Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/6442
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Title: Electrolytic effect in solid oxide fuel cells running on steam/methane mixture
Authors: Ni, M 
Issue Date: 15-Feb-2011
Source: Journal of power sources, 15 Feb. 2011, v. 196, no. 4, p. 2027-2036
Abstract: A two-dimensional model is developed to study the performance of a planar solid oxide fuel cell (SOFC) running on steam/methane mixture. The model considers the heat/mass transfer, electrochemical reactions, direct internal reforming of methane (CH₄), and water gas shift reaction in an SOFC. It is found that at an operating potential of 0.8 V, the upstream and downstream of SOFC work in electrolysis and fuel cell modes, respectively. At the open-circuit voltage, the electricity generated by the downstream part of SOFC is completely consumed by the upstream through electrolysis, which is contrary to our common understanding that electrochemical reactions cease under the open-circuit conditions. In order to inhibit the electrolytic effect, the SOFC can be operated at a lower potential or use partially pre-reformed CH₄ as the fuel. Increasing the inlet gas velocity from 0.5 m s⁻¹ to 5.0 m s⁻¹ does not reduce the electrolytic effect but decreases the SOFC performance.
Keywords: Solid oxide fuel cells
Internal reforming
Electrochemistry
Porous media
Natural gas
Electrolysis
Publisher: Elsevier
Journal: Journal of power sources 
ISSN: 0378-7753
EISSN: 1873-2755
DOI: 10.1016/j.jpowsour.2010.09.069
Rights: © 2010 Elsevier B.V. All rights reserved.
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. 196, no. 4 (Feb 2011), DOI: 10.1016/j.jpowsour.2010.09.069
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