冠醚
膜
离子交换
化学
碱金属
离子电导率
催化作用
电导率
质子交换膜燃料电池
乙醚
超强酸
离子键合
无机化学
碱性燃料电池
化学工程
离子
有机化学
电解质
物理化学
电极
生物化学
工程类
作者
Jia Hui Chen,Yvonne Shuen Lann Choo,Xi Hao Wang,Ying Jie Liu,Xi Bin Yue,Xue Lang Gao,Wei Gao,Qiu Gen Zhang,Ai Mei Zhu,Qing Lin Liu
标识
DOI:10.1016/j.jcis.2023.04.011
摘要
Anion exchange membrane fuel cells (AEMFCs) have emerged as a promising alternative to proton exchange membrane fuel cells (PEMFCs) due to their adaptability to low-cost stack components and non-noble-metals catalysts. However, the poor alkaline resistance and low OH- conductivity of anion exchange membranes (AEMs) have impeded the large-scale implementation of AEMFCs. Herein, the preparation of a new type of AEMs with crown ether macrocycles in their main chains via a one-pot superacid catalyzed reaction was reported. The study aimed to examine the influence of crown ether cavity size on the phase separation structure, ionic conductivity and alkali resistance of anion exchange membranes. Attributed to the self-assembly of crown ethers, the poly (crown ether) (PCE) AEMs with dibenzo-18-crown-6-ether (QAPCE-18-6) exhibit an obvious phase separated structure and a maximum OH- conductivity of 122.5 mS cm-1 at 80 °C (ionic exchange capacity is 1.51 meq g-1). QAPCE-18-6 shows a good alkali resistance with the OH- conductivity retention of 94.5% albeit being treated in a harsh alkali condition. Moreover, the hydrogen/oxygen single cell equipped with QAPCE-18-6 can achieve a peak power density (PPD) of 574 mW cm-2 at a current density of 1.39 A cm-2.
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