Abstract
Abstract The electrolysis step (6) in the following hybrid cycle was studied. Reaction (7) has been confirmed experimentally in an earlier paper [1]. Decomposition voltage of the electrolysis is lowered by introducing CO2 into the catholyte to decrease the pH. Polarization characteristics and related phase diagrams of NaI-I2-H2O and Na2CO3-NaHCO3-H2O systems were examined. Both I2 formed in the anolyte and NaHCO3 formed in the catholyte could be separated by cooling and carbonating each electrolyte, respectively. Polarizations of anodic and cathodic reaction are very small in a range up to about 100 mA cm−2. Cell voltage at current density of 100 mA cm−2 on platinum-black at 50°C is estimated to be about 1.6 V. Increasing temperature is effective in reducing concentration polarization.
Published Version
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