Development of a 150-watt direct methanol fuel cell system

T. Valdez, S. Narayanan, N. Rohatgi
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引用次数: 3

Abstract

Stack development for a Nafion(R) based 150-watt direct methanol fuel cell (DMFC) system is discussed in this paper. Single cell data for a membrane electrode assembly (MEA) that can operate at low air stoichiometry is presented. The stack operating conditions for achieving a water balance have been determined to be 55/spl deg/C 0.5 M MeOH at a maximum of 1.75 times air stoichiometry at 100 mA/cm/sup 2/. Single cells with a 25-cm/sup 2/ active area have been operated in this regime and can maintain an average cell voltage of 0.43 V at 100 mA/cm/sup 2/ for 120 minutes with a cell voltage decay of 0.2 mV/min. A five-cell stack with a 80-cm/sup 2/ active area, scaled up from the single cell, was capable of sustaining 100-mA/cm/sup 2/ load at a 1.75 air stoichiometry for over 70 hours, with a voltage decay of the order of 2 mV/hr. Voltage decay is reversible by purging excess water in the cathode.
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150瓦直接甲醇燃料电池系统的研制
本文讨论了一种基于Nafion(R)的150瓦直接甲醇燃料电池(DMFC)系统的电池组开发。介绍了一种能在低空气化学计量下工作的膜电极组件(MEA)的单细胞数据。达到水平衡的堆操作条件已确定为55/spl度/C, 0.5 M MeOH,最大1.75倍空气化学计量,100 mA/cm/sup / 2/。具有25 cm/sup 2/活性面积的单个电池在该状态下运行,可以在100 mA/cm/sup 2/下保持平均电池电压0.43 V 120分钟,电池电压衰减为0.2 mV/min。一个具有80 cm/sup 2/有效面积的五电池堆叠,在1.75空气化学计量下能够维持100 ma /cm/sup 2/负载超过70小时,电压衰减为2 mV/hr。通过清除阴极中多余的水,电压衰减是可逆的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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