Kinetic and mechanistic study of hydroxyl ion electrosorption at the Pt(111) surface in alkaline media

被引：31

作者：

Drazic, DM ^{[1
]}

Tripkovic, AV ^{[1
]}

Popovic, KD ^{[1
]}

Lovic, JD ^{[1
]}

机构：

[1] Univ Belgrade, ICTM, Inst Electrochem, Belgrade, Yugoslavia

来源：

JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 1999年 / 466卷 / 02期

关键词：

Pt(111) surface; alkaline solution; quasi-equilibrium conditions; Frumkin isotherm; linear Tafel approximation region; exchange current density;

D O I：

10.1016/S0022-0728(99)00130-8

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The adsorption of OH- ions on the Pt(111) plane has been studied by fast cyclic voltammetry in sodium hydroxide solutions (0.03 to 1 M), under quasi-equilibrium and Tafel approximation conditions. It was shown that the OH- ion adsorption is an electrosorption process with one electron exchanged between an OH- ion and the platinum surface. The electrosorption process follows the Frumkin adsorption isotherm with low intensity repulsive interactions of the adsorbed species (f=2-3). The estimated values of the standard electrochemical rate constant (k degrees = 5.6 x 10(-4) cm s(-1)) and the standard exchange current density (j = 5.45 x 10(-2) A cm(-2)) indicate a rather fast electrochemical process. (C) 1999 Elsevier Science S.A. All rights reserved.

引用

页码：155 / 164

页数：10

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