Multi-imidazolium cationic clusters cross-linked hydrogenated benzonorbornadiene diblock copolymer anion exchange membranes for improving conductivity and mitigating swelling

作者：Chen, Sixian; Zhang, Anqiang; He, Xiaohui^*; Chen, Defu

来源：Polymer, 2023, 287: 126429.

DOI：10.1016/j.polymer.2023.126429

• Anion exchange membranes
• Hydrogenated benzonorbornadiene diblock
• copolymer
• Cyclotriphosphazene
• Hexa-imidazolium cations clusters
• All-hydrocarbon

Aiming at insufficient conductivity and excessive swelling of anion exchange membranes (AEMs), the benzonorbornadiene structure was introduced into the backbone and cyclotriphosphazene based hexa-imidazolium cations clusters were adopted. Herein, the multi-imidazolium cations clusters cross-linked hydrogenated ben-zonorbornadiene diblock copolymer based AEMs were prepared. The combination of multi-imidazolium cations cluster structure and all-hydrocarbon diblock backbone can substantially enhance the self-assembly ability to facilitate microphase separation. The prepared H-rPBenzoNBD-CTPA-MI-1.68 AEM has low swelling ratio (SR = 13.6%), high OH- conductivity (110.0 mS cm-1), and available alkaline stability at 80 degrees C. It maintains 87.0% of the initial OH- conductivity after 32 days of immersion in 1 M NaOH solution at 80 degrees C. Moreover, the single cell equipped with H-rPBenzoNBD-CTPA-MI-1.68 AEM obtained a maximum power density of 222 mW cm-2 at a current density of 533 mW cm-2. The multi-imidazolium cations clusters cross-linked hydrogenated benzo-norbornadiene diblock copolymer based AEMs have a broad prospect for practical application in fuel cells.

• 单位
  南昌大学