Gheorghe Semenescu
 Faculty of Science, University of Pitesti, Romania

Constantin Cioaca, Gabriela Gughea, Bogdan Iorga
 Department of Physics, Faculty of Chemistry, University of Bucharest,
Regina Elisabeta Avenue, No. 4-12, Bucharest-70346, Romania

Abstract
The “tension surface” defined by Gibbs in treating the interface area is structurally specified by a “transition layer” made up by the outer Helmholtz plane and the one containing the surface active centres.
In the “double mixed electrode layer” model, considered to be one step taken towards the microscopic-level understanding of the electrolyte interface phenomena, the electrochemical sensors operations, as well as the electric phenomena at the membrane level are explained in a simple manner, and the cyclic polarisation potentio-dynamic diagrams can be more simply interpreted.