Son Tae Yang, Im Kwang Seop, Jung Ha Neul, Nam Sang Yong
Department of Materials Engineering and Convergence Technology, Research Institute for Green Energy Convergence Technology, Gyeongsang National University, Jinju 52828, Korea.
Polymers (Basel). 2021 Aug 23;13(16):2827. doi: 10.3390/polym13162827.
In this study, blended anion exchange membranes were prepared using polyphenylene oxide containing quaternary ammonium groups and polyvinylidene fluoride. A polyvinylidene fluoride with high hydrophobicity was blended in to lower the vanadium ion permeability, which increased when the hydrophilicity increased. At the same time, the dimensional stability also improved due to the excellent physical properties of polyvinylidene fluoride. Subsequently, permeation of the vanadium ions was prevented due to the positive charge of the anion exchange membrane, and thus the permeability was relatively lower than that of a commercial proton exchange membrane. Due to the above properties, the self-discharge of the blended anion exchange membrane (30.1 h for QA-PPO/PVDF(2/8)) was also lower than that of the commercial proton exchange membrane (27.9 h for Nafion), and it was confirmed that it was an applicable candidate for vanadium redox flow batteries.
在本研究中，使用含季铵基团的聚亚苯基氧化物和聚偏二氟乙烯制备了共混阴离子交换膜。混入高疏水性的聚偏二氟乙烯以降低钒离子渗透率，当亲水性增加时钒离子渗透率会升高。同时，由于聚偏二氟乙烯优异的物理性能，尺寸稳定性也得到了改善。随后，由于阴离子交换膜的正电荷，钒离子的渗透被阻止，因此其渗透率相对低于商用质子交换膜。由于上述特性，共混阴离子交换膜（QA-PPO/PVDF(2/8)为30.1小时）的自放电也低于商用质子交换膜（Nafion为27.9小时），并且证实它是钒氧化还原液流电池的适用候选材料。
