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Numerical Modeling of Single-Chamber SOFCs with Hydrocarbon Fuels

Hao, Y. and Goodwin, D. G. (2007) Numerical Modeling of Single-Chamber SOFCs with Hydrocarbon Fuels. Journal of the Electrochemical Society, 154 (2). B207-B217. ISSN 0013-4651. http://resolver.caltech.edu/CaltechAUTHORS:HAOjes07

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Abstract

A two-dimensional numerical model of a single-chamber solid oxide fuel cell (SCFC) operating on hydrocarbon fuels is developed. The SCFC concept is a simplification of a conventional solid oxide fuel cell in which the anode and cathode are both exposed to the same premixed fuel-air mixture, and selective catalysts promote electrochemical oxidation of the fuel at the anode and simultaneous electrochemical oxygen reduction at the cathode. Optimization of SCFC stacks requires considering complex, coupled chemical and transport processes. The model accounts for the coupled effects of gas channel fluid flow, heat transfer, porous media transport, catalytic reforming-shifting chemistry, electrochemistry, and mixed ionic-electronic conductivity. It solves for the velocity, temperature, and species distributions in the gas, profiles of gaseous species and coverages of surface species within the porous electrodes, and the current density profile in an SCFC stack for a specified electrical bias. The model is general, and can be used to simulate any electrode processes for which kinetics are known or may be estimated. A detailed elementary mechanism is used to describe the reactions over the anode catalyst surface. Different design alternatives including yttria-stabilized zirconia vs Ce0.8Sm0.2O1.9 electrolytes, the effects of mixed conductivity, and the optimal fuel-to-air ratio are explored.


Item Type:Article
Additional Information:©2006 The Electrochemical Society. (Revised 27 September 2006; published 22 December 2006) Available electronically December 22, 2006. 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. California Institute of Technology assisted in meeting the publication costs of this article.
Subject Keywords:yttrium compounds; zirconium compounds; cerium compounds; solid electrolytes; solid oxide fuel cells; electrochemical electrodes; anodes; cathodes; catalysts; oxidation; reduction (chemical); channel flow; heat transfer; mixed conductivity; ionic conductivity; current density; porous materials
Record Number:CaltechAUTHORS:HAOjes07
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:HAOjes07
Alternative URL:http://dx.doi.org/10.1149/1.2404895
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:7166
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:12 Jan 2007
Last Modified:26 Dec 2012 09:29

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