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

Evaluación de Esteroides Aromáticos como Indicadores de Madurez Térmica en Extractos de Roca

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

Nucleation and growth of cobalt onto different substrates: Part II. The upd-opd transition onto a go...

Cobalt Electrodeposition Process from Electrolytic Baths based on CoSO4 and (NH4)2SO4. Influence of ...

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

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

A Voltammetric Study Of The Underpotential Deposition Of Cobalt Onto A Glassy Carbon Electrode

Underpotential deposition of cobalt onto polycrystalline platinum

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

Synthesis of Zn compounds derived from 1H-benzimidazol-2-ylmethanamine