Degradation of a PEM fuel cell stack with Nafion® membranes of different thicknesses. Part II : Ex situ diagnosis

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DOIResolve DOI: http://doi.org/10.1016/j.jpowsour.2012.01.074
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TypeArticle
Journal titleJournal of Power Sources
Volume205
Pages324334; # of pages: 11
Subjectproton exchange membrane fuel cell; stack; ex situ; durability; idle conditions; degradation
AbstractPart I of this study carried out membrane electrode assembly degradation of a four-cell stack with Nafion membranes of different thicknesses, including N117, N115, NR212, and NR211, for 1000 h under idle conditions. Through on-line electrochemical measurements it was found that as degradation advanced, cells with thinner membranes experienced much more rapid performance degradation than those with thicker membranes, especially after 800 h of operation, due to a dramatic increase in hydrogen crossover. In the present work we investigate the degradation mechanisms of this four-cell stack using several ex situ diagnostic tools, including scanning electron microscopy (SEM), infrared (IR) imaging, ion chromatography (IC), gas permeability measurement, contact angle measurement, and simulation. The results indicate that the drastic increase in hydrogen crossover is due to membrane thickness loss and pinhole formation.
Publication date
LanguageEnglish
AffiliationNRC Institute for Fuel Cell Innovation; National Research Council Canada
Peer reviewedYes
NPARC number19547532
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Record identifier833eb7d8-d09f-437f-b1a6-26464513d027
Record created2012-02-24
Record modified2016-05-09
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