Differences in drying/wetting water transfer resistance through a platinum catalyst layer of a PEMFC electrode membrane

Kuniyasu Ogawa, Tomoyuki Haishi, Kohei Itoc

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In order to understand the water transport phenomenon in a membrane electrode assembly (MEA), the water transfer resistance through a platinum catalyst layers (CL) is required. In this study, the overall water transfer resistance through the CL is taken as the sum of the resistance to charge/discharge water from the surface of ionomer in the CL and the resistance for water to pass through the ionomer in the CL. The value of this quantity for a CL that is 4 [im thick and is coated on a 178 [im thick Nation 117, was estimated. The MEA was dried/wetted by supplying gas with controlled humidity to the surface of the MEA. The water concentration contained in the PEM was measured by nuclear magnetic resonance (NMR) using a small detection coil. The rates of drying/wetting of the MEA were calculated from time-dependent changes of the water concentration measured in the PEM. The overall water transfer resistance through a CL was estimated by comparing experiment and analytical results based on the analytical model. As a result, the overall water transfer resistances through the 4 [im thick CL during drying and wetting were 0-3 x 104 and 10 ± 6 x 104 s/m, respectively.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume161
Issue number3
DOIs
Publication statusPublished - 2014

Fingerprint

Proton exchange membrane fuel cells (PEMFC)
Platinum
drying
wetting
Wetting
Drying
platinum
membranes
Membranes
catalysts
Electrodes
Catalysts
electrodes
Water
water
assembly
Ionomers
supplying
humidity
Analytical models

ASJC Scopus subject areas

  • Electrochemistry
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics

Cite this

Differences in drying/wetting water transfer resistance through a platinum catalyst layer of a PEMFC electrode membrane. / Ogawa, Kuniyasu; Haishi, Tomoyuki; Itoc, Kohei.

In: Journal of the Electrochemical Society, Vol. 161, No. 3, 2014.

Research output: Contribution to journalArticle

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