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Korean Chemical Engineering Research,
Vol.53, No.4, 412-416, 2015
Vol.53, No.4, 412-416, 2015
고분자전해질 연료전지 구동 중 수소투과도 측정
Measurement of Hydrogen Crossover During PEMFC Operation
고분자 막 성능 평가 및 내구성 평가에 이용하기 위해 고분자전해질 연료전지(PEMFC) 구동 중에 수소 크로스오버측정이 필요하다. 수소 크로스오버 측정 시에 불활성 기체 대신에 공기를 cathode에 공급하면서 기체 크로마토그래프로 수소 농도를 cathode 출구에서 분석하였다. PEMFC 구동 중 고분자 막을 통과한 수소는 cathode에서 산소와 반응해 불활성 가스를 공급할 때에 비해 수소 농도가 감소하였다. cathode 공기 공급 유량이 증가하면 수소 농도가 감소했고, 셀의 온도와 습도, 압력이 증가하면 cathode의 수소 농도는 증가했다. 일반적인 PEMFC 구동 조건에서 120 mA/cm2 전류밀도에서 수소농도는 약 5.0 ppm이었다.
To evaluate the performance and durability of membrane, measurement of hydrogen crossover is needed during PEMFC(Proton Exchange Membrane Fuel Cells) operation. In this work, concentration of hydrogen at cathode was analysed by gas chromatograph during operation suppling with air instead of inert gas into the cathode. The hydrogen permeated through membrane reacted with oxygen at cathode and then the concentration of hydrogen was lower than in case inert gas was supplied. Hydrogen concentration decreased as the flow rate of air increased at cathode. Increase of temperature, humidity and pressure of anode gas enhanced the hydrogen concentration at cathode. The hydrogen concentration was about 5.0 ppm at current density of 120 mA/cm2 during general PEMFC operation.
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