Numerical Study of Heterogeneous Reactions in an SOFC Anode with Oxygen Addition
- Creators
- Hao, Yong
- Goodwin, David G.
Abstract
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.
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.Files
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Additional details
- Eprint ID
- 10491
- Resolver ID
- CaltechAUTHORS:HAOjes08
- Created
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2008-05-09Created from EPrint's datestamp field
- Updated
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2021-11-08Created from EPrint's last_modified field