In situ accelerated degradation of gas diffusion layer in proton exchange membrane fuel cell Part I: Effect of elevated temperature and flow rate

Download
  1. (PDF, 835 KB)
  2. Get@NRC: In situ accelerated degradation of gas diffusion layer in proton exchange membrane fuel cell Part I: Effect of elevated temperature and flow rate (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1016/j.jpowsour.2009.10.022
AuthorSearch for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for:
TypeArticle
Journal titleJournal of Power Sources
Volume195
Issue7
Pages18881894; # of pages: 6
SubjectProton exchange membrane fuel cell; Gas diffusion layer; Barrier; In situ; Degradation mechanism; Material loss
AbstractPast studies have shown that both the substrate and microporous layer of the gas diffusion layer (GDL) significantly affect water balance and performance of a proton exchange membrane (PEM) fuel cell. However, little effort has been made to investigate the importance of GDL properties on the durability of PEM fuel cells. In this study, the in situ degradation behaviour of a commercial GDL carbon fiber paper with MPL was investigated under a combination of elevated temperature and elevated flow rate conditions. To avoid the possible impact of the catalyst layer during degradation test, different barriers without catalyst were utilized individually to isolate the anode and cathode GDLs. Three different barriers were evaluated on their ability to isolate GDL degradation and their similarity to a fuel cell environment, and finally a novel Nafion/MPL/polyimide barrier was chosen. Characterization of the degraded GDL samples was conducted through the use of various diagnostic methods, including through-plane electrical resistivity measurements, mercury porosimetry, relative humidity sensitivity, and single-cell performance curves. Noticeable decreases in electrical resistivity and the hydrophobic properties were detected for the degraded GDL samples. The experimental results suggested that material loss plays an important role in GDL degradation mechanisms, while excessive mechanical stress prior to degradation weakens the GDL structure and changes its physical property, which consequently accelerates the material loss of the GDL during aging.
Publication date
LanguageEnglish
AffiliationNRC Institute for Fuel Cell Innovation; National Research Council Canada
Peer reviewedYes
NPARC number16910708
Export citationExport as RIS
Report a correctionReport a correction
Record identifier41b3d2cf-7aa8-4957-9395-fe38fd61f958
Record created2011-02-25
Record modified2016-05-09
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)