流动电池
钒
Nafion公司
氧化还原
磺酸
膜
肿胀 的
离聚物
质子交换膜燃料电池
材料科学
化学
侧链
化学工程
高分子化学
无机化学
电极
电化学
复合材料
聚合物
共聚物
工程类
物理化学
电解质
生物化学
作者
Xiaoming Yan,Ziwei Dong,Mengting Di,Lei Hu,Caimian Zhang,Yu Pan,Ning Zhang,Xiaobin Jiang,Xuemei Wu,Jinyan Wang,Gaohong He
标识
DOI:10.1016/j.memsci.2019.117616
摘要
A long-side-chain sulfonated polybenzimidazole (PBI-PS) membrane was successfully prepared by the reaction of PBI with 1, 3-propanesultone for improving the efficiencies of vanadium redox flow battery. The interaction between sulfonic acid and imidazole groups provides the PBI-PS membrane with excellent swelling resistance, leading to a swelling ratio of only 13% for the membrane with IEC of as high as 3.18 mmol g−1. This results in an ultra-low vanadium permeability (6.5 × 10−9 cm2 s−1). The introduction of sulfonic acid-terminated flexible side chain in the membrane also constructs good microphase separation structure, leading to a low area resistance of 0.51 Ω cm2, which is close to Nafion 212 (0.41 Ω cm2). This membrane exhibits excellent cell performance. The voltage and energy efficiencies are up to 90.73% and 89.13% at 80 mA cm−2, respectively. Furthermore, the efficiencies remain constant values for 200 cycles, and no changes in chemical structure and cell efficiencies are observed after 720 h immersion in electrolyte solution.
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