Yu Ze, Gao Wei Ting, Liu Ying Jie, Zhang Qiu Gen, Zhu Ai Mei, Liu Qing Lin
Department of Chemical & Biochemical Engineering, Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, The College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, PR China.
Department of Chemical & Biochemical Engineering, Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, The College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, PR China.
J Colloid Interface Sci. 2023 Dec;651:404-414. doi: 10.1016/j.jcis.2023.08.011. Epub 2023 Aug 3.
Anion exchange membrane fuel cells (AEMFCs), which are more economical than proton exchange membrane fuel cells (PEMFCs), stand out in the context of the rapid development of renewable energy. Superacid-catalyzed ether-free aromatic polymers have recently received a lot of attention due to their exceptional performance, but their development has been hampered by the trade-off between the dimensional stability and ionic conductivity of anion exchange membranes (AEMs). Here, we introduced fluoroketones containing different numbers of fluorinated groups (x = 0, 3 and 6) in the main chain of p-terphenyl piperidine because of the favorable hydrophobic properties of fluorinated groups. The results show that fluorinated AEMs can enhance OH conductivity by building more aggregated hydrophilic channels while ensuring dimensional stability. The PTF6-QAPTP AEM with more fluorinated groups has the most excellent performance at 80 °C with an OH conductivity of 142.7 mS cm and a swelling ratio (SR) of only 4.55 %. Additionally, it exhibits good alkali durability, with the OH conductivity and quaternary ammonium (QA) cation retaining at 93.45% and 92.6%, respectively, after immersion in a 2 M NaOH solution at 80 °C for 1200 h. In addition, the power density of the PTF6-QAPTP based single cell reaches 849 mW cm when the current density is 1600 mA cm. The PTF6-QAPTP based cell has a voltage retention of 88% after 80 h of stability testing at a constant current density of 300 mA cm at 80 °C.
阴离子交换膜燃料电池（AEMFCs）在可再生能源快速发展的背景下脱颖而出，它比质子交换膜燃料电池（PEMFCs）更经济。超酸催化的无醚芳香族聚合物因其卓越的性能最近受到了广泛关注，但其发展受到阴离子交换膜（AEMs）尺寸稳定性和离子电导率之间权衡的阻碍。在此，由于氟代基团具有良好的疏水性能，我们在对三联苯哌啶的主链中引入了含不同氟代基团数量（x = 0、3和6）的氟代酮。结果表明，氟化AEMs可以在确保尺寸稳定性的同时，通过构建更多聚集的亲水通道来提高OH电导率。具有更多氟代基团的PTF6 - QAPTP AEM在80°C时表现出最优异的性能，OH电导率为142.7 mS/cm，溶胀率（SR）仅为4.55%。此外，它还表现出良好的耐碱性，在80°C下于2 M NaOH溶液中浸泡1200 h后，OH电导率和季铵（QA）阳离子分别保留在93.45%和92.6%。此外，基于PTF6 - QAPTP的单电池在电流密度为1600 mA/cm²时，功率密度达到849 mW/cm²。基于PTF6 - QAPTP的电池在80°C下以300 mA/cm²的恒定电流密度进行80 h稳定性测试后，电压保持率为88%。
