聚偏氟乙烯
材料科学
膜
化学工程
氢氧化物
离子电导率
直接甲醇燃料电池
高分子化学
氟化物
甲醇燃料
肿胀 的
纳米纤维
离子交换
复合材料
化学
无机化学
聚合物
电解质
有机化学
离子
电极
生物化学
物理化学
阳极
工程类
作者
Ying Ou,Ting Qu,Fan Cheng,Haiyang Yang,Fuqiang Hu,Jie Wang,Hai Li,Guoliang Liu,Sheng Wen,Chunli Gong
标识
DOI:10.1016/j.carbpol.2023.121363
摘要
The main obstacle of high-performance cationic functionalization chitosan (CS) as anion exchange membranes (AEMs) is the trade-off between mechanical stability and ionic conductivity. Here, in-situ ionic crosslinking between the deprotonated hydroxyl group and quaternary ammonium group under alkaline conditions was ingeniously applied to improve the mechanical stability of highly quaternized CS (HQCS) with high IEC (>2 mmol g-1). Meanwhile, to further reduce the swelling and enhance the hydroxide conductivity, a mechanically robust hydroxide ion conduction network, quaternized electrospun poly(vinylidene fluoride) (QPVDF) nanofiber, was subsequently used as the filling substrate of in-situ crosslinked HQCS to prepare dual reinforced thin AEMs. The introduction of a robust QPVDF nanofiber mat can not only greatly improve the mechanical properties and limit swelling, but also create facile ion transport channels. Notably, the HQCS/QPVDF-74.0 composite membrane demonstrates perfect dimensional stability, high mechanical performance and excellent alkaline stability, as well as superior ionic conductivity of 66.2 mS cm-1 at 80 °C. The thus assembled alkaline direct methanol fuel cell displays a maximum power density of 132.30 mW cm-2 using 5 M KOH and 3 M methanol as fuels at 80 °C with satisfactory durability.
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