대형 상용차용 PEMFC 스택 내구성은 승용차용보다 5배 이상 되어야 한다. 승용차용 PEMFC 고분자막의 화학적 가속 내구성 평가(AST)를 대형 상용차용에 그대로 적용하면 AST 시간이 2,500시간 이상이 되는 문제점이 있다. DOE(Department of Energy)의 AST 시간을 단축시키기 위해 Cathode 가스로 공기대신 산소를 사용하여 고분자막의 화학적 내구성을 평가하였다. 본 연구에서는 Nafion XL을 고분자막으로 사용해 OCV, 90 oC, RH 30%, H2 (Anode), 공기 또는 산소조건으로 가속 내구성을 평가하였다. DOE 내구 목표 기준 중 Short 저항 감소가 제일 빨리 나타났다. 공기대신 산소를 사용함으로써 전극 열화의 영향을 적게 받으면서, 고분자막의 열화 속도를 가속화시켜 고분자막 내구성평가시간을 절반 이하로 단축시켰다.

The durability of the PEMFC stack for large commercial vehicles should be more than 5 times that for passenger vehicles. If the Chemical Accelerated Stress Test (AST) of PEMFC(Proton Exchange Membrane Fuel Cells) membrane for passenger cars is applied as it is for large commercial vehicles, there is a problem that the AST time becomes more than 2,500 hours. In order to shorten the AST time of DOE (Department of Energy), the chemical durability of the polymer membrane was evaluated using oxygen instead of air as a cathode gas. In this study, Nafion XL was used as a polymer membrane to evaluate accelerated durability under OCV, 90?, RH 30%, H2/(air or oxygen) conditions. Among the DOE membrane durability target criteria, the decrease rate of short resistance was the fastest. By using oxygen instead of air, the degradation rate of the polymer membrane was accelerated while being less affected by electrode deterioration, reducing the polymer membrane durability evaluation time to less than half.

PEMFC Membrane Durability AST Chemical degradation

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