商业尺寸质子交换膜燃料电池性能实验研究

林林, 吴睿, 张欣欣

北京科技大学机械工程学院热能工程系



摘要:

实验测试了不同电池操作温度和反应气加湿温度下,反应面积为256 cm2商用质子交换膜燃料电池的性能,通过对极化曲线的测量,重点分析了操作温度与加湿温度对不同厚度质子膜含水量及电池阴极水泛滥的影响.结果表明,质子膜含水量及阴极液态水移除主要取决于加湿温度和操作温度的最佳匹配.当操作温度低于加湿温度时,电池性能随操作温度升高而提高;反之,电池性能随操作温度升高而下降.在相同电池温度和加湿温度下,Core 57电池性能优于Core 5621,因为较薄的Core 57更容易保持膜的含水量.低操作温度下,较薄的Core 57电池阳极或阴极仅需一侧加湿即可维持膜的含水量,因此一侧加湿时的电池性能优于两侧加湿时的.而对于较厚的Core 5621,无论操作温度高低,阴阳极两侧需同时加湿才能保证膜的含水量;因此,对于采用较厚质子膜的商用燃料电池,操作时必须保证阴阳极同时加湿.

关键词:  电池性能  质子交换膜燃料电池  极化曲线  水的传递

DOI：10.11918/j.issn.0367-6234.2011.03.024

分类号:TM911.4

基金项目:国家自然科学基金资助项目(50836001)



Experimental investigation of membrane thickness and operating conditions on PEM fuel cell performance

LIN Lin, WU Rui, ZHANG Xin-xin

Department of Thermal Engineering,School of Mechanical Engineering,University of Science and Technology Beijing, 100083 Beijing,China

Abstract:

This study used two kinds of proton exchange membranes Gore 5621 and Gore 57 to fabricate 16 cm×16 cm proton exchange membrane fuel cell with serpentine flow field.The performances of both cells were tested experimentally at various operating conditions.The cell performance was found to be closely relative to the membrane hydration,cathode flooding and a proper combination of cell temperature and humidification temperature.At a specified cell temperature and humidification temperature,Gore 57 had better performance than Gore 5621,since thinner membrane Gore 57 can maintain very good hydration with a small amount of water,which made the cell operate at a higher cell temperature and lower humidification temperature.At the lower cell temperature the performance of Gore 57 cell was better with dry air or dry hydrogen than humidified air or humidified hydrogen,while at the higher cell temperature the cell performance was worse with dry air or dry hydrogen.The performance of Gore 5621 cell was worse with dry air or dry hydrogen than humidified air or humidified hydrogen for all cell temperatures,which indicates that for thicker membrane Gore 5621,cathode humidification and anode humidification are all important to improve cell performance.

Key words:  cell performance  proton exchange membrane fuel cell  polarization curves  liquid water transport