Electrochemical diffusimetry of fuel cell gas diffusion layers

Kramer D, Freunberger SA, Flückiger R, Schneider IA, Wokaun A, Büchi FN, Scherer GG. 2008. Electrochemical diffusimetry of fuel cell gas diffusion layers. Journal of Electroanalytical Chemistry. 612(1), 63–77.

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Journal Article | Published | English
Author
Kramer, Denis; Freunberger, Stefan AlexanderIST Austria ; Flückiger, Reto; Schneider, Ingo A.; Wokaun, Alexander; Büchi, Felix N.; Scherer, Günther G.
Abstract
The gas diffusion layers (GDLs) of a membrane electrode assembly (MEA) serve as link between flow field and porous electrode within a polymer electrolyte fuel cell. Beside ensuring sufficient electrical and thermal contact between the whole electrode area and the flow field, these typically 200–400 μm thick porous structures enable the access of educts to the electrode area which would be occluded by the flow field lands if the flow field is directly attached to the electrode. Hence, the characterisation of properties pertaining to mass transport of educts and products through these structures is indispensable whilst examining the contribution of the GDLs to the overall electrochemical characteristics of a MEA. A fast and cost effective method to measure the effective diffusivity of a GDL is presented. Electrochemical impedance spectroscopy is applied to measure the effective ionic conductivity of an electrolyte-soaked GDL. Taking advantage of the analogy between Ficks and Ohms law, this provides a measure for the effective diffusivity. The method is described in detail, including experimental as well as theoretical aspects, and selected results, highlighting the anisotropy and dependence on the degree of compression, are shown. Moreover, a two-dimensional model consisting of regularly spaced ellipses is developed to represent the porous structure of the GDL, and by using conformal maps, the agreement between this model and experiment with respect to the sensitivity of the effective diffusivity towards compression is shown.
Publishing Year
Date Published
2008-01-01
Journal Title
Journal of Electroanalytical Chemistry
Volume
612
Issue
1
Page
63-77
ISSN
IST-REx-ID

Cite this

Kramer D, Freunberger SA, Flückiger R, et al. Electrochemical diffusimetry of fuel cell gas diffusion layers. Journal of Electroanalytical Chemistry. 2008;612(1):63-77. doi:10.1016/j.jelechem.2007.09.014
Kramer, D., Freunberger, S. A., Flückiger, R., Schneider, I. A., Wokaun, A., Büchi, F. N., & Scherer, G. G. (2008). Electrochemical diffusimetry of fuel cell gas diffusion layers. Journal of Electroanalytical Chemistry. Elsevier. https://doi.org/10.1016/j.jelechem.2007.09.014
Kramer, Denis, Stefan Alexander Freunberger, Reto Flückiger, Ingo A. Schneider, Alexander Wokaun, Felix N. Büchi, and Günther G. Scherer. “Electrochemical Diffusimetry of Fuel Cell Gas Diffusion Layers.” Journal of Electroanalytical Chemistry. Elsevier, 2008. https://doi.org/10.1016/j.jelechem.2007.09.014.
D. Kramer et al., “Electrochemical diffusimetry of fuel cell gas diffusion layers,” Journal of Electroanalytical Chemistry, vol. 612, no. 1. Elsevier, pp. 63–77, 2008.
Kramer D, Freunberger SA, Flückiger R, Schneider IA, Wokaun A, Büchi FN, Scherer GG. 2008. Electrochemical diffusimetry of fuel cell gas diffusion layers. Journal of Electroanalytical Chemistry. 612(1), 63–77.
Kramer, Denis, et al. “Electrochemical Diffusimetry of Fuel Cell Gas Diffusion Layers.” Journal of Electroanalytical Chemistry, vol. 612, no. 1, Elsevier, 2008, pp. 63–77, doi:10.1016/j.jelechem.2007.09.014.

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