现场测量PEMFC膜电极参数的方法  

An in site method to test membrane electrode parameters of PEMFC

作　　者：曾夏[1] 裴普成[1] 徐华池[1] 杨腾飞[1] 

机构地区：[1]清华大学汽车安全与节能重点实验室,北京100084

出　　处：《电源技术》2013年第11期1993-1996,共4页Chinese Journal of Power Sources

基　　金：国家自然科学基金(20976095)

摘　　要：为了实现现场测试大面积质子交换膜燃料电池单体及堆中膜电极的催化剂有效活性面积、氢气渗透电流和双电层电容等参数,介绍了一种恒定电流测量法。用一个恒流电源施加于燃料电池,燃料电池膜电极两侧分别通上氢气和氮气,通过一个数据采集器,记录燃料电池两电极间的电压,当电压逐渐升到0.8 V以上时关断电源。对一个由两片燃料电池组成的电池堆测试,研究了燃料电池堆温度及气体相对湿度对膜电极参数的影响,结果表明:气体相对湿度增大时,催化剂活性面积增大,双电层电容增大,氢渗透电流减小;而温度上升时,双电层电容增大,且当气体相对湿度超过90%时才呈现氢渗透电流轻微增大、催化剂活性面积减小的规律。此方法可作为评价燃料电池膜电极优劣的通用技术,为促进该方法的应用,设计了燃料电池膜电极测量仪,实验证明其方便可靠。To test electrochemical active surface, crossover current and double layer capacitance of fuel cells or stacks in site with large area of proton exchange membrane, a galvanostatic measurement method was introduced. The fuel cell was operated with a constant current, supplied with hydrogen and nitrogen in the anode and cathode sides, and the power was shut off when the voltage was up to 0.8 V. Tests on a two-cell stack were carried out, and the influences of temperature and the relative humidity on the parameter were researched. Results show that with the increase of gas relative humidity, the electric double layer capacitance and the electrochemical active surface increases, while the hydrogen crossover current decreases; and with the increase of temperature, the hydrogen crossover current increases, electric double layer capacitance increases and the electrochemical active surface decreases when gas relative humidity is more than 90%. This method can be used as a general technology to evaluate fuel cells.

关 键 词：燃料电池 恒流法 催化剂有效面积 双电层电容 渗透电流 

分 类 号：TM911.4[电气工程—电力电子与电力传动]