Division of Energy Storage, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, PR China.
ChemSusChem. 2013 Feb;6(2):328-35. doi: 10.1002/cssc.201200561. Epub 2013 Jan 22.
Anion exchange membranes prepared from quaternized poly(tetramethyl diphenyl ether sulfone) (QAPES) were first investigated in the context of vanadium flow battery (VFB) applications. The membranes showed an impressive suppression effect on vanadium ions. The recorded vanadium permeability was 0.02×10(-7)-0.09×10(-7) cm(2) min(-1), which was two orders of magnitude lower than that of Nafion 115. The self-discharge duration of a VFB single cell with a QAPES membrane is four times longer than that of Nafion 115. The morphological difference in hydrophilic domains between QAPES and Nafion was confirmed by TEM. After soaking the membranes in VO(2)(+) solution, adsorbed vanadium ions can barely be found in QAPES, whereas the hydrophilic domains of Nafion were stained. In the ex situ chemical stability test, QAPES showed a high tolerance to VO(2)(+) and remained intact after immersion in VO(2)(+) solution for over 250 h. The performance of a VFB single cell assembled with QAPES membranes is equal to or even better than that of Nafion 115 and remains stable in a long-term cycle test. These results indicate that QAPES membranes can be an ideal option in the fabrication of high-performance VFBs with low electric capacity loss.
首次研究了季铵化聚（四甲基二苯砜）（QAPES）制备的阴离子交换膜在钒液流电池（VFB）应用中的性能。该膜对钒离子具有显著的抑制作用。记录的钒渗透率为 0.02×10(-7)-0.09×10(-7) cm(2) min(-1)，比 Nafion 115 低两个数量级。采用 QAPES 膜的 VFB 单电池自放电时间是 Nafion 115 的四倍。TEM 证实了 QAPES 和 Nafion 之间亲水区的形态差异。将膜浸泡在 VO(2)(+)溶液中后，几乎无法在 QAPES 中发现吸附的钒离子，而 Nafion 的亲水区被染色。在原位化学稳定性测试中，QAPES 对 VO(2)(+)具有高耐受性，在 VO(2)(+)溶液中浸泡超过 250 小时后仍保持完整。采用 QAPES 膜组装的 VFB 单电池的性能与 Nafion 115 相当甚至更好，并且在长期循环测试中保持稳定。这些结果表明，QAPES 膜在制备具有低容量损耗的高性能 VFB 方面是一种理想的选择。
