Ke Xi, Zhang Yufei, Gohs Uwe, Drache Marco, Beuermann Sabine
Institute of Technical Chemistry, Clausthal University of Technology, Arnold-Sommerfeld-Strasse 4, 38678 Clausthal-Zellerfeld, Germany.
Institut fur Leichtbau und Kunststofftechnik, Technische Universitat Dresden, Hohlbeinstrabe 3, 01307 Dresden, Germany.
Polymers (Basel). 2019 Jul 11;11(7):1175. doi: 10.3390/polym11071175.
Polymer electrolyte membranes (PEM) for potential applications in fuel cells or vanadium redox flow batteries were synthesized and characterized. ETFE (poly (ethylene-alt-tetrafluoroethylene)) and PVDF (poly (vinylidene fluoride)) serving as base materials were activated by electron beam treatment with doses ranging from 50 to 200 kGy and subsequently grafted via radical copolymerization with the functional monomers 2-acrylamido-2-methylpropane sulfonic acid and acrylic acid in aqueous phase. Since protogenic groups are already contained in the monomers, a subsequent sulfonation step is omitted. The mechanical properties were studied via tensile strength measurements. The electrochemical performance of the PEMs was evaluated by electrochemical impedance spectroscopy and fuel cell tests. The proton conductivities and ion exchange capacities are competitive with Nafion 117, the standard material used today.
合成并表征了可用于燃料电池或钒氧化还原液流电池的聚合物电解质膜（PEM）。作为基础材料的乙烯-四氟乙烯共聚物（ETFE）和聚偏氟乙烯（PVDF）通过剂量范围为50至200 kGy的电子束处理进行活化，随后在水相中通过与功能单体2-丙烯酰胺-2-甲基丙烷磺酸和丙烯酸的自由基共聚进行接枝。由于单体中已含有质子生成基团，因此省略了后续的磺化步骤。通过拉伸强度测量研究了机械性能。通过电化学阻抗谱和燃料电池测试评估了PEM的电化学性能。质子电导率和离子交换容量与当今使用的标准材料Nafion 117具有竞争力。
