摘要
采用耐受性曲线、极化曲线及循环伏安等电化学测试手段,分别考察了氢燃料气中含有0.2×10-6、0.4×10-6、0.7×10-6、1.0×10-6、5.0×10-6(体积比)CO或0.2%、3%、10%、20%CO2时,质子交换膜燃料电池(PEMFC)性能的变化情况。研究结果表明,CO的存在会导致电池电压下降,并最终稳定在某值,通过分析电压下降程度与CO浓度的关系,认为使用含CO浓度≤0.4×10-6的氢燃料气运行PEMFC时,电压下降不超过10%,且能保持稳定运行。采用循环伏安法等手段研究了CO2对电池性能的影响机理,认为CO2的存在导致局部H2供应不足,电池出现反极和碳蚀现象,使Pt/C催化剂中C载体含量减少,故在中止通入CO2后电池性能不可恢复至初始水平。
The effect of CO and CO2 in hydrogen on the performance of proton exchange membrane fuel cell （PEMFC） was studied by some tests, such as durability, polarization and cyclic voltammetry with different concentrations of CO, such as 0.2 × 10^-6, 0.4 × 10^-6, 0.7 × 10^-6, 1.0 × 10^-6, 5.0 × 10^-6, and CO2, such as 0.2%, 3%, 10%, 20%, The experimental results show that the cell voltage will drop to a steady state with the presence of CO in H2. A relationship was built between the voltage drop degree and the CO concentration, through which a conclusion could be gotten that when hydrogen contained with less than 0,4 × 10^-6 CO was used as fuel to PEMFC, the cell voltage dropped less than 10% and the cell would perform stably. Methods like CV were used to analyze the mechanism of the effect of CO2. H2 starvation was caused by the existence of CO2, and the phenomena of polarity reversal and carbon corrosion took place, which reduced the amount of carbon in Pt/C. Therefore, the cell performance couldn＇t be recovered after the interruption of the CO2 introduction.
出处
《电源技术》
CAS
CSCD
北大核心
2008年第7期442-445,共4页
Chinese Journal of Power Sources
基金
国家高技术研究发展计划(“863”计划)资助项目(2006AA05Z145)
上海市科学技术委员会科研计划项目(05dz12025)
