Improvement of the thermochemical water-splitting IS (iodine-sulfur) process by electro-electrodialysis

Gab Jin Hwang, Kaoru Onuki, Mikihiro Nomura, Seiji Kasahara, Jong Won Kim

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

The electro-electrodialysis (EED) was carried out to improve HI concentration process in the thermochemical water-splitting IS (iodine-sulfur) process. The HI concentration from HIx solution (molar ratio of HI:H2O:I2=1:5:4) by EED was examined using a commercial cation exchange membrane (Nafion 117) at the current density of 9.9A/dm2 and the cell temperature of 110°C. The molality of HI in catholyte increased from the starting value of 10.6mol/kg to a final one of over 15mol/kg, whereas that of anolyte decreased from 10.2 to 5.2mol/kg. Durability test of the membrane was carried out by soaking in HIx solution (molar ratio of HI:H2O:I2=1:5:0.5) at 120°C. The membrane properties (membrane area resistance in 1mol/l HCl and static transport number in 0.1 and 0.01mol/l HCl) were measured as the indicator of the stability. After the soaking time of 3 months, the area resistance of membrane increased a little, and the static transport number decreased a little. The electrical energy demand of EED obtained in this study was 69.8kJ/mol-H2 to produce the hydrogen of 1mol. It is expected that the application of EED in IS process would be very useful with proposing the possibility of the larger improvement in thermal efficiency.

Original languageEnglish
Pages (from-to)129-136
Number of pages8
JournalJournal of Membrane Science
Volume220
Issue number1-2
DOIs
Publication statusPublished - 2003 Aug 1
Externally publishedYes

Fingerprint

electrodialysis
Electrodialysis
water splitting
Iodine
Sulfur
iodine
sulfur
membranes
Membranes
Water
soaking
thermodynamic efficiency
electric power
durability
Cations
Hydrogen
Ion exchange
Durability
Current density
Positive ions

Keywords

  • Cation exchange membrane
  • Electro-electrodialysis
  • Hydrogen
  • Thermochemical hydrogen production
  • Water-splitting

ASJC Scopus subject areas

  • Filtration and Separation
  • Polymers and Plastics

Cite this

Improvement of the thermochemical water-splitting IS (iodine-sulfur) process by electro-electrodialysis. / Hwang, Gab Jin; Onuki, Kaoru; Nomura, Mikihiro; Kasahara, Seiji; Kim, Jong Won.

In: Journal of Membrane Science, Vol. 220, No. 1-2, 01.08.2003, p. 129-136.

Research output: Contribution to journalArticle

Hwang, Gab Jin ; Onuki, Kaoru ; Nomura, Mikihiro ; Kasahara, Seiji ; Kim, Jong Won. / Improvement of the thermochemical water-splitting IS (iodine-sulfur) process by electro-electrodialysis. In: Journal of Membrane Science. 2003 ; Vol. 220, No. 1-2. pp. 129-136.
@article{403d1f3dbdf345bb8ab7726aa803c1bb,
title = "Improvement of the thermochemical water-splitting IS (iodine-sulfur) process by electro-electrodialysis",
abstract = "The electro-electrodialysis (EED) was carried out to improve HI concentration process in the thermochemical water-splitting IS (iodine-sulfur) process. The HI concentration from HIx solution (molar ratio of HI:H2O:I2=1:5:4) by EED was examined using a commercial cation exchange membrane (Nafion 117) at the current density of 9.9A/dm2 and the cell temperature of 110°C. The molality of HI in catholyte increased from the starting value of 10.6mol/kg to a final one of over 15mol/kg, whereas that of anolyte decreased from 10.2 to 5.2mol/kg. Durability test of the membrane was carried out by soaking in HIx solution (molar ratio of HI:H2O:I2=1:5:0.5) at 120°C. The membrane properties (membrane area resistance in 1mol/l HCl and static transport number in 0.1 and 0.01mol/l HCl) were measured as the indicator of the stability. After the soaking time of 3 months, the area resistance of membrane increased a little, and the static transport number decreased a little. The electrical energy demand of EED obtained in this study was 69.8kJ/mol-H2 to produce the hydrogen of 1mol. It is expected that the application of EED in IS process would be very useful with proposing the possibility of the larger improvement in thermal efficiency.",
keywords = "Cation exchange membrane, Electro-electrodialysis, Hydrogen, Thermochemical hydrogen production, Water-splitting",
author = "Hwang, {Gab Jin} and Kaoru Onuki and Mikihiro Nomura and Seiji Kasahara and Kim, {Jong Won}",
year = "2003",
month = "8",
day = "1",
doi = "10.1016/S0376-7388(03)00224-2",
language = "English",
volume = "220",
pages = "129--136",
journal = "Jornal of Membrane Science",
issn = "0376-7388",
publisher = "Elsevier",
number = "1-2",

}

TY - JOUR

T1 - Improvement of the thermochemical water-splitting IS (iodine-sulfur) process by electro-electrodialysis

AU - Hwang, Gab Jin

AU - Onuki, Kaoru

AU - Nomura, Mikihiro

AU - Kasahara, Seiji

AU - Kim, Jong Won

PY - 2003/8/1

Y1 - 2003/8/1

N2 - The electro-electrodialysis (EED) was carried out to improve HI concentration process in the thermochemical water-splitting IS (iodine-sulfur) process. The HI concentration from HIx solution (molar ratio of HI:H2O:I2=1:5:4) by EED was examined using a commercial cation exchange membrane (Nafion 117) at the current density of 9.9A/dm2 and the cell temperature of 110°C. The molality of HI in catholyte increased from the starting value of 10.6mol/kg to a final one of over 15mol/kg, whereas that of anolyte decreased from 10.2 to 5.2mol/kg. Durability test of the membrane was carried out by soaking in HIx solution (molar ratio of HI:H2O:I2=1:5:0.5) at 120°C. The membrane properties (membrane area resistance in 1mol/l HCl and static transport number in 0.1 and 0.01mol/l HCl) were measured as the indicator of the stability. After the soaking time of 3 months, the area resistance of membrane increased a little, and the static transport number decreased a little. The electrical energy demand of EED obtained in this study was 69.8kJ/mol-H2 to produce the hydrogen of 1mol. It is expected that the application of EED in IS process would be very useful with proposing the possibility of the larger improvement in thermal efficiency.

AB - The electro-electrodialysis (EED) was carried out to improve HI concentration process in the thermochemical water-splitting IS (iodine-sulfur) process. The HI concentration from HIx solution (molar ratio of HI:H2O:I2=1:5:4) by EED was examined using a commercial cation exchange membrane (Nafion 117) at the current density of 9.9A/dm2 and the cell temperature of 110°C. The molality of HI in catholyte increased from the starting value of 10.6mol/kg to a final one of over 15mol/kg, whereas that of anolyte decreased from 10.2 to 5.2mol/kg. Durability test of the membrane was carried out by soaking in HIx solution (molar ratio of HI:H2O:I2=1:5:0.5) at 120°C. The membrane properties (membrane area resistance in 1mol/l HCl and static transport number in 0.1 and 0.01mol/l HCl) were measured as the indicator of the stability. After the soaking time of 3 months, the area resistance of membrane increased a little, and the static transport number decreased a little. The electrical energy demand of EED obtained in this study was 69.8kJ/mol-H2 to produce the hydrogen of 1mol. It is expected that the application of EED in IS process would be very useful with proposing the possibility of the larger improvement in thermal efficiency.

KW - Cation exchange membrane

KW - Electro-electrodialysis

KW - Hydrogen

KW - Thermochemical hydrogen production

KW - Water-splitting

UR - http://www.scopus.com/inward/record.url?scp=0041666667&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0041666667&partnerID=8YFLogxK

U2 - 10.1016/S0376-7388(03)00224-2

DO - 10.1016/S0376-7388(03)00224-2

M3 - Article

AN - SCOPUS:0041666667

VL - 220

SP - 129

EP - 136

JO - Jornal of Membrane Science

JF - Jornal of Membrane Science

SN - 0376-7388

IS - 1-2

ER -