聚乙烯醇
化学工程
材料科学
乙二醇
离子电导率
膜
电导率
复合数
壳聚糖
氢氧化物
层状双氢氧化物
电解质
化学
离子交换
高分子化学
复合材料
离子
有机化学
生物化学
工程类
电极
物理化学
作者
Shujun Zhao,Wen‐Chin Tsen,Chunli Gong
标识
DOI:10.1016/j.carbpol.2020.117439
摘要
To solve the trade-off problem among ionic conductivity, mechanical and chemical stability of anion exchange membranes (AEMs), quaternized chitosan (QCS) was first prepared and then was blended with polyvinyl alcohol (PVA) to improve mechanical strength of QCS. Afterwards, three-dimensional (3D) hierarchical flower-like layered double hydroxides (LDHs) were prepared via one-pot ethylene glycol-assisted solvothermal method, and then were incorporated into QCS/PVA blend matrix to fabricate composite AEMs. By constructing 3D hierarchical structure, the active sites of LDH nanosheets are fully exposed, thus impressive ion conductivity, alkali and fuel resistant ability of LDH nanosheets can be rationally utilized. The composite membrane displayed the maximum OH− conductivity of 25.7 mS cm-1, which was 48.6 % higher than that of the pristine membrane. Alkaline stability measurement proved that the composite membranes kept residual ionic conductivity of as high as 92 % after immersion in a 2 M KOH for 100 h. Due to the decreased methanol permeability and increased conductivity, the composite membrane with 6% LDHs content exhibited a peak power density of 73 mW cm-2 at 60 °C, whereas the pristine membrane demonstrated only 40 mW cm-2.
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