质子交换膜燃料电池欧姆阻抗的试验研究

为了解质子交换膜燃料电池(PEMFC)欧姆阻抗的影响因素,用断电法测出了不同工作温度、不同增湿条件、不同进气过量系数、不同工作压力下的欧姆阻抗。试验结果表明,PEMFC欧姆阻抗随工作温度的提高而减小,随进气湿度的增大而减小,受工作压力和进气过量系数的影响较小。欧姆阻抗的明显增大可作为PEMFC质子交换膜变干的判定依据。合理控制工作温度、进气湿度等参数,可以减少欧姆极化损失,提高PEMFC的工作效率。

Experiment on ohmic resistance of proton exchange membrane fuel cell

The factors affecting ohmic losses in proton exchange membrane fuel cells (PEMFC) were investigated using the current interruption method for various operating temperatures, inlet humidity conditions, inlet stoichiometric ratios and operating pressures. The test results indicate that the PEMFC's internal electrical resistance decreases with increases of the operating temperature and the inlet relative humidity, with the cathode stoichiometric ratio and the operating pressures having little influence on the internal resistance. Large increases of internal resistance can indicate the membrane's dryness. Control of the operating temperature and the inlet humidity will reduce ohmic losses in PEMFC and improve the efficiency.