杂多酸对燃料电池质子交换膜稳定性的影响

Effects of heteropoly acid on stability of proton exchange membrane used in fuel cell

采用硅烷偶联剂、磷钼酸及硅钨酸对全氟磺酸离子膜进行了表面改性,制备了燃料电池质子交换复合膜。测定了升温速率为5、10、20和30℃/min时的热重曲线及不同温度时膜的质子电导率。实验结果表明,复合膜的热分解过程经历三个阶段,热降解峰温向低温区偏移,并计算了第一和第二阶段的表观活化能。当温度高于363.3℃时,复合膜的热稳定性优于原膜;在-30~0℃和20~90℃区间,原膜与复合膜的质子电导率均随温度的升高而增大,复合膜的质子电导率明显优于原膜。

Using silane coupling agent and phosphomolybdic acid and silicon tungsten acid to modify the surface of perfluorinated sulfonic acid ion-exchange membrane, the composite membrane used in fuel cells was prepared.When the heating rate respectively was 5, 10, 20 and 30 ℃/min, TGA curves and proton conductivity at different temperatures were determined. Experimental results show that the thermal decomposition process of composite membranes are through three stages. The peak temperature of thermal degradation was moved toward the low temperature zone offset, the apparent activation energy of the first and second stages were calculated. When the temperature was higher than 363.3 ℃, thermal stability of the composite film was better than the original membrane.At-30 ℃ to 0 ℃ and 20 ℃ to 90 ℃ range, proton conductivity of original membrane and composite membrane were gradually increased with the increase of the temperature, proton conductivity of the composite film was better than the original film.