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Use of mixed conducting membranes to produce hydrogen by water dissociation
U. Balachandran , , T. H. Lee, S. Wang and S. E. Dorris
Energy Technology Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA
International Journal of Hydrogen Energy
Volume 29, Issue 3 , March 2004, Pages 291

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Abstract
    We have studied the production of hydrogen by water dissociation at moderate temperatures (700–900°C) with novel mixed-conducting membranes. Hydrogen production rates were investigated as a function of temperature, water partial pressure, membrane thickness, and oxygen chemical potential gradient across the membranes. The hydrogen production rate increased with both increasing moisture concentration and oxygen chemical potential gradient. A hydrogen production rate of 6 cm3(STP)/mincm2 was measured with a 0.10-mm-thick membrane at 900°C and 50 vol% water vapor on one side of the membrane and 80% hydrogen (balance helium) on the other side. Hydrogen was used as a model gas on one side of the membrane to establish a high oxygen potential gradient; however, another reducing gas, methane, was substituted in one experiment to maintain the high oxygen potential gradient. The hydrogen production rate increased with decreasing membrane thickness, but surface kinetics played an important role as membrane thickness decreased.
    Author Keywords: Hydrogen production; Water dissociation; Electron conductor; Oxygen-ion conductor; Ceramic membranes

Extraits

Natural gas-assisted water dissociation
using ceramic membranes
Biological pathways to hydrogen
The solar "Graal" of hydrogen?
Hydrogen production cost
Hydrogen station: ECTOS project
Some successes of the icelandic hydrogen project
Conclusion
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