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Hi Concentration by Electro-Electrodialysis from Hix Solution (Hi-I2-H2o Mixture) for Hi Decomposition Reaction in Is (Iodine-Sulfur) Process

Gab-Jin Hwang1, Seong-Dae Hong2, Jeong-Geun Kim2, Sang-Ho Lee2, Sang-Il Choi2, and Ki-Kwang Bae2. (1) Korea Institute of Energy Research, 71-2 Jang-dong, Yuseong-gu, Daejeon, 305-343, Korea, (2) Hydrogen Energy research Group, Korea Institute of Energy Research, 71-2 Jang-dong, Yuseong-gu, Daejeon, 305-343, Korea

Electro-electrodialysis (EED) experiments were carried out for the HI concentration from HIx (HI-H2O-I2) solution to improve the HI decomposition reaction in the thermochemical water-splitting IS (Iodine-Sulfur) process. EED cell is composed of the collector, electrode and electrolyte. Nafion 117 which was cation exchange membrane used as an electrolyte, and the activated carbon cloth used as an electrode. The HI concentration experiment was carried out using the HIx solution and molar ratio of the I2 were varied from 1 to 3 moles. The cell voltages were decreased with an increase in temperature. And, membrane properties such as transport number of proton and electro-osmosis coefficient were decreased with an increase in temperature.