| Summary: | The efficiency of HI concentration/separation from a HI<sub>x</sub> solution, (mixture of HI/H<sub>2</sub>O/I<sub>2</sub>) represents a crucial factor in the sulfur-iodine thermochemical water splitting process for hydrogen production. In this paper, an experimental study on HI cathodic concentration in HI<sub>x</sub> solution using stacked electro-electrodialysis (EED) cells was carried out under the conditions of 1 atm and at three different temperature (25, 55 and 85 °C) and using a current density of 0.10 A/cm<sup>2</sup>. Results showed that an increase in HI concentration can be obtained under certain conditions. The apparent transport number (t<sub>+</sub>) in all the experiments was very close to 1, and the electro-osmosis coefficient (β) changed in a range of 1.08–1.16. The tests showed a detectable, though slow, increase in both the anodic iodine and cathodic hydriodic acid concentrations.
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