Cell interaction phenomena in polymer electrolyte fuel cell stacks
Freunberger SA, Schneider IA, Sui P-C, Wokaun A, Djilali N, Büchi FN. 2008. Cell interaction phenomena in polymer electrolyte fuel cell stacks. Journal of The Electrochemical Society. 155(7), B704.
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Journal Article
| Published
| English
Author
Freunberger, Stefan AlexanderISTA ;
Schneider, Ingo A.;
Sui, Pang-Chieh;
Wokaun, Alexander;
Djilali, Nedjib;
Büchi, Felix N.
Abstract
Cell interaction phenomena in polymer electrolyte fuel cell stacks that arise from imbalance between adjacent cells are investigated in detail experimentally and theoretically. A specialized two-cell stack with advanced localized diagnostics was developed and used to analyze the mechanism and effect of cell-to-cell coupling as a result of operationally relevant variations in reactant feed flow. Contributions to overall and local voltage changes with respect to uniformly operated cells are scrutinized. Unequal operation of the cells causes in-plane current in the bipolar plate to redistribute current and result in inhomogeneous polarization. Both increasing and decreasing polarization along the air-flow path reduces cell power as compared to isopotential operation. A two-dimensional model based on a commercial computational fluid dynamics code is used to back and extend the experimental results to more general cases. Furthermore, the experimental setup presented allowed for the first time to perform simultaneous localized electrochemical impedance spectroscopy beyond the single-cell level. The mechanism of mutual cell interaction on local and integral spectra is revealed. Results show that virtually identical operation of the cells is essential to obtain meaningful integral spectra.
Publishing Year
Date Published
2008-05-08
Journal Title
Journal of The Electrochemical Society
Publisher
The Electrochemical Society
Volume
155
Issue
7
Article Number
B704
ISSN
IST-REx-ID
Cite this
Freunberger SA, Schneider IA, Sui P-C, Wokaun A, Djilali N, Büchi FN. Cell interaction phenomena in polymer electrolyte fuel cell stacks. Journal of The Electrochemical Society. 2008;155(7). doi:10.1149/1.2913095
Freunberger, S. A., Schneider, I. A., Sui, P.-C., Wokaun, A., Djilali, N., & Büchi, F. N. (2008). Cell interaction phenomena in polymer electrolyte fuel cell stacks. Journal of The Electrochemical Society. The Electrochemical Society. https://doi.org/10.1149/1.2913095
Freunberger, Stefan Alexander, Ingo A. Schneider, Pang-Chieh Sui, Alexander Wokaun, Nedjib Djilali, and Felix N. Büchi. “Cell Interaction Phenomena in Polymer Electrolyte Fuel Cell Stacks.” Journal of The Electrochemical Society. The Electrochemical Society, 2008. https://doi.org/10.1149/1.2913095.
S. A. Freunberger, I. A. Schneider, P.-C. Sui, A. Wokaun, N. Djilali, and F. N. Büchi, “Cell interaction phenomena in polymer electrolyte fuel cell stacks,” Journal of The Electrochemical Society, vol. 155, no. 7. The Electrochemical Society, 2008.
Freunberger SA, Schneider IA, Sui P-C, Wokaun A, Djilali N, Büchi FN. 2008. Cell interaction phenomena in polymer electrolyte fuel cell stacks. Journal of The Electrochemical Society. 155(7), B704.
Freunberger, Stefan Alexander, et al. “Cell Interaction Phenomena in Polymer Electrolyte Fuel Cell Stacks.” Journal of The Electrochemical Society, vol. 155, no. 7, B704, The Electrochemical Society, 2008, doi:10.1149/1.2913095.