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High-Temperature Co-Electrolysis of Steam and Carbon Dioxide for Direct Production of Syngas; Equilibrium Model and Single-Cell Tests.


DE2008924520

Publication Date 2007
Personal Author O'Brien, J. E.; Hartvigsen, J. J.; Stoots, C. M.; Herring, J. S.
Page Count 15
Abstract An experimental study has been completed to assess the performance of single solid-oxide electrolysis cells operating over a temperature range of 800 to 850 degrees C in the coelectrolysis mode, simultaneously electrolyzing steam and carbon dioxide for the direct production of syngas. The experiments were performed over a range of inlet flow rates of steam, carbon dioxide, hydrogen and nitrogen and over a range of current densities (-0.1 to 0.25 A/cm2) using single electrolyte-supported button electrolysis cells. Steam and carbon dioxide consumption rates associated with electrolysis were measured directly using inlet and outlet dewpoint instrumentation and a gas chromatograph, respectively. Cell operating potentials and cell current were varied using a programmable power supply. Measured values of open-cell potential and outlet gas composition are compared to predictions obtained from a chemical equilibrium coelectrolysis model. Model predictions of outlet gas composition based on an effective equilibrium temperature are shown to agree well with measurements. Cell area-specific resistance values were similar for steam electrolysis and coelectrolysis.
Keywords
  • Hydrogen
  • Electrolysis
  • Steam
  • Carbon dioxide
  • Fuels
  • Availability
  • Consumption rates
  • Solid oxide fuel cells
  • Flow rate
  • Fuel cells
  • Nitrogen
  • Syngas
  • Performance
  • Production
Source Agency
  • Technical Information Center Oak Ridge Tennessee
Corporate Authors Idaho National Engineering Lab., Idaho Falls.; Department of Energy, Washington, DC.
Supplemental Notes Sponsored by Department of Energy, Washington, DC.
Document Type Technical Report
NTIS Issue Number 200820
Contract Number
  • DE-AC07-99ID-13727
High-Temperature Co-Electrolysis of Steam and Carbon Dioxide for Direct Production of Syngas; Equilibrium Model and Single-Cell Tests.
High-Temperature Co-Electrolysis of Steam and Carbon Dioxide for Direct Production of Syngas; Equilibrium Model and Single-Cell Tests.
DE2008924520

  • Hydrogen
  • Electrolysis
  • Steam
  • Carbon dioxide
  • Fuels
  • Availability
  • Consumption rates
  • Solid oxide fuel cells
  • Flow rate
  • Fuel cells
  • Nitrogen
  • Syngas
  • Performance
  • Production
  • Technical Information Center Oak Ridge Tennessee
  • DE-AC07-99ID-13727
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