Department of Chemical & Biochemical Engineering, Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, PR China.
School of Energy and Chemical Engineering, Xiamen University Malaysia, Sepang 43900, Selangor Darul Ehsan, Malaysia.
J Colloid Interface Sci. 2023 Aug;643:62-72. doi: 10.1016/j.jcis.2023.04.011. Epub 2023 Apr 6.
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 at 80 °C (ionic exchange capacity is 1.51 meq g). 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 at a current density of 1.39 A cm.
阴离子交换膜燃料电池（AEMFCs）因其适应低成本堆叠组件和非贵金属催化剂的能力，已成为质子交换膜燃料电池（PEMFCs）的一种有前途的替代品。然而，阴离子交换膜（AEMs）的碱性耐受性差和 OH 电导率低阻碍了 AEMFCs 的大规模实施。在此，通过一锅超强酸催化反应，报告了一种新型主链中具有冠醚大环的 AEM 的制备。该研究旨在研究冠醚空腔大小对阴离子交换膜的相分离结构、离子电导率和耐碱性的影响。由于冠醚的自组装，具有二苯并-18-冠-6-醚（QAPCE-18-6）的聚（冠醚）（PCE）AEM 表现出明显的相分离结构和在 80°C 时的最大 OH 电导率为 122.5 mS cm（离子交换容量为 1.51 meq g）。尽管在苛刻的碱性条件下处理，QAPCE-18-6 仍具有良好的耐碱性，OH 电导率保留率为 94.5%。此外，装有 QAPCE-18-6 的氢/氧单电池在 1.39 A cm 的电流密度下可实现 574 mW cm 的峰值功率密度（PPD）。
