM...