共聚物
聚砜
高分子化学
膜
材料科学
多金属氧酸盐
聚合物
电导率
化学工程
电解质
化学
物理化学
复合材料
有机化学
电极
催化作用
工程类
生物化学
作者
Yongheng Yin,Hongbo Li,Hong Wu,Wei Wang,Zhongyi Jiang
标识
DOI:10.1016/j.ijhydene.2020.04.039
摘要
Designing polymer chains which contain building blocks with well-defined dimension is an efficient method to induce microphase separation and regulate the ionic channels of polymer electrolyte membranes (PEMs). In this study, a Wells-Dawson-type polyoxometalate (POM) is synthesized and chemically bonded to a norbornene derivative to prepare poly (POM) blocks. Then the block copolymer poly (POM)10-b-poly (COOH)300 is fabricated using poly (POM) and poly (COOH) blocks. Finally, the block copolymer is blended with sulfonated polysulfone (SPS). The electrostatic interactions between the block copolymer and SPS confer the blend membrane with enhanced mechanical and dimensional stabilities. Due to the homogenous distribution of POM clusters and the hydrophilic-hydrophobic interactions between POMs and polymer backbones, the adjacent hydrophilic domains are connected and continuous proton-transfer channels are induced. As a result, the blend membrane displays proton conductivity of 0.053 S cm−1 (25 °C, 100% RH) and 1.5 × 10−2 S cm−1 (80 °C, 40% RH), which are 2.52 and 6.25 times higher than those of the plain SPS membrane. Furthermore, SPS/POM-BC-30 shows a maximum power density of 164.9 mW cm−2, which is 54.7% higher than SPS.
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