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Title: An electrochemical model for syngas production by co-electrolysis of H₂O and CO₂
Authors: Ni, M 
Issue Date: 15-Mar-2012
Source: Journal of power sources, 15 Mar. 2012, v. 202, p. 209-216
Abstract: Co-electrolysis of CO₂ and H₂O in a solid oxide electrolyzer cell (SOEC) offers a promising way for syngas production. In this study, an electrochemical model is developed to simulate the performance of an SOEC used for CO₂/H₂O co-electrolysis, considering the reversible water gas shift reaction (WGSR) in the cathode. The dusty gas model (DGM) is used to characterize the multi-component mass transport in the electrodes. The modeling results are compared with experimental data from the literature and good agreement is observed. Parametric simulations are performed to analyze the distributions of WGSR and gas composition in the electrode. A new method is proposed to quantify the contribution of WGSR to CO production by comparing the CO fluxes at the cathode–electrolyte interface and at the cathode surface. It is found that the reversible WGSR could contribute to CO production at a low operating potential but consume CO at a high operating potential at an operating temperature of 1073 K and inlet gas composition (molar fraction) of H₂O: 49.7%, CO₂: 25%, H₂: 25%, CO: 0.3%. In addition, the contribution of WGSR to CO production also depends on the operating temperature and inlet gas composition.
Keywords: Solid oxide fuel cell
Co-electrolysis
Synthetic fuel
Mass transfer
Porous media
Modeling
Publisher: Elsevier
Journal: Journal of power sources 
ISSN: 0378-7753
EISSN: 1873-2755
DOI: 10.1016/j.jpowsour.2011.11.080
Rights: Journal of power sources © 2011 Elsevier B.V. All rights reserved. The journal web site is located at http://www.sciencedirect.com.
NOTICE: this is the author’s version of a work that was accepted for publication in Journal of power sources. 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. A definitive version was subsequently published in Journal of power sources, vol. 202(15 Mar 2012), p. 209–216, DOI: 10.1016/j.jpowsour.2011.11.080
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