Thermal efficiency evaluation of HI synthesis/concentration procedures in the thermochemical water splitting IS process

Seiji Kasahara, Shinji Kubo, Kaoru Onuki, Mikihiro Nomura

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Effects of operation parameters of HI synthesis and concentration procedures on thermal efficiency in the thermochemical hydrogen production IS process were investigated based on heat/mass balance. Concentration of HI was carried out by an electro-electrodialysis (EED) cell. Transport number of proton, electroosmosis coefficient and ratio of the flow rates at the inlets of the EED cell were considered as parameters of the EED cell in different over potential and temperature difference at the heat exchangers. The parameters of the EED cell had little effect on the thermal efficiency at optimized over potential and temperature difference. The relation between these parameters and thermal efficiency was dependent on over potential or temperature difference. These parameters should be optimized by a heat/mass evaluation. Composition of the solution produced at the HI synthesis procedure influenced thermal efficiency significantly. High thermal efficiency was expected at low I 2 concentration and high HI concentration.

Original languageEnglish
Pages (from-to)579-587
Number of pages9
JournalInternational Journal of Hydrogen Energy
Issue number6
Publication statusPublished - 2004 May 1



  • Hydrogen production
  • IS process
  • Sensitivity analysis
  • Thermal efficiency
  • 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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