重力对PEMFC性能影响的实验

Experimental Study of the Gravity Effect on PEMFC Performance

目的改变PEMFC（质子交换膜燃料电池）阴极和阳极的上下位置，测试重力对PEM-FC水管理的影响，优化燃料电池阴阳极的摆放方式.方法对应着阴阳极上下位置的不同，在阴极气体加湿（阳极不加湿）和阳极气体加湿（阴极不加湿）两种运行条件下，通过改变电子负载测定输出电压和电流.结果温度在40-70℃变化时，对阳极在上，阳极气体加湿或不加湿；阴极在上，阴极气体加湿或不加湿4种情况，测得的电压/电流密度数据，绘出了4幅极化曲线图.结论重力对PEMFC内液态水的排出有很大的影响，阴极在上时，如果液态水过剩，过剩液态水不容易排出电池阴极；而当阳极在上时，阴极过剩液态水相对容易从电池阴极排出.阳极在上的PEMFC电流密度性能要比阴极在上的要好.

The purpose was to test the gravity effect on the PEMFC （Proton Exchange Membrane Fuel Cell） water management by changing the PEMFC＇ s anode-upward and cathode-upward, in order to optimize the setting position of PEMFC＇ s anode and cathode. When the condition was cathode gas humidified （anode gas is dry） or anode gas humidified （cathode gas is dry）, it would get the voltage/current data by changing the electronic loads under the different position of anode and cathode. The result was four polarization performance curves got by changing temperature from 40℃--70℃. It draws the conclusion that gravity has an influence on liquid water discharged in the PEMFC. On cathode-upward, it＇ s not easy to discharge the liquid water. On anode-upward, it＇s easy to discharge the liquid water from cathode. Anode-upward performance of PEMFC is better than cathode-upward one.