基于高氢气利用率的质子交换膜燃料电池运行特性研究

Study on Operating Characteristics of PEM Fuel Cell Based on High Hydrogen Utilization

为了提高氢气利用率本文对氢氧燃料电池在不同的阳极进口压力、阴极过量系数以及工作温度下进行阳极长时间闭口运行,考察阳极闭口对电池性能的影响。在每个操作条件运行期间阳极电池阀均未中途打开(单个操作条件最长运行时间26 h),氢气利用率达100%。结果表明:氢氧燃料电池除了在低阴极过量系数且高电流密度之外在其它各工况下阳极闭口能长时间稳定运行。膜电极分区域断面SEM测试表明出口处附近区域阳极和阴极催化层均有所减薄而其它区域膜电极催化层均没有受到影响。这表明电池出口附近碳腐蚀造成的催化层减薄与电池出口附近处水淹是有必然联系的。

To improve hydrogen utilization,the dead-end anode operation of a hydrogen-oxygen fuel cell with different anode inlet pressure,cathode stoichiometric ratio and cell temperature was achieved in this paper.The anode outlet solenoid valve was normally closed during each operating conditions（The longest running time of a single operation condition was 26 h）,and so the hydrogen utilization reach 100%.The results show that the fuel cell running steadily during its long time dead-end anode operation under different operating mode but with the exception of smaller cathode stoichiometric ratio,the multiple locations cross-sectional SEM show that the thickness of both anode and cathode catalyst layer near the outlet was reduced while other location was not affected.These observations confirm a strong correlation between the carbon corrosion and water flooding occurring near the cell outlet.