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Title: Impedance study on oxygen diffusion through fuel cell cathode catalyst layer at high current
Authors: Cruz-Manzo, Samuel
Rama, Pratap
Chen, Rui
Issue Date: 2010
Publisher: © Electrochemical Society
Citation: CRUZ-MANZO, S., RAMA, P. and CHEN, R., 2010. Impedance study on oxygen diffusion through fuel cell cathode catalyst layer at high current. Journal of the Electrochemical Society, 157 (12), pp. B1865 - B1871.
Abstract: A mathematical model to simulate the electrochemical impedance spectrum in the frequency domain and the current distribution in the time domain of polymer electrolyte fuel cell cathode catalyst layer CCL operated at high currents has been developed. In the model, Fick’s second law in the frequency domain is solved to define oxygen distribution through CCL. The rate of oxygen transportation and proton conductivity are related to the current distribution equation reported in the authors’ previous study for low current operations. The model, compared against the frequency response of an experimental impedance spectrum, is then converted into the time domain using the inverse Laplace transform method. The results show the nonsteady oxygen diffusion in the CCL which allows equilibrium to be established between the bulk concentration supplied at the gas diffusion layer boundary and the surface concentration of the oxygen within the CCL. The developed model can be applied to unveil the effect of kinetic, ohmic, and mass transport mechanisms on current distribution through the thickness of the CCL from the measured impedance results.
Description: This article was accepted for publication in the Journal of the Electrochemical Society [© Electrochemical Society]. The definitive version is available at: http://dx.doi.org/10.1149/1.3502569
Sponsor: The authors thank the Mexican National Council for Science and Technology CONACYT for the sponsorship of the Ph.D research study of S. Cruz-Manzo Grant no. 183195 . Loughborough University assisted in meeting the publication costs of this article.
Version: Accepted for publication
DOI: 10.1149/1.3502569
URI: https://dspace.lboro.ac.uk/2134/18547
Publisher Link: http://dx.doi.org/10.1149/1.3502569
ISSN: 0013-4651
Appears in Collections:Published Articles (Aeronautical and Automotive Engineering)

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