Improvement in DMFC performance by changing fuel feed method

摘要：

DMFCs (Direct Methanol Fuel Cells) are the promising energy sources for future mobile device. But they have a disadvantage of low power density. We are concerned with major causes of the low power density, CO2 bubbles generated in an anode side and methanol crossover. We measure the I-V characteristic of a DMFC for positive pressure (a fuel pump at the front of a DMFC) and for negative pressure (a fuel pump behind a DMFC). To check the methanol crossover, a CO2 concentration in a cathode side is measured by using a CO2 concentration sensor. The experimental results show that for the negative pressure the CO2 concentration in a cathode side (indicator of methanol crossover) decreases comparing with that of the fuel feed in the positive pressure and the cell performance is improved. But it is found that for negative pressure under some low fuel flow rate the output becomes zero though for positive pressure not zero.

关键词： DMFC CO2 bubbles positive pressure negative pressure methanol crossover

作者: Tetsuya Hara Noboru Katayama Yusuke Kudo Sumio Kogoshi

作者单位: Faculty of Science and Technology, Tokyo University of Science, Chiba 278-8510, Japan

会议类型: 国际会议

会议名称: The International Conference on Electrical Engineering 2009(2009 电机工程国际会议)

会议地点: 沈阳

会议语种:英文

页码: 1-5

在线出版日期: 2009-07-05（万方平台首次上网日期，不代表论文的发表时间）