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Numerical Study of Heterogeneous Reactions in an SOFC Anode With Oxygen Addition

Hao, Yong and Goodwin, David G. (2007) Numerical Study of Heterogeneous Reactions in an SOFC Anode With Oxygen Addition. In: Solid oxide fuel cells 10 : (SOFC-X). ECS Transactions . No.7. Electrochemical Society , Pennington, NJ, pp. 1859-1867. ISBN 978-1-56677-554-0.

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Previous experimental studies have shown that addition of smallamounts of oxygen to a hydrocarbon fuel stream can controlcoking in the anode, while relatively large amounts of oxygenare present in the fuel stream in single-chamber SOFCs. Inorder to rationally design an anode for such use, it isimportant to understand the coupled catalytic oxidation /reforming chemistry and diffusion within the anode under SOFCoperating conditions. In this study, the heterogeneous catalyticreactions in the anode of an anode-supported SOFC running onmethane fuel with added oxygen are numerically investigated,using a model that accounts for catalytic chemistry, porousmedia transport, and electrochemistry at the anode/electrolyteinterface. Using an experimentally validated heterogeneousreaction mechanism for methane partial oxidation and reformingon nickel, we identify three distinct reaction zones atdifferent depths within the anode: a thin outer layer in whichoxygen is nearly fully consumed in oxidizing methane andhydrogen, followed by a reforming region, then a water-gas shiftregion deep within the anode. Based on these insights into thechemistry, the possibility of a composite anode with differentlayers of metal catalysts is also explored for the improvementof fuel cell performance.

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Additional Information:© 2007 Electrochemical Society. This work was partly supported by the Defense Advanced Research Projects Agency (DARPA) under grant N66001-01-1-8966 and partly by the Office of Naval Research under grant N00014-05-1-0339. We greatly appreciate the constructive suggestions from S. M. Haile, Z. Shao, C. Pantano, W. Lai and J. Mederos.
Funding AgencyGrant Number
Defense Advanced Research Projects Agency (DARPA)N66001-01-1-8966
Office of Naval Research (ONR)N00014-05-1-0339
Series Name:ECS Transactions
Issue or Number:7
Record Number:CaltechAUTHORS:20100917-100425322
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Official Citation:Numerical Study of Heterogeneous Reactions in an SOFC Anode With Oxygen Addition Yong Hao and David G. Goodwin, ECS Trans. 7, 1859 (2007), DOI:10.1149/1.2729298
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:20011
Deposited By: Tony Diaz
Deposited On:17 Sep 2010 21:40
Last Modified:08 Nov 2021 23:56

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