氢气杂质CO对质子交换膜燃料电池性能影响建模

Modeling for effect of CO in hydrogen on performance of PEMFC

从CO对燃料电池性能影响的机理出发,分别对电池的电化学活化极化段、欧姆极化段、浓差极化段中CO的影响进行了探讨,并建立了CO对PEMFC的性能影响模型。提出电池在中等电流密度段电压迅速下降的原因是由于CO吸附在催化剂表面,影响了氢气氧化反应的速率,从而降低了电极的极限电流密度造成的。通过50cm2单电池的1×10-6CO影响结果对模型的输出结果进行验证,两者比较符合。

CO poisoning mechanism has been investigated. The influences for CO on the activation loss, ohmic loss, and concentration loss were discussed separately, and then the model for the effect of CO on the performance of PEMFC was obtained. The cell voltage dropped severely in the presence of CO at moderate current density. That is due to that the decrease of limit current density caused by CO coverage. This model is validated by a test on a 50 cm^2 single cell in the presence of 1 ×10^-6 CO in hydrogen,and the output of the model shows a good agreement with experiment results.