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Title: Elementary reaction modeling and experimental characterization of solid oxide fuel-assisted steam electrolysis cells
Authors: Luo, Y
Shi, YX
Li, WY
Ni, M 
Cai, NS
Issue Date: Jul-2014
Source: International journal of hydrogen energy, 2014, v. 39, no. 20, p. 10359-10373
Abstract: A one-dimensional elementary reaction kinetic model for solid oxide fuel-assisted steam electrolysis cell (SOFEC) is developed coupling heterogeneous elementary reactions, electrochemical reaction kinetics, electrode microstructure and transport processes of charge and mass. This model is calibrated and validated by experimental data from a button cell with anode gases of H-2, CO and CH4 at 800 degrees C. After comparisons with solid oxide electrolysis cell (SOEC), the energy demands, performance and efficiency of CO-assisted SOFEC and CH4-assisted SOFEC are investigated numerically. One important finding is that over 80% of electricity can be saved by SOFEC at a current density of 3000 A m(-2). SOFEC assisted by CO or CH4 for steam electrolysis has better performance than SOEC, especially by CH4. The efficiencies of 12% CO-SOFEC and 12% CH4-SOFEC are at least, respectively, 7% and 30% higher than that of SOEC at 800 degrees C with the current density of below 2500 A m(-2). Finally, the effects of type of assisting-fuel, fuel composition and applied voltage are studied. It is found that CO-SOFEC shows higher anode polarization and thus lower performance than CH4-SOFEC with the same molar fraction of fuel. It is also found that the performance of SOFEC increases with increasing proportion of assisted fuel in anode at high current density.
Keywords: Solid oxide fuel-assisted electrolysis cell (SOFEC)
Lower open-circuit voltage (OCV)
Elementary reaction model
Carbon monoxide
Publisher: Pergamon Press
Journal: International journal of hydrogen energy 
ISSN: 0360-3199
EISSN: 1879-3487
DOI: 10.1016/j.ijhydene.2014.05.018
Rights: Copyright © 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
NOTICE: this is the author’s version of a work that was accepted for publication in International Journal of Hydrogen Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. The definitive version Luo, Y., Shi, Y., Li, W., Ni, M., & Cai, N. (2014). Elementary reaction modeling and experimental characterization of solid oxide fuel-assisted steam electrolysis cells. International Journal of Hydrogen Energy, 39(20), 10359-10373 is available at
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