Double Layer Changes Research Articles

Effect of tribenzylammonium ions upon VO 2+ reduction in sulphuric medium on mercury

The effect of tribenzylammonium ions upon the reduction rate of VO 2+ in sulphuric medium at a dropping mercury electrode was studied in detail. In this connection the surface concentration of the cationic surfactant as well as the charge density q M on the metal during drop growth were determined by independent means. It was shown that the Frumkin correction for diffuse-layer effects overestimates the effect of the double-layer changes due to tribenzylammonium adsorption upon the electrode reaction under study. Discrepancies between experiment and theoretical predictions can be qualitatively explained by the complicated double-layer structure in the presence of bulky surface-active ions and/or by ion-pair formation between reactant and supporting electrolyte.

Kinetics of the Zn(Hg)/Zn(II) electrode in acid chloride solution

From fast galvanostatic and chronopotentiometric polarization measurements in both directions of the Zn(Hg)/Zn(II) electrode at 25°C in 1 M chloride solutions of pH 3, it is found that charge transfer occurs in two consecutive steps (Zn(Hg)/Zn(I)/Zn(II)), that both steps are essentially symmetric, and that they are little affected by double-layer changes (including chloride adsorption) within the potential region covered (−1.2 to −0.8 V (SCE)). For both steps, quantitative kinetic data are presented and discussed.

Kinetics of the Zn(Hg)/Zn(II) electrode in acid chloride solution

Summary From fast galvanostatic and chronopotentiometric polarization measurements in both directions of the Zn(Hg)/Zn(II) electrode at 25°C in 1 M chloride solutions of pH 3, it is found that charge transfer occurs in two consecutive steps (Zn(Hg)/Zn(I)/Zn(II)), that both steps are essentially symmetric, and that they are little affected by double-layer changes (including chloride adsorption) within the potential region covered (−1.2 to −0.8 V (SCE)). For both steps, quantitative kinetic data are presented and discussed.