Recently, there has been muchinterest in the useof trifluoromethanesulfonic acid as anelectrolyte in advanced fuel cell systems because of the enhanced rate of oxygen reduction in this medium. In order to elucidate this characteristic from a double layer point of view, the present work was undertake
Application of the Cole—Cole plot to the study of adsorption kinetics at the mercury/electrolyte-solution interface
✍ Scribed by Katsuo Takahashi
- Publisher
- Elsevier Science
- Year
- 1968
- Tongue
- English
- Weight
- 729 KB
- Volume
- 13
- Category
- Article
- ISSN
- 0013-4686
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✦ Synopsis
The interfacial impedance was measured at the interface between mercury and aqueous electrolyte solutions containing some organic surface-active substances. The f 3 uency dispersion of the interfacial impedance asso&ted with the adsorption-desorption process 0 the organic substances was analysed by the method of Cole and Cole. The shapes of the Cole-Cole plot have been put into two groups, and the physical meaning of each group is explained in terms of the adsorption kinetics. Under certain conditions, the rate of adosrption of octyl-or decyl-sulphate ions is controlled by an activation process, whereas the adsorption of alcohols is controlled by the rate of diffusion. Electrical equivalent circuits have been determined for the two kinds of adsorption-desorption process.
R&ann&Mesure de l'impedance a l'interface mercure/6lectrolyte en solution aqueuse contenant quelques substances organiques surfactantes. La dispersion de fr&ptence de l'imp6dance interfaciale associb au processus adsorptiondesorption des substances organiques a 6te analysQ par la m&ode de Cole et Cole. Les formes des representations de Cole-Cole ont et6 class&s en deux groupes, la signification physique de chacun d'eux pouvant &re interpr6t6e en termes de cinbtique d'adsorption. Sous certaines conditions, la vitesse d'adsorption des ions octyl ou decyl-sulfate est control& par un processus d'activation bien que l'btape r&k&ice de Padsorption des alcools soit la diffusion. Des circuits &ctriques equivalents sont justifies pour chacune des sortes de processus adsorptiondesorption. Z~egMan ermittelte die Gmnzl%chenimpedanz an Quecksilber/wllssriger Elektrolyt-l&sung, welche verschiedene ober&henaktive organische Substanzen enthielten. Die mit dem Adsorption-Desorptionsproress der organ&hen Stoffe verbundene Frequenzdispersion wurde mit Hilfe der Methode von Cole und Cole untersucht. Der Verlauf der Cole-Cole-Kurven wurde in zwei Abschniti ein
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