Kawai Yoshiki, Lu Yirui, Zhang Shaoling, Masuda Gen, Matsumoto Hidetoshi
Department of Materials Science and Engineering, School of Materials and Chemical Technology, Institute of Science Tokyo, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan.
School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
Membranes (Basel). 2025 Aug 27;15(9):254. doi: 10.3390/membranes15090254.
Poly(ionic liquids) (PILs) show great promise as a new class of solid electrolytes for energy applications, including high-temperature polymer electrolyte fuel cells, owing to their combination of the unique electrochemical properties of ionic liquids and macromolecular architecture. In this study, we prepared and characterized PIL-based composite polymer electrolyte membranes containing silica nanofibers (SiONFs). The SiONFs were prepared via electrospinning, followed by calcination, and were used as a thermally and mechanically stable, porous substrate. The crosslinked protic PIL was synthesized via in situ radical polymerization of imidazolium hydrogensulfate-based reagents (one monomer and one crosslinker). It was then used as the membrane matrix. The prepared freestanding PIL membranes remained thermally stable at temperatures of up to 180 °C. Furthermore, the PIL/SiONF composite electrolyte membranes demonstrated improved mechanical properties due to reinforcement by the NF framework. These composite membranes also exhibited relatively high proton conductivity (approximately 0.1 to 1 mS/cm) in the 100-150 °C temperature range.
聚离子液体（PILs）作为一类新型的固体电解质，在能源应用领域，包括高温聚合物电解质燃料电池，展现出了巨大的潜力，这得益于其将离子液体独特的电化学性质与高分子结构相结合。在本研究中，我们制备并表征了含有二氧化硅纳米纤维（SiONFs）的基于PIL的复合聚合物电解质膜。SiONFs通过静电纺丝制备，随后进行煅烧，并用作热稳定和机械稳定的多孔基质。交联质子PIL通过基于硫酸氢咪唑鎓的试剂（一种单体和一种交联剂）的原位自由基聚合合成。然后将其用作膜基质。制备的独立PIL膜在高达180°C的温度下仍保持热稳定性。此外，由于NF框架的增强作用，PIL/SiONF复合电解质膜表现出改善的机械性能。这些复合膜在100 - 150°C温度范围内也表现出相对较高的质子电导率（约0.1至1 mS/cm）。
