Document
type: Class

Electromicrogravimetric study of underpotential deposition of Co on textured gold electrode in ammonia medium
type: Entity
issue: 10
related by: authorship_11179
doi: 10.1039/b704891b
volume: 31
chemicalscas: ammonia, 14798-03-9, 51847-23-5, 7664-41-7; cobalt, 7440-48-4; gold, 7440-57-5; hydrogen, 12385-13-6, 1333-74-0; silicon dioxide, 10279-57-9, 14464-46-1, 14808-60-7, 15468-32-3, 60676-86-0, 7631-86-9
crisid: 1866
has publication venue: New Journal of Chemistry
most specific type: Article
origen: scopus
page end: 1776
type: Document
freetext keyword: ammonia; cobalt; gold; hydrogen; silicon dioxide; adsorption; amperometry; article; density; electrode; electron; gravimetry; mechanics; potentiometry; priority journal; system analysis
abstract: Formation of a layer of a metal M on a foreign metal substrate, S, at potentials positive to its reversible potential, Er, (underpotential deposition, UPD) is a phenomenon that appears only in some systems. In the case of the UPD process of Co on a gold substrate, there is still a controversy about its existence, for which reason, in this study, voltammetry and chronoamperometry were coupled with a quartz microbalance in ammonium solution to better understand its formation mechanism. The results obtained show that the Co forms only one layer on the substrate before the bulk deposition of cobalt occurs. During the UPD process, the Co atom completely transfers its two electrons to the electrode and is adsorbed as a discharged species. The monolayer charge density, determined by electromicrogravimetry, is 448 μC cm-2 and probably corresponds to a commensurate overlayer on the gold substrate. In addition, the UPD process is controlled by adsorption as shown by voltammetric experiments. Finally, the analysis of the process of Co monolayer destruction (desorption) shows a mechanism different from that in the formation process, possibly due to H adsorption on the substrate produced during the process of adsorption of Co. © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.
page start: 1769
date time value: article date 1866
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related by: authorship_11180
estado: published
related by: authorship_11178

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Article
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New Journal of Chemistry
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publication venue for: Electromicrogravimetric study of underpotential deposition of Co on textured gold electrode in ammonia medium
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