The development of a simple and efficient methanol-resistant membrane strategy is of great significance for improvement of the performance of fuel cells, making it an attractive and challenging topic. In this work, sulfonated covalent triazine framework (SCTF) nanosheets are prepared by a micro-interface method and post-sulfonation, which show excellent dispersion in polar solutions, such as water and N, N-Dimethylacetamide (DMAc). Then a series of composite proton exchange membranes (SCTF-x@SPP-co-PAEKs) are prepared by blending these SCTF nanosheets with sulfonated micro-block copolymers (SPP-co-PAEKs) resin. The results show that the appropriate addition of SCTF can significantly improve the proton conductivity (PC), methanol resistance and fuel cell performance of the prepared composite membrane, which can be attributed to the good interfacial compatibility between the SCTF nanosheets and the sulfonated micro-block copolymer matrix. The passive direct methanol fuel cells (DMFCs) with SCTF-x@SPP-3 membrane exhibit power density in the range of 28.0–33.3 mW cm⁻² at 25 °C, which is superior to the related values of the pristine membrane and the commercial Nafion® series membranes.

开发一种简单高效的耐甲醇膜策略对于提高燃料电池的性能具有重要意义，使其成为一个有吸引力且具有挑战性的课题。在这项工作中，磺化共价三嗪骨架（SCTF）纳米片通过微界面法和后磺化制备，在极性溶液中表现出优异的分散性，如水和N，N-二甲基乙酰胺（DMAc）。然后通过将这些 SCTF 纳米片与磺化微嵌段共聚物 (SPP - co - PAEKs) 共混制备一系列复合质子交换膜 (SCTF-x@ SPP- co-PAEKs) 树脂。结果表明，适当添加SCTF可显着提高所制备复合膜的质子电导率(PC)、耐甲醇性和燃料电池性能，这归因于SCTF纳米片与磺化微块之间良好的界面相容性。共聚物基质。具有 SCTF-x@SPP-3 膜的被动直接甲醇燃料电池 (DMFC)在 25°C 下表现出 28.0-33.3 mW cm ^{-2 的}功率密度，优于原始膜的相关值和商用 Nafion® 系列膜。