Abstract

When an electric current passes across a boundary between a liquid membrane and an aqueous solution, it can give rise to a diffusion over-potential, to an ion transfer overpotential or to both. The application of chronopotentiometry and impedance measurement methods to study the ion transfer reaction at theses interfaces is described. With these methods, it is possible to determine some parameters of the ionic transfer kinetics: transfer coefficients, rate constants and to get information about the diffusion overpotential. On the other hand, the values of the interfacial double-layer capacitance can be determined by impedance measurements.

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