Double-layer effects on the Cs+ ion transfer kinetics at the water/nitrobenzene interface

✍ Scribed by Zdenďek Samec; Takashi Kakiuchi; Mitsugi Senda

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 690 KB
• Volume: 40
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(95)00230-c

✦ Synopsis

Double layer effects on the kinetics of the Cs' Ion transfer across the water/nitrobenzene interface were studied by an ac polarographic technique. Apparent kinetic parameters agree well with those reported previously.

By applying the Frumkin-type correction based on the Gouy-Chapman theory, the non-linear Tafel plots were inferred indicating some dependence of the charge transfer coeflicient on the interfacial potential difference. The latter effect can weaken the contribution of the diffuselayer potentials to the apparent kinetic parameters, thereby accounting in part for the observed negligible change of these parameters with the aqueous electrolyte concentration. The Frumkin-type correction failure at low electrolyte concentrations and high surface charge densities is due to an overestimation of the diffuse/layer potential by the Gouy-Chapman theory, rather than due to the dynamic (Levich) effect of the diffuse double layer.