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Title: Polymer electrolyte fuel cell transport mechanisms: simulation study of hydrogen crossover and water content
Authors: Rama, Pratap
Liu, Yu
Chen, Rui
Issue Date: 2008
Publisher: © SAE International
Citation: RAMA, P., LIU, Y. and CHEN, R., 2008. Polymer electrolyte fuel cell transport mechanisms: simulation study of hydrogen crossover and water content. SAE International Powertrains, Fuels and Lubricants Congress, Shanghai, China, June 23-25, 2008.
Series/Report no.: SAE Technical Paper Series;2008-01-1802
Abstract: Hydrogen crossover and membrane hydration are significant issues for polymer electrolyte fuel cells (PEFC). Hydrogen crossover amounts to a quantity of unspent fuel, thereby reducing the fuel efficiency of the cell, but more significantly it also gives rise to the formation of hydrogen peroxide in the cathode catalyst layer which acts to irreversibly degenerate the polymer electrolyte. Membrane hydration not only strongly governs the performance of the cell, most noticeable through its effect on the ionic conductivity of the membrane, it also influences the onset and propagation of internal degradation and failure mechanisms that curtail the reliability and safety of PEFCs. This paper focuses on how hydrogen crossover and membrane hydration are affected by; (a) characteristic cell geometries, and (b) operating conditions relevant to automotive fuel cells. The numerical study is based on the application of a general transport equation developed previously to model multi-species transport through discontinuous materials. The results quantify (1) the effectiveness of different practical mechanisms which can be applied to curtail the effects of hydrogen crossover in automotive fuel cells and (2) the implications on water content within the membrane.
Description: This is a conference paper, SAE Paper 2008-01-1802 [© 2008 SAE International]. This paper is posted on this site with permission from SAE International. As a user of this site, you are permitted to view this paper on-line, and print one copy of this paper at no cost for your use only. This paper may not be copied, distributed or forwarded to others for further use without permission from SAE. This paper is also available from: http://www.sae.org/
Version: Published
URI: https://dspace.lboro.ac.uk/2134/5979
ISSN: 0148-7191
Appears in Collections:Conference Papers and Contributions (Aeronautical and Automotive Engineering)

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