Low equivalent weight short-side-chain perfluorosulfonic acid ionomers in fuel cell cathode catalyst layers

Download
  1. (PDF, 1 MB)
  2. Get@NRC: Low equivalent weight short-side-chain perfluorosulfonic acid ionomers in fuel cell cathode catalyst layers (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1016/j.jpowsour.2011.03.024
AuthorSearch for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for:
TypeArticle
Journal titleJournal of Power Sources
Volume196
Issue15
Pages61686176; # of pages: 9
Subjectfuel cell; catalyst layer; short-side-chain ionomer; MEA; equivalent weight
AbstractThe morphology and fuel cell performance of cathode catalyst layers (CCLs) using low equivalent weight (EW) short-side-chain (SSC) perfluorosulfonic acid ionomers have been investigated in this work. The results were compared with those for a baseline CCL containing 30 wt% of the conventional ionomer 1100 EW Nafion®. The CCLs fabricated with 10–20 wt% of the AquivionTM ionomer displayed a similar morphology to the Nafion®-based CCLs. Electrochemical surface areas (ECSA) and double layer capacitances of all the AquivionTM-based samples were similar to those of the baseline. The oxygen reduction reaction (ORR) kinetics in CCLs with 20 wt% and 30 wt% AquivionTM were lower than the baseline under 100% relative humidity (RH), yet similar to the baseline at 70% RH. In situ electrochemical impedance spectroscopy (EIS) measurements suggested that the lowered ORR kinetics at 100% RH may be attributed to the large mass transport resistance in AquivionTM-based samples at low current densities. Relative to the baseline, CCLs containing 20 wt% AquivionTM ionomer demonstrated an improvement in fuel cell performance under operating conditions of 95 ◦C and RH values of 30, 50 and 70%. The greater hydrophilicity of the SSC ionomers is believed to account for the improved fuel cell performance at the relatively higher operating temperature and dry conditions.
Publication date
LanguageEnglish
AffiliationNRC Institute for Fuel Cell Innovation; National Research Council Canada
Peer reviewedYes
NPARC number19589005
Export citationExport as RIS
Report a correctionReport a correction
Record identifier5f48731f-a5d8-4734-b637-8f903366b0f6
Record created2012-03-03
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)