Structural effects of adsorbed CN adlayers on the co-adsorption of OH− at the Pt(111) surface in sulfuric acid medium

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Title: Structural effects of adsorbed CN adlayers on the co-adsorption of OH− at the Pt(111) surface in sulfuric acid medium
Authors: Huerta Arráez, Francisco | Morallon, Emilia | Vázquez Picó, José Luis
Research Group/s: Electrocatálisis y Electroquímica de Polímeros
Center, Department or Service: Universidad de Alicante. Departamento de Química Física
Keywords: Chemisorption | Cyanide | Electrochemical methods | Metal–electrolyte interfaces | Platinum | Single crystal surfaces | Surface structure
Knowledge Area: Química Física
Date Created: 22-Apr-1999
Issue Date: 1-Jul-1999
Publisher: Elsevier
Citation: HUERTA ARRÁEZ, Francisco; MORALLÓN NÚÑEZ, Emilia; VÁZQUEZ PICÓ, José Luis. "Structural effects of adsorbed CN adlayers on the co-adsorption of OH− at the Pt(111) surface in sulfuric acid medium". Surface Science. Vol. 431, Issues 1-3 (1 July 1999). ISSN 0039-6028, pp. L577-L581
Abstract: Cyanide adlayers formed on Pt(111) were investigated at submonolayer coverages under electrochemical conditions in sulfuric acid medium. For small coverage (θ) values, cyclic voltammetry indicates the formation of surface domains of adsorbed cyanide (islands). Great distances separate the islands in such a way that the reversible adsorption of sulfate/bisulfate ions takes place quite easily on this bare area. Simultaneously, the reversible adsorption of OH− ions occurs in the gaps between adjacent clusters of each island. Increasing the coverage of CNads results in a progressive diminution of the distance between islands and, consequently, to a decrease in the extent of sulfate adsorption. Conversely, the higher θCN, the larger the number of sites for OH− adsorption (higher number of rows between hexagonal clusters). Thus, the adsorption of hydroxyl species is enhanced at high cyanide coverage in this medium.
Sponsor: Ministerio de Educación y Ciencia (PB97-0130); European Commission (CECA 7220-PR039)
URI: http://hdl.handle.net/10045/7816
ISSN: 0039-6028
DOI: 10.1016/S0039-6028(99)00580-4
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/S0039-6028(99)00580-4
Appears in Collections:INV - GEPE - Artículos de Revistas

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