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

Hao, Yong and Goodwin, David G. (2008) Numerical Study of Heterogeneous Reactions in an SOFC Anode with Oxygen Addition. Journal of the Electrochemical Society, 155 (7). B666-B674. ISSN 0013-4651. doi:10.1149/1.2907763.

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Previous experimental studies have shown that addition of small amounts of oxygen to a hydrocarbon fuel stream can control coking in the anode, while relatively large amounts of oxygen are present in the fuel stream in single-chamber solid oxide fuel cells (SOFCs). In order to rationally design an anode for such use, it is important to understand the coupled catalytic oxidation/reforming chemistry and diffusion within the anode under SOFC operating conditions. In this study, the heterogeneous catalytic reactions in the anode of an anode-supported SOFC running on methane fuel with added oxygen are numerically investigated using a model that accounts for catalytic chemistry, porous media transport, and electrochemistry at the anode/electrolyte interface. Using an experimentally validated heterogeneous reaction mechanism for methane partial oxidation and reforming on nickel, we identify three distinct reaction zones at different depths within the anode: a thin outer layer in which oxygen is nearly fully consumed in oxidizing methane and hydrogen, followed by a reforming region, and then a water–gas shift region deep within the anode. Both single-chamber and dual-chamber SOFC anodes are explored.

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Additional Information:©2008 The Electrochemical Society. (Revised 18 March 2008; published 2 May 2008) This work was partly supported by the Defense Advanced Research Projects Agency (DARPA) under grant no. N66001-01-1-8966 and partly by the Office of Naval Research under grant no. N00014-05-1-0339. We greatly appreciate the constructive suggestions from S.M. Haile, Z. Shao, C. Pantano, W. Lai, and J. Mederos. California Institute of Technology assisted in meeting the publication costs of this article.
Subject Keywords:association; catalysis; diffusion; electrochemical electrodes; electrochemistry; electrolytes; organic compounds; oxidation; oxygen; reaction kinetics theory; solid oxide fuel cells
Issue or Number:7
Record Number:CaltechAUTHORS:HAOjes08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10491
Deposited By: Archive Administrator
Deposited On:09 May 2008
Last Modified:08 Nov 2021 21:08

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