High-Temperature Co-electrolysis of Carbon Dioxide and Steam for the Production of Syngas; Equilibrium Model and Single-Cell Tests
An experimental study has been completed to assess the performance of single solid-oxide electrolysis cells operating over a temperature range of 800 to 850ºC 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. Area-specific resistance values were similar for steam electrolysis and coelectrolysis.
- Research Organization:
- Idaho National Lab. (INL), Idaho Falls, ID (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- DE-AC07-99ID-13727
- OSTI ID:
- 912908
- Report Number(s):
- INL/CON-07-12102; TRN: US0800607
- Resource Relation:
- Conference: International Topical Meeting on the Safety and Technology of Nuclear Hydrogen,Boston, MA,06/24/2007,06/28/2007
- Country of Publication:
- United States
- Language:
- English
Similar Records
SYNGAS PRODUCTION VIA HIGH-TEMPERATURE COELECTROLYSIS OF STEAM AND CARBON DIOXIDE
SYNGAS PRODUCTION VIA HIGH-TEMPERATURE CO-ELECTROLYSIS OF STEAM AND CARBON DIOXIDE IN A SOLID-OXIDE STACK