| Summary: | 碩士 === 國立中山大學 === 機械與機電工程學系研究所 === 95 === This study discusses the problem of methanol crossover of a direct methanol fuel cell. By increasing the difficulty in the movement of methanol molecules, and blocking the larger holes in the membrane methanol crossover is reduced. The experimental results were further validated through the MEA performance, and its long term stability, and the carbon dioxide reduction in the cathode.
The experimental results show that the most effective way is to soak the membrane in the Nafion solution with ultrasonic vibration applied. Silica, instead of Nafion solution, is able to reduce the methanol crossover the most. However, the MEA thus produced performs poorly because the silica tends to roughen the membrane surface and interfere with the cohesion between the membrane and the electrode.
Further studies are needed on this subject.
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