被动式直接甲醇燃料电池的性能影响因素研究  

Study on the Influencing Factors Affecting the Performance of Passive Direct Methanol Fuel Cell

作　　者：赖勤志[1] 尹鸽平[1] 王振波[1] 

机构地区：[1]哈尔滨工业大学化工学院,黑龙江哈尔滨150001

出　　处：《高校化学工程学报》2009年第5期756-761,共6页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(20606007;50872027);光宇集团燃料电池项目基金

摘　　要：研究了制约被动式直接甲醇燃料电池(被动式DMFC)性能的因素。通过测定电池的极化曲线、功率密度曲线、长时间放电曲线等手段研究了被动式甲醇燃料电池在不同阴极供料方式、不同阳极供料方式、不同催化剂载量、不同电池温度等条件下的放电特性。测试结果表明:阴极氧气扩散速率较慢是导致被动式电池性能较低的一个主要因素,阴极采用主动进料时电池的性能相比被动式DMFC提高了23.5%,最大功率密度达到8.4mW?cm?2。而且阴极的水淹问题也制约了被动式DMFC的长时间放电性能。提高阴阳极的催化剂载量能显著提高电池的性能,阴阳极催化剂载量为4.0mg?cm?2时,最大功率密度达到11.4mW?cm?2。但是催化剂载量的提高会影响电池的长时间放电性能,特别是,提高阴极催化剂载量能显著提高电池的温度,所以能较大提升电池的性能。The influencing factors affecting the performances of the passive direct methanol fuel cell （DMFC） were studied. The discharge characteristics of the passive DMFC under different operation conditions,such as the feeding ways for the cathode and the anode,amounts of catalyst loading on the cathode and anode and the cell temperature,were investigated by measuring their polarization curves,power density curves and the long-term discharge performance. The results show that the slow oxygen transmission rate on the cathode and the difficulty of removing the water from the cathode are the main factors affecting the performance and the long-term discharge performance of the passive DMFC. The performance of the cell can be increased by 23.5% with active air feeding compared to that of with the passive air feeding,and the peak power density of the cell is 8.4 mW·cm^-2. On the other hand,the performance of the passive DMFC increases with the increase of the catalyst loading on a given electrode. When the catalyst loading on both electrodes are 4.0 mg·cm^-2,the peak power density of the passive DMFC is 11.4 mW·cm^-2 at 30℃. However,the long-term discharge performance of the cell decreases with the increase of the catalyst loading on a given electrode. Especially,the increase of catalyst loading on cathode has an obvious influence on the performance of passive DMFC due to the increase of cell temperature.

关 键 词：直接甲醇燃料电池 被动式 电池温度 传质 

分 类 号：TM911.48[电气工程—电力电子与电力传动]