Abstract: The operation characteristics of proton exchange membrane fuel cells with the channel width of 1mm and 2 mm under a medium-pressure are addressed，and the effect of temperature on the operation characteristic is investigated in detail.The results show that fuel cell with a 2 mm channel width can realize the long time operation in a closed-ended situation.The voltage of the 1mm width cell can drop from 0.7V to 0.5V in 3min，while the 2 mm width cell can last for more than 53min.Moreover，the temperature has a significant effect on the performance，the voltage of the 1mm width cell can drop from 0.69V to 0.5V in less than 1.7min.The resistance of the cell is increasing with the temperature，but the amplitude is smaller in high temperature.

Key words: medium-pressure, hydrogen and oxygen, proton exchange membrane fuel cell

摘要： 通过设计阴极流道宽度为1 mm与2 mm的单电池，研究了不同温度下闭口中压氢-氧质子交换膜燃料电池的运行特性。结果表明：(1)2 mm的电池有较好的闭口稳定运行特性，在800 mA·cm-2下，1 mm的电池闭口运行时，大约经过3 min，电压从0.7 V下降到0.5V，而2 mm的流场结构能实现电池53 min的运行；(2)电池性能随温度的升高而下降，相对于65℃运行，温度为80℃时，1mm的电池闭口运行时，大约经过1.7 min，电压从0.69 V下降到0.5 V，此时为维持电池的高性能运行，氧气侧所需的排放时间越短；(3)电池的内阻随温度的升高而增大，高温时增幅较小。

关键词: 中压, 氢-氧, 质子交换膜燃料电池