Temperature dependence of the water distribution inside a Nafion membrane in an operating polymer electrolyte fuel cell. A micro-Raman study

Masanori Hara, Junji Inukai, Kenji Miyatake, Hiroyuki Uchida, Masahiro Watanabe*

*この研究の対応する著者

研究成果: Article査読

28 被引用数 (Scopus)

抄録

In situ confocal micro-Raman spectroscopy was used to probe the interior of the electrolyte membrane of a polymer electrolyte fuel cell (PEFC) at various temperatures (40-110 °C) and humidities (dry-90% RH). No changes in the Raman spectra for functional groups involved in the polymer were found under humidified and dry conditions, except for the sulfonic acid group. With increasing relative humidity, the band intensity for S-O stretching (ν(S-O)) in the latter increased, and the peak shifted toward lower wavenumber. By analyzing the Raman peaks, water distributions through the Nafion membrane thickness were successfully evaluated in the operating PEFC. It was found that the back-diffusion of water produced at the cathode to the anode, humidifying the membrane, was clearly detectable, and also the rate of water transport in the membrane increased with increasing cell temperature.

本文言語English
ページ(範囲)449-455
ページ数7
ジャーナルElectrochimica Acta
58
1
DOI
出版ステータスPublished - 2011 12 30
外部発表はい

ASJC Scopus subject areas

  • 化学工学(全般)
  • 電気化学

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