Design of a MEA with multi-layer electrodes for high concentration methanol DMFCs |
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Authors: | Young-Chul Park Dong-Hwi Kim Seongyop Lim Sang-Kyung Kim Dong-Hyun Peck Doo-Hwan Jung |
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Affiliation: | 1. Korea Institute of Energy Research (KIER), 71-2 Jangdong, Yuseong, 305-343 Daejeon, Republic of Korea;2. Advanced Energy Technology, University of Science & Technology (UST), Daejeon, Republic of Korea |
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Abstract: | According to the conventional MEA test, methanol and water crossover are the main factors to determine performance of a passive DMFC. Thus, to ensure the high cell performance of a passive DMFC using high concentration methanol of 50–95 vol%, the MEA in this study introduces the barrier layer to limit the crossover of high concentration methanol, a hydrophobic layer to reduce water crossover, and a hydrophilic layer to enhance the water recovery from the cathode to the anode. The functional layers of the MEA have the effect of improving the performance of the passive DMFC by decreasing the methanol and water crossover. In spite of the operation with 95 vol% methanol, the MEA with multi-layer electrodes for high concentration methanol DMFCs shows a maximum power density of 35.1 mW cm−2 and maintains a high power density of 30 mW cm−2 (0.405 V) under constant current operation. |
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Keywords: | Passive direct methanol fuel cell High concentration methanol operation Methanol crossover Water crossover Cell performance |
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