Measurement of effective gas diffusion coefficients of catalyst layers of PEM fuel cells with a Loschmidt diffusion cell

Download
  1. (PDF, 485 KB)
  2. Get@NRC: Measurement of effective gas diffusion coefficients of catalyst layers of PEM fuel cells with a Loschmidt diffusion cell (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1016/j.jpowsour.2010.07.086
AuthorSearch for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for:
TypeArticle
Journal titleJournal of Power Sources
Volume196
Issue2
Pages674678; # of pages: 5
SubjectEffective gas diffusion coefficient; Cathode catalyst layer; PEM fuel cells; Knudsen effect; Loschmidt diffusion cell
AbstractIn this work, using an in-house made Loschmidt diffusion cell, we measure the effective coefficient of dry gas (O₂–N₂) diffusion in cathode catalyst layers of PEM fuel cells at 25 °C and 1 atmosphere. The thicknesses of the catalyst layers under investigation are from 6 to 29μm. Each catalyst layer is deposited on an Al₂O₃ membrane substrate by an automated spray coater. Diffusion signal processing procedure is developed to deduce the effective diffusion coefficient, which is found to be (1.47±0.05)×10−⁷m² s−¹ for the catalyst layers. Porosity and pore size distribution of the catalyst layers are also measured using Hg porosimetry. The diffusion resistance of the interface between the catalyst layer and the substrate is found to be negligible. The experimental results show that the O₂–N₂ diffusion in the catalyst layers is dominated by the Knudsen effect.
Publication date
LanguageEnglish
AffiliationNRC Institute for Fuel Cell Innovation; National Research Council Canada
Peer reviewedYes
NPARC number16869218
Export citationExport as RIS
Report a correctionReport a correction
Record identifierd4b34abd-9735-40bd-8e34-100e4e3f6f98
Record created2011-02-15
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)