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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- Nikonenko, V.V., Pis'menskaya, N.D. & Volodina, E.I. Russ J Electrochem (2005) 41: 1205. doi:10.1007/s11175-005-0203-z
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.