Abstract
The electrolysis step in the following hybrid cycle Na 2CO 3+I 2→2NaI+CO 2 1 2 O 2 2NaI+2NH 3+2CO 2+2H 2O→2NaHCO 3 +2NH 4I 2NaHCO 3→Na 2CO 3+CO 2+H 2O ▪ was studied. The solubility of iodine in the anolyte (NH 4I-I 2 solution), steady state compositions of the catholyte (NH 4I-NH 3 solution), polarization characteristics for both electrolyte solutions and the nature of ion-exchange membranes was examined. The polarizations of the anode were very small, in a range up to 1000 mA cm −2, and those of the cathode were also relatively small. An advantageous feature of this electrolysis over NaI electrolysis [1] is that a large current density is obtainable. Decomposition voltages assumed from the polarization curves are small compared with NaI electrolysis. This improvement arises from greater solubilities of electrolytes. Among the ion-exchange membranes tested, Nafion was usable because of durability of the electrolyte solution and low permeation of iodine.
Published Version
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