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
Pages (from-to)F239-F245
JournalJournal of the Electrochemical Society
Volume161
Issue number3
DOIs
Publication statusPublished - 2014 Feb 14

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Differences in drying/wetting water transfer resistance through a platinum catalyst layer of a PEMFC electrode membrane'. Together they form a unique fingerprint.

  • Cite this