Measuring the current distribution in PEFCs with sub-millimeter resolution

S.A. Freunberger, M. Reum, J. Evertz, A. Wokaun, F.N. Büchi, Journal of The Electrochemical Society 153 (2006) A2158.

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Journal Article | Published | English
Author
Freunberger, Stefan AlexanderIST Austria ; Reum, Mathias; Evertz, Jörg; Wokaun, Alexander; Büchi, Felix N.
Abstract
An experimental technique for measuring the current density distribution with a resolution smaller than the channel/rib scale of the flow field in polymer electrolyte fuel cells (PEFCs) is presented. The electron conductors in a plane perpendicular to the channel direction are considered as two-dimensional resistors. Hence, the current density is obtained from the solution of Laplace's equation with the potentials at current collector and reaction layer as boundary conditions. Using ohmic drop for calculating the local current, detailed knowledge of all resistances involved is of prime importance. In particular, the contact resistance between the gas diffusion layer (GDL) and flow field rib, as well as GDL bulk conductivity, are strongly dependent on clamping pressure. They represent a substantial amount of the total ohmic drop and therefore require careful consideration. The detailed experimental setup as well as the concise procedure for quantitative data evaluation is described. Finally, the method is applied successfully to a cell operated on pure oxygen and air up to high current densities. The results show that electrical and ionic resistances seem to govern the current distribution at low current regimes, whereas mass transport limitations locally hamper the current production at high loads.
Publishing Year
Date Published
2006-09-20
Journal Title
Journal of The Electrochemical Society
Volume
153
Issue
11
Article Number
A2158
ISSN
IST-REx-ID

Cite this

Freunberger SA, Reum M, Evertz J, Wokaun A, Büchi FN. Measuring the current distribution in PEFCs with sub-millimeter resolution. Journal of The Electrochemical Society. 2006;153(11):A2158. doi:10.1149/1.2345591
Freunberger, S. A., Reum, M., Evertz, J., Wokaun, A., & Büchi, F. N. (2006). Measuring the current distribution in PEFCs with sub-millimeter resolution. Journal of The Electrochemical Society, 153(11), A2158. https://doi.org/10.1149/1.2345591
Freunberger, Stefan Alexander, Mathias Reum, Jörg Evertz, Alexander Wokaun, and Felix N. Büchi. “Measuring the Current Distribution in PEFCs with Sub-Millimeter Resolution.” Journal of The Electrochemical Society 153, no. 11 (2006): A2158. https://doi.org/10.1149/1.2345591.
S. A. Freunberger, M. Reum, J. Evertz, A. Wokaun, and F. N. Büchi, “Measuring the current distribution in PEFCs with sub-millimeter resolution,” Journal of The Electrochemical Society, vol. 153, no. 11, p. A2158, 2006.
Freunberger SA, Reum M, Evertz J, Wokaun A, Büchi FN. 2006. Measuring the current distribution in PEFCs with sub-millimeter resolution. Journal of The Electrochemical Society. 153(11), A2158.
Freunberger, Stefan Alexander, et al. “Measuring the Current Distribution in PEFCs with Sub-Millimeter Resolution.” Journal of The Electrochemical Society, vol. 153, no. 11, The Electrochemical Society, 2006, p. A2158, doi:10.1149/1.2345591.

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