Water thermal splitting

Direct, One-Step Thermal Water Splitting. The water decomposition reaction has a very positive free energy change, and therefore the equihbrium for the reaction is highly unfavorable for hydrogen production. 

The limitation of solvent evaporation could be avoided by working at high temperature with water vapor in the presence of a solid electrolyte (steam electrolysis). Nominally, at about 4000°C, at which AG = 0, electroless thermal water splitting would be realized. In practice, problems of material stability, necessary... 

Perkins C, Weimer AW (2004) Likely near-term solar-thermal water splitting technologies. Int J Hydrogen Energy 29 1587-1599... 

O Brien, J.E. (2008b), Thermodynamic Considerations for Thermal Water Splitting Processes and High-temperature Electrolysis , 2008 ASME International Congress and Exposition, Boston, MA, USA, November, paper IMECE2008-68880. 

Direct Solar Thermal Water Splitting to Generate Hydrogen Fuel... 

Kogan has calculated that, at a pressure of 0.05 bar, water dissociation is barely discernible at 2000 K.1 By increasing the temperature to 2500 K, 25% of water vapor dissociates at the same pressure. A further increase in temperature to 2800 K under constant pressure causes 55% of the vapor to dissociate.1 These basic facts indicate the difficulties that must be overcome in the development of a practical hydrogen production by solar thermal water splitting ... 

IV. Development of porous ceramic membranes for a solar thermal water-splitting reactor, Int. J. Hydrogen Energy, 25 1043-1050 (2000). 

Production of Hydrogen and Ethylene by Combining Thermal Water Splitting with Oxidative Dehydrogenation... 

Figure 16.18 CPOM with thermal water splitting as oxygen source Amount of H2 obtained on the retentate side after H2O condensation (O) and amount of O2 transported through the OTM (O) to the methane side where the CPOM takes place as a function of temperature. Experimental details Flow rate on the cores side of the BCFZ hollow fiber membrane = 40 mL min (30 mL min H2O + 10 mL min He). Flow rate on the shell side = 50 mL min (3 mL min Ne + 47 mL min CH4). 0.88 cm ...

Figure 16.19 CPOM with thermal water splitting as oxygen source CH4 conversion (O) and CO selectivity Experimental details Flow rate on the...

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