Long-term performance of polyetheretherketone-based polymer electrolyte membrane in fuel cells at 95 °C
Long-term performance of polyetheretherketone-based polymer electrolyte membrane in fuel cells at 95 °C
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DOI：
10.1007/s10853-009-3490-z
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发表时间：
2009-04
影响因子：
4.5
通讯作者：
Jinhua Chen;Maolin Zhai;M. Asano;Ling Huang;Y. Maekawa
中科院分区：
文献类型：
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作者：
Jinhua Chen;Maolin Zhai;M. Asano;Ling Huang;Y. Maekawa
通过辐射接枝聚乙基苯磺酸乙酯(ETS)制备了聚苯乙烯磺酸接枝聚醚醚酮(SSPEEK)聚合物电解质膜。在95℃的燃料电池中测试了sPEEK电解质膜的长期寿命，在此期间，在0.3A/cmμ−2的电流密度下，聚合物电解质膜的寿命超过1000h，电压衰减速率为18T−V/h−2。耐久性测试后，用X射线衍射仪和透射电子显微镜对催化层进行了分析；通过测定膜的厚度、质子电导率和磺酸基团的数量的变化来表征聚合物电解质膜的性能。结果表明，燃料电池的性能劣化是由于碳氢化合物聚合物电解质膜暴露在以纯氧为氧化剂的电化学环境中的热老化，以及Nafion基催化层长期处于高温状态下铂催化剂的聚集和烧结所致。
A poly(styrenesulfonic acid)-grafted polyetheretherketone (ssPEEK) polymer electrolyte membrane was developed by radiation grafting of ethyl styrenesulfonate (ETSS) onto PEEK film and subsequent hydrolysis. The long-term durability of the ssPEEK electrolyte membrane was tested in a fuel cell at 95 °C, during which it exhibited a lifetime of more than 1000 h and a slow voltage degradation of 18 μV h−1at a current density of 0.3 A cm−2. After durability test, the catalyst layers were analyzed by X-ray diffraction (XRD) and transmission electron microscopy (TEM); the polymer electrolyte membrane was investigated by determining the change in thickness, proton conductivity, and amounts of sulfonic acid groups. It was concluded that the degradation of performance in fuel cell was due to the thermal aging of the hydrocarbon polymer electrolyte membrane being exposed to the electrochemical environment with the pure oxygen acting as the oxidant gas, as well as the Nafion-based catalyst layer being subjected to high temperature for a long time, where the Pt catalyst was aggregated and sintered.