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Experimental Study for HIx Concentration by Electro-Electrodialysis (EED) Cells in the Water Splitting Sulfur-Iodine Thermochemical Cycle

ENEA Casaccia Research Center, via Anguillarese 301, 00123 Rome, Italy
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ChemEngineering 2019, 3(2), 50; https://doi.org/10.3390/chemengineering3020050
Received: 6 February 2019 / Revised: 5 May 2019 / Accepted: 8 May 2019 / Published: 12 May 2019
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Abstract

The efficiency of HI concentration/separation from a HIx solution, (mixture of HI/H2O/I2) 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 HIx 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/cm2. Results showed that an increase in HI concentration can be obtained under certain conditions. The apparent transport number (t+) 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. View Full-Text
Keywords: bunsen reaction; sulfur-iodine cycle; thermochemical water splitting; electrodialysis bunsen reaction; sulfur-iodine cycle; thermochemical water splitting; electrodialysis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Caputo, G.; Balog, I.; Giaconia, A.; Sau, S.; Pozio, A. Experimental Study for HIx Concentration by Electro-Electrodialysis (EED) Cells in the Water Splitting Sulfur-Iodine Thermochemical Cycle. ChemEngineering 2019, 3, 50.

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