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

被引：16

作者：

Huerta, F ^{[1
]}

Morallón, E ^{[1
]}

Vázquez, JL ^{[1
]}

机构：

[1] Univ Alicante, Dept Quim Fis, E-03080 Alicante, Spain

来源：

SURFACE SCIENCE | 1999年 / 431卷 / 1-3期

关键词：

chemisorption; cyanide; electrochemical methods; metal-electrolyte interfaces; platinum; single crystal surfaces; surface structure;

D O I：

10.1016/S0039-6028(99)00580-4

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Cyanide adlayers formed on Pt(lll) were investigated at submonolayer coverages under electrochemical conditions in sulfuric acid medium. For small coverage (theta) 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 theta(CN), 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. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：L577 / L581

页数：5

共 10 条

[1] IN-SITU SPECTROSCOPY OF CYANIDE VIBRATIONS ON PT(111) AND PT(110) ELECTRODE SURFACES - POTENTIAL DEPENDENCIES AND THE INFLUENCE OF SURFACE DISORDER [J].