Micro-Raman study on water distribution inside a Nafion membrane during operation of polymer electrolyte fuel cell

Masanori Hara, Junji Inukai, Byungchan Bae, Takayuki Hoshi, Kenji Miyatake, Makoto Uchida, Hiroyuki Uchida, Masahiro Watanabe

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

In situ confocal micro-Raman spectroscopy was used to probe the water distribution in an electrolyte membrane in a polymer electrolyte fuel cell (PEFC) under various cell-operating conditions. The water content, λ R (number of water molecules per sulfonic acid group), in a Nafion ® membrane was calculated from the intensity of the OH stretching (ν(OH)) band. By analyzing the Raman spectra as a function of the membrane depth in an operating PEFC, the λ R distributions in the membrane were obtained under different temperature, humidification, current density and gas-flow rate conditions. The ν(OH) intensity in the electrolyte membrane increased with increasing current density, relative humidity, and gas utilization. The water distribution in the electrolyte membrane can be understood as a balance among back-diffusing water produced from the cathode, electro-osmotic drag, and water removal via the gas diffusion layer (GDL), all of which is information that will be important for the realization of cell operation without humidification in future advanced fuel cell vehicles.

Original languageEnglish
Pages (from-to)277-283
Number of pages7
JournalElectrochimica Acta
Volume82
DOIs
Publication statusPublished - 2012 Nov 1
Externally publishedYes

Keywords

  • Fuel cell vehicle
  • MEA
  • Micro-Raman spectroscopy
  • Nafion
  • Water distribution

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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