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메탄올 Crossover 현상이 직접 메탄올 연료전지(DMFC)의 성능에 미치는 영향
Effect of Crossover on the Performance of Direct Methanol Fuel Cell(DMFC)
HWAHAK KONGHAK, February 1999, 37(1), 21-26(6), NONE
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Abstract
메탄올의 crossover현상이 고분자 전해질을 이용한 직접 메탄을 연료전지(DMFC)의 단위전지 성능에 미치는 영향을 실시간 분석하였다. 메탄올의 전기화학적 반응에 의한 crossover주생성물로 메탄올과 메틸포르메이트가 분석되었다. 단위 전지의 운전 온도와 공기극 압력이 증가함에 따라 메탄올의 crossover는 감소되고 DMFC의 단위 전지 성능은 향상되는 현상을 보였다. 메탄올 연료 유속 1.8m1/min와 연료극과 공기극의 차압 2kgf/cm2에서 DMFC의 단위 전지는 0.295V에서 전류밀도 120 mA/cm2로 최대 전지 성능을 나타내었다.
The effects of methanol crossover on the performance of DMFC were analyzed by using real-time analysis. Methanol and methylformate were mainly found as crossover products from the electrochemical conversion of methanol. With the increase of operating temperature and pressure, the crossover rate inversely decreased. As the crossover rate was decreased, the unit cell performance simultaneously increased. Maximum unit-cell current density (120 mA/cm2 at 0.295 V) was obtained at 1.8 ml/min of feed flow rate and 2 kgf/cm2 of pressure difference between cathode and anode.
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References
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Appleby AJ, Foulkes FR, "Fuel Cell Handbook," Van Nostrand Reinhold, N.Y. (1989)
Rauhe BR, Mclarnon FR, Cairns EJ, J. Electrochem. Soc., 142(4), 1073 (1995)
Hampson NA, Williams MJ, J. Power Sources, 4, 191 (1979)
Parsons R, Vandernoot T, J. Electroanal. Chem., 257, 9 (1987)
Hamnett A, Troughton GL, Chem. Ind., 480 (1992)
Kuver A, Vogel I, Vielstich W, J. Power Sources, 52, 77 (1994)
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Verbrugge M, J. Electrochem. Soc., 136, 417 (1989)
Ravikumar MK, Shukla AK, J. Electrochem. Soc., 143(8), 2601 (1996)
Wasmus S, Wang JT, Savinell RF, J. Electrochem. Soc., 142(11), 3825 (1995)
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Surampudi S, Narayanan R, Vamos E, Frank H, Halpert G, J. Power Sources, 47, 383 (1994)
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Nguyen T, Hedstrom JC, Vanderborgh NE, Proc. Electrochem. Soc., 89, 39 (1989)
