Hydrogen production by SI process, with electrodialysis stack embedded in HI decomposition section

Kyoung Soo Kang, Chang Hee Kim, Jong Won Kim, Won Chul Cho, Seong Uk Jeong, Chu Sik Park, Byung Heung Park, Jeong Won Kang, Ki Kwang Bae

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Hydrogen production by the sulfur-iodine (SI) process, with an electrodialysis (ED) stack embedded in the HI decomposition section (SEC3) to concentrate HI in the HIx solution and overcome the pseudo-azeotrope, was conducted under pressurized conditions. The HIx solution of H2O/HI = 5.63-6.13 and I2/HI = 0.57-1.97 was supplied to the SEC3. HI gas was concentrated in a packed distillation column and decomposed over Pt/Al2O3. The experimental results of distillation column operation under different feed rates and HIx compositions are reported. The raffinate from the column showed a pseudo-azeotropic HIx mixture, as predicted in previous research. The dynamic responses of the ED stack were examined during the start-up period according to the HIx feed composition at the anode inlet. The ED voltage changed with the I2 concentration in the inlet flow. The proton transport number (t+) and electro-osmosis coefficient (β) were estimated for the ED stack during the operations. Hydrogen production ranged from 18.3 to 50 L/h, depending on the operating conditions and HIx feed composition.

Original languageEnglish
Pages (from-to)4560-4569
Number of pages10
JournalInternational Journal of Hydrogen Energy
Issue number8
Publication statusPublished - 2016 Mar 2


  • Electrodialysis
  • Nuclear hydrogen
  • Sulfur-iodine process
  • Thermochemical cycle
  • Water splitting

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology


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