The degradation of perfluorinated sulfonic acid ionomer (PFSA) binder in catalyst layer of Proton Exchange Membrane Fuel Cell (PEMFC) was investigated on Membrane-Electrode-Assemblies (MEA) operated up to 10400 h in base load conditions for telecom relay. Soxhlet extractions in water media were performed on the catalyst layer deposited on the Gas Diffusion Layer (GDL). The Soxhlet solutions for anode and cathode sides were analyzed by ¹⁹F NMR spectroscopy showing degradation products originating from the ionomer in the catalyst layer. At the cathode side, 1,2,2-tetrafluoro-2-(1,2,2,2-tetrafluoroethoxy)ethanesulfonic acid were clearly identified. This suggests that PFSA binder degradation originated from an H• and/or •OH radical attack of the side chain. The NMR quantification of the degradation products allows a fruitful comparison with the literature. The degradation mechanism of the PFSA binder is different from that of the membrane.

研究了质子交换膜燃料电池（PEMFC）催化剂层中全氟磺酸离聚物（PFSA）粘合剂的降解情况，该膜-电极-组件（MEA）在基本负荷条件下运行时间长达10400小时，用于电信中继。在水介质中的索氏提取法是对沉积在气体扩散层（GDL）上的催化剂层进行的。阳极和阴极侧的索氏溶液通过¹⁹分析F NMR光谱显示降解产物源自催化剂层中的离聚物。在阴极侧，清楚地识别出1,2,2-四氟-2-（1,2,2,2-四氟乙氧基）乙烷磺酸。这表明PFSA粘合剂的降解源自侧链的H•和/或•OH自由基攻击。降解产物的NMR定量可以与文献进行比较。PFSA粘合剂的降解机理与膜的降解机理不同。