Freeze/Thaw cycle effects on GDLs and MEAs of PEFC

동결/해동 열사이클이 PEFC의 GDL/MEA에 미치는 영향

  • 임남윤 (한국에너지기술연구원 고분자연료전지연구단) ;
  • 박구곤 (한국에너지기술연구원 고분자연료전지연구단) ;
  • 박진수 (한국에너지기술연구원 고분자연료전지연구단) ;
  • 윤영기 (한국에너지기술연구원 고분자연료전지연구단) ;
  • 이원용 (한국에너지기술연구원 고분자연료전지연구단) ;
  • 임태원 (한국에너지기술연구원 고분자연료전지연구단) ;
  • 김창수 (한국에너지기술연구원 고분자연료전지연구단)
  • Published : 2006.06.22

Abstract

Proper water management is vital to achieve high performance and durability of PEFC (Polymer Electrolyte Fuel Cell). The effects of the residual water from PEFC after purge in shut-down processes on GDL/MEAs were investigated with freeze/thaw cycles Freeze/thaw cycle tests were conducted with single cells which were designed from transparent acryl plates. Single cells which contain several amount of residual water were cycles from $80^{\circ}C$ to $-28^{\circ}C$. The resistance changes of the single cells which have various amount of residual water were evaluated by ac-impedance analysis with 24 times of freeze/thaw cycles. Also, after the freeze/thaw cycles, the property changes were characterized by visual methods such as SEM, EPMA. Though it was difficult to observe noticeable property changes in the visual characterizations, the resistance of cells dramatically increased with the amount of remained water.

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