Modern concepts on the structure of the ionic part of EDL are based on three theories developed even in the first third of the twentieth century. The first one — the Gouy 1-Chapman 2 theory — considers the laws of electrostatic adsorption of ions caused by the interaction of the latter with the outer charge of the electrode. Thereafter, the Poisson-Boltzmann equation, which is the basic equation of the GouyChapman theory, found a wide application in the interpretation of electrochemical experiments, in the theory of stability of DLVO colloids 3–5, in the theory of surface forces 6,7, in the theory of electrokinetic phenomena 8, etc. Actually, the Gouy-Chapman theory is at present one of the basic theories of the equilibrium double layer.
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