Hydrogen exchange between cell compartments

A number of methods of producing chlorine dioxide electrochemically using perm selective membranes are found in the patent literature. Harke et. aL produced chlorine dioxide in a three compartment electrolytic cell [56]. A buffer compartment located between the anode and cathode compartments was separated from the cathode side by a cation exchange membrane and from the anode side by an am on exchange membrane. Hydrogen chloride was fed to the anode compartment, aqueous alkali metal chlorate and chloride to the buffer compartment, and water to the cathode. Chlorine and chlorine dioxide are taken off from the anode compartment while hydrogen and alkali metal hydroxide are removed from the cathode compartment. 

Sweeney et. cd. used a similar three compartment cell, but included a bipolar electrode in the middle compartment between the anion and cation exchange membranes in addition to a cathode and an anode in their respective compartments [57]. When the cell was filled with brine and a D.C. current applied to it, hydrogen was evolved at the cathode and a mixture of chlorine and chlorine dioxide at the... 

A dynamic method called Hittorf s method allows determining transport numbers under migration, a method comparable with a fuel cell under operation. The two compartments in the cell are separated by an ion exchange membrane and both compartments are filled with the same KOH solution (same concentration). A current is applied between the two electrodes on either side of the compartments. At the cathode, hydrogen and hydroxide are produced, while at the anode hydroxide is consumed and oxygen is produced. To maintain electroneutrality, the cations (K" ) and anions (OH ) present in the solution migrate through the membrane from one compartment to the other. Anionic and cationic transport numbers f and f ) can subsequently be determined [20,205,206] ... 

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