, Volume 41, Issue 11, pp 1205-1210

Rate of Generation of Ions H+ and OH at the Ion-Exchange Membrane/Dilute Solution Interface as a Function of the Current Density

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Abstract

Partial currents of water dissociation products through cation- and anion-exchange membranes that form thin desalination channels in electrodialyzers are measured. The investigations are performed in a broad interval of flow rates during desalination of dilute sodium chloride solutions at overlimiting currents. A water dissociation theory, which was developed for bipolar membranes, and a mass transfer theory that allows for the space charge formation at overlimiting currents are used to derive an expression, according to which the rate of generation of the H+ and OH ions is defined by the ratio of the current density to its critical value at which water starts undergoing discernible dissociation.

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Translated from Elektrokhimiya, Vol. 41, No. 11, 2005, pp. 1351–1357.
Original Russian Text Copyright © 2005 by Nikonenko, Pis'menskaya, Volodina.