직접메탄올연료전지에서 메탄올 크로스오버에 미치는 인자 연구
Investigation of Factors Influencing Methanol Crossover in Direct Methanol Fuel Cell
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초록
직접메탄올연료전지의 운전 변수에 따른 메탄올 크로스오버를 메탄올 농도센서를 이용하여 정량적으로 측정하였으며 실제 셀 운전 시 메탄올크로스오버 저감의 측면에서 유리한 운전조건을 분석하였다. 메탄올 농도, 전극 양단의 압력차, 전류의 크기, 온도, stoichiometry 등을 변화시켜 diffusion, convection, electro-osmosis의 메커니즘별 기여도와 실제 전지 운전 조건의 영향을 함께 분석하였다. 이상의 세 가지 메커니즘 중에서 농도 차이에 의한 diffusion이 가장 큰 영향을 미쳤으며 electro-osmosis에 의한 영향은 고농도에서만 관찰할 수 있었다.
Abstract
The amount of methanol crossover was measured with changing the operating condition by using a liquidmethanol concentration sensor. Appropriate operating condition was discussed in terms of methanol crossover. Mech-anism of methanol crossover was clasified into three items which are diffusion, convection and electro-osmosis. Con-tribution of each mechanism to methanol crossover and the effect of operating condition were analyzed with varyingmethanol concentration, pressure difference between anode and cathode, current, temperature, and stoichiometry ofanode fuel. Among the thre mechanisms diffusion affected mostly and electro-osmosis effect was observed onlyunder high methanol concentration.
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