Effect of through-plane distribution of polytetrafluoroethylene in carbon paper on in-plane gas permeability

Hiroshi Ito, Katsuya Abe, Masayoshi Ishida, Akihiro Nakano, Tetsuhiko Maeda, Tetsuo Munakata, Hironori Nakajima, Tatsumi Kitahara

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

In-plane permeability of gas diffusion backing (GDB) of proton exchange membrane fuel cells (PEMFCs) was investigated experimentally. Toray-paper and SGL-paper were selected as GDB test samples. Several Toray-papers were treated in-house with polytetrafluoroethylene (PTFE) using the immersion technique, dried either under atmospheric or vacuum pressure, and then sintered. The dependence of PTFE distribution in the through-plane direction on the PTFE drying conditions was examined using scanning electron microscopy (SEM)-based energy dispersive X-ray spectroscopy (EDS) imaging. The EDS image maps revealed that the PTFE distribution strongly depended on the drying condition, and PTFE drying under vacuum pressure yielded a relatively uniform PTFE distribution. The measured in-plane permeability suggests that the homogeneous distribution of PTFE achieved by the vacuum drying produces a porosity-leveling effect. In addition, the relationship between the in-plane permeability and porosity of the Toray-paper samples followed the Kozeny-Carman relation, whereas due to non-fibrous solids such as binder, that of the SGL-paper samples did not.

Original languageEnglish
Pages (from-to)822-830
Number of pages9
JournalJournal of Power Sources
Volume248
DOIs
Publication statusPublished - Jan 1 2014

Fingerprint

Gas permeability
polytetrafluoroethylene
Polytetrafluoroethylene
Polytetrafluoroethylenes
permeability
Carbon
carbon
drying
gases
Drying
gaseous diffusion
Diffusion in gases
backups
Vacuum
vacuum
Energy dispersive spectroscopy
Porosity
porosity
leveling
Proton exchange membrane fuel cells (PEMFC)

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Cite this

Effect of through-plane distribution of polytetrafluoroethylene in carbon paper on in-plane gas permeability. / Ito, Hiroshi; Abe, Katsuya; Ishida, Masayoshi; Nakano, Akihiro; Maeda, Tetsuhiko; Munakata, Tetsuo; Nakajima, Hironori; Kitahara, Tatsumi.

In: Journal of Power Sources, Vol. 248, 01.01.2014, p. 822-830.

Research output: Contribution to journalArticle

Ito, Hiroshi ; Abe, Katsuya ; Ishida, Masayoshi ; Nakano, Akihiro ; Maeda, Tetsuhiko ; Munakata, Tetsuo ; Nakajima, Hironori ; Kitahara, Tatsumi. / Effect of through-plane distribution of polytetrafluoroethylene in carbon paper on in-plane gas permeability. In: Journal of Power Sources. 2014 ; Vol. 248. pp. 822-830.
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