{"title":"Utilisation de l'tmpedance operationnelle pour la determination des coefficients de diffusions1","authors":"Eugéne Levart, Emmanuel Poirier, D'angÉ D'orsay","doi":"10.1016/S0022-0728(96)80002-7","DOIUrl":null,"url":null,"abstract":"<div><p>Analytical expressions for the operational impedance, <em>Zs</em>, valid for all relaxation methods, are proposed for various types of electrode reactions.</p><p>Used experimentally, they enable kinetic parameters, and, more particularly, diffusion coefficients of reacting species to be determined.</p><p>The experimental part of the work is concerned with measurements made under galvanostatic pulse conditions for the Hg/Hg<sub>2</sub><sup>2+</sup> system in HClO<sub>4</sub> media at 30°. The results, stated in terms of the Laplace operator function, <em>s</em>, have shown that the diffusion coefficient of mercury ion is approximately constant at supporting electrolyte concentrations between 0.1 and 2 <em>M</em>.</p><p>The merits of the proposed, procedure are compared, with those of other electrochemical methods for the determination of diffusion coefficients.</p></div>","PeriodicalId":100778,"journal":{"name":"Journal of Electroanalytical Chemistry (1959)","volume":"12 4","pages":"Pages 277-285"},"PeriodicalIF":0.0000,"publicationDate":"1966-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0022-0728(96)80002-7","citationCount":"18","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Electroanalytical Chemistry (1959)","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0022072896800027","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 18
Abstract
Analytical expressions for the operational impedance, Zs, valid for all relaxation methods, are proposed for various types of electrode reactions.
Used experimentally, they enable kinetic parameters, and, more particularly, diffusion coefficients of reacting species to be determined.
The experimental part of the work is concerned with measurements made under galvanostatic pulse conditions for the Hg/Hg22+ system in HClO4 media at 30°. The results, stated in terms of the Laplace operator function, s, have shown that the diffusion coefficient of mercury ion is approximately constant at supporting electrolyte concentrations between 0.1 and 2 M.
The merits of the proposed, procedure are compared, with those of other electrochemical methods for the determination of diffusion coefficients.
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