A generalized treatment of the dynamics of the adsorption of Langmuirian systems at stationary or rotating disk electrodes

被引:11
作者
Bhugun, I [1 ]
Anson, FC [1 ]
机构
[1] CALTECH, Arthur Amos Noyes Lab Chem Phys, Div Chem & Chem Engn, Pasadena, CA 91125 USA
来源
JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 1997年 / 439卷 / 01期
基金
美国国家科学基金会;
关键词
D O I
10.1016/S0022-0728(97)00366-5
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A simple but comprehensive analysis of the behavior to be expected from molecules whose Langmuirian adsorption on electrodes is controlled by both their rate of transfer to the surface and the rate of their transformation from the dissolved to the adsorbed state (and vice-versa) is presented. A 'master equation' relating coverage and time is derived for cases where the mass transport of the adsorbate to the surface of the electrode is by linear diffusion (stationary electrode) or by convection-diffusion (rotating disk electrode). Five sub-cases are examined in which the influence of one (or a combination) of the factors controlling the adsorption is dominant. in each case, an easily computed, dimensionless, integral equation depending on only one parameter is derived. Corresponding calculated values of coverage vs. dimensionless time are presented and their shapes are discussed. A global description of the dynamics of adsorption for Langmuirian systems is thereby achieved. (C) 1997 Elsevier Science S.A.
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页码:1 / 6
页数:6
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