图案化膜对PEMFC阴极质量传递的影响研究

Effect of patterned membrane on cathode mass transfer of PEMFC

为了探究图案化膜通过影响单电池内部水气输运机制进而影响电池性能这一中间机理过程,建立了质子交换膜燃料电池的单电池模型,并进行了数值仿真计算,对比了微孔图案膜和凸起图案膜的性能,发现微孔膜的效果更佳。探究了质子交换膜阴极表面微孔的半径和数量对燃料电池性能和阴极质量传递的影响。结果表明,微孔的存在可以起到一定的微储水作用,使膜的湿润性增加,进而利于质子传导,这也是相较于凸起膜,微孔膜性能更好的主要原因。随着微孔半径的增加,膜的储水能力增大,产生的电流密度逐渐变大。随着微孔数量的增多,膜表面水含量和电流密度也有一定的升高趋势,但趋势均不太明显。

In order to explore the intermediate mechanism that patterned membrane affects the performance of fuel cell by affecting the water and gas transport mechanism inside the cell,a single cell model of proton exchange membrane fuel cell was established and numerical simulation was carried out.The performance of microporous membrane was compared with that of convex membrane,and the effect of microporous membrane was better.Then the influence of the radius and number of micropores on the performance of the fuel cell and the mass transfer of the cathode was investigated.The result shows that the micropores in the membrane can play a role in micro-water storage pond,which increases the wettability of membrane so that facilitating proton conduction,which is also the main reason for the better performance of the microporous membrane compared with the convex membrane.With the increase of the micropore radius,the water storage capacity of the membrane and the current density gradually increases.With the increase of the number of micropores,the water content and current density of the membrane surface also have a certain increasing trend,but the trend is not obvious.