Oxidative adsorption and hydrogen-mediated desorption of parabanic acid on Pt(111) electrodes

被引：4

作者：

Albalat, R

Claret, J

Rodes, A

Feliu, JM

机构：

[1] Univ Barcelona, Dept Quim Fis, E-08028 Barcelona, Spain

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

来源：

JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 2003年 / 550卷

关键词：

molecular charge transfer adsorption; parabanic acid; pt(111); spectroelectrochemistry; hydrogen-induced desorption;

D O I：

10.1016/S0022-0728(02)01417-1

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The adsorption properties of parabanic acid (PBA) on Pt(111) electrodes are described. The process takes place with charge transfer at potentials higher than 0.175 V. The PBA adlayer is particularly stable against oxidation or CO adsorption but is desorbed upon hydrogen adsorption. Comparison between voltammetric charges and charge displacement experiments, carried out at low potentials, enables the estimation of the PBA contribution to the overall voltammetric charge. Spectroelectroelectrochemical experiments suggest that PBA adsorption takes place through one of its nitrogen atoms, after breaking of the corresponding N-H bond. The kinetics of the PBA adlayer desorption takes place through an instantaneous nucleation and growth mechanism, linked to the adsorption of hydrogen atoms. (C) 2002 Elsevier Science B.V. All rights reserved.

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收藏

页码：53 / 65

页数：13

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