Performance of the polymer electrolyte membranes impregnated with some room-temperature ionic liquids at elevated temperature

Arata Goto, Yusuke Kawagoe, Yasushi Katayama, Takashi Miura

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The Nafion membrane impregnated with various room-temperature ionic liquids have been prepared and characterized as the electrolytes for polymer electrolyte fuel cells (PEFCs) operated at elevated temperature (100 200°C). The continuous proton transportation in the membrane was confirmed under dry hydrogen atmosphere at 160t. The ionic conductivity of the membrane was determined by both DC and AC measurements under dry hydrogen atmosphere and found to reach the order of 10-2 S cm-1 at 2001 without humidification. It is suggested that the high ionic conductivity of the membrane is caused mainly by free ionic liquids in the membranes. The continuous operation of the PEFC using the membrane was found to be possible without humidification at 120°C. However, the overpotential at the cathode was found to be large compared with the anode probably due to the sluggish electrode reaction and/or the slow diffusion of HTFSI in the membranes.

Original languageEnglish
Pages (from-to)231-237
Number of pages7
JournalElectrochemistry
Volume75
Issue number2
DOIs
Publication statusPublished - 2007 Feb

Keywords

  • Ionic liquid
  • PEFCs
  • Polymer electrolyte

ASJC Scopus subject areas

  • Electrochemistry

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