Nemeth Tamas, Han Zongyi, Gubler Lorenz
PSI Center for Energy and Environmental Sciences, 5232 Villigen PSI, Switzerland.
Sustainable Energy Technologies, SINTEF Industry, 7034 Trondheim, Norway.
Membranes (Basel). 2024 Dec 7;14(12):263. doi: 10.3390/membranes14120263.
The impeding ban on per- and polyfluoroalkyl substances (PFAS) prompted researchers to focus on hydrocarbon-based materials as constituents of next-generation proton exchange membranes (PEMs) for polymer electrolyte fuel cells (PEFCs). Here, we report on the fuel cell performance and durability of fluorine-lean PEMs prepared by the post-sulfonation of co-grafted α-methylstyrene (AMS) and 2-methylene glutaronitrile (MGN) monomers into preirradiated 12 µm polyvinylidene fluoride (PVDF) base film. The membranes were subjected to two distinctly different accelerated stress test (AST) protocols performed at open-circuit voltage (OCV): the US Department of Energy-similar chemical AST (90 °C, 30% relative humidity (RH), H/air, 1 bar), developed originally for perfluoroalkylsulfonic acid (PFSA) membranes, and the high relative humidity AST (80 °C, 100% RH, H/O, 2.5 bar), designed for aromatic hydrocarbon membranes. We found that doping the grafted membranes with a metalated porphyrin antioxidant can simultaneously reduce membrane aging and improve fuel cell performance.
即将实施的全氟和多氟烷基物质（PFAS）禁令促使研究人员将注意力集中在基于碳氢化合物的材料上，这些材料可作为聚合物电解质燃料电池（PEFC）下一代质子交换膜（PEM）的组成部分。在此，我们报告了通过将共聚接枝的α-甲基苯乙烯（AMS）和2-亚甲基戊二腈（MGN）单体后磺化到预辐照的12 µm聚偏二氟乙烯（PVDF）基膜中制备的低氟PEM的燃料电池性能和耐久性。这些膜在开路电压（OCV）下进行了两种截然不同的加速应力测试（AST）方案：美国能源部类似的化学AST（90°C，30%相对湿度（RH），H/空气，1 bar），最初是为全氟烷基磺酸（PFSA）膜开发的；以及高相对湿度AST（80°C，100%RH，H/O，2.5 bar），是为芳烃膜设计的。我们发现，用金属化卟啉抗氧化剂掺杂接枝膜可以同时减少膜老化并提高燃料电池性能。
