自呼吸式DMFC膜电极组件的新结构  

A novel structure of MEA for air-breathing DMFC

作　　者：张健[1] 尹鸽平[1] 王家钧[1] 赖勤志[1] 

机构地区：[1]哈尔滨工业大学应用化学系,黑龙江哈尔滨150001

出　　处：《电池》2008年第5期267-269,共3页Battery Bimonthly

基　　金：国家自然科学基金(20606007);光宇集团燃料电池项目基金

摘　　要：提出一种新型的自呼吸式膜电极组件(MEA)结构,将用作阴极集流体的薄金属拉伸网直接嵌入阴极催化层中。电化学阻抗分析表明,新型MEA比传统MEA的欧姆电阻和扩散阻抗更小。新型MEA的最大功率密度可达9.6 mW/cm2(电池温度为25℃),比传统MEA提高了10.3%。长时间40 mA/cm2恒流测试表明,新型MEA有增强的氧传输速率和较好的水管理能力,因此电压衰减速率较小。A novel air-breathing membrane electrode assembly （MEA） ,in which a thin expanded metal mesh used as the cathode current conector was directly embedded in the cathode catalyst layer was proposed. The electrochemical impedance analysis showed that the ohmic resistance and mass transfer resistance of novel MEA was lower than that of the conventional one. The highest power density of novel M EA was 9.6 mW/cm^2 （cell temperature was 25℃ ）, increased by 10.3 % compared with conventional one. The long-term 40 mA/cm^2 galvanostatic test showed that the voltage decaying rate of novel MEA was lower than that of conventional one since the novel MEA had enhanced oxygen transport rate and better water management ability.

关 键 词：直接甲醇燃料电池(DMFC) 膜电极组件(MEA) 自呼吸式 集流体 

分 类 号：TM911.47[电气工程—电力电子与电力传动]