Highly conductive fluorine-based anion exchange membranes with robust alkaline durability
Highly conductive fluorine-based anion exchange membranes with robust alkaline durability
复制标题
高导电性氟基阴离子交换膜，具有强大的碱性耐久性
DOI：
10.1039/d0ta04350h
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发表时间：
2020-07-14
影响因子：
11.9
通讯作者：
Liu, Qing Lin
中科院分区：
文献类型：
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作者：
Gao, Xue Lang;Sun, Li Xuan;Liu, Qing Lin
具有强碱性稳定性和高离子电导率的阴离子交换膜（AEM）是有前途的电化学能量转换装置-燃料电池的迫切需要。本文制备了一系列新型的具有疏水性氟基聚合物主链和亲水性长柔性多阳离子侧链的交联AEM。形态学观察和离子传输分析证实了存在不同的微相分离和有效的离子传导通道内的膜所产生的固有的化学结构。TQ-PDBA-70%（IEC = 2.16 meq. g（-1））。同时，制备的TQ-PDBA-XAEMs具有理想的溶胀比（22.8 MPa）。值得注意的是，TQ-PDBA-70% AEM在80 ° C下浸入1、2、4、8和10 M KOH中1000小时后，保留的离子电导率分别为98.14%、95.50%、77.90%、72.02%和58.15%。FT-IR分析表明，TQ-PDBA-70% AEM在碱稳定性试验前后的化学结构变化很小，而且TQ-PDBA-70% AEM具有较高的离子交换容量（IEC）保持率，并保持了良好的机械性能。用TQ-PDBA-70%组装的单电池在360 mA cm（-2）的电流密度下具有158.8 mW cm（-2）的最大功率密度。这些结果表明，这种类型的结构开辟了一个新的战略，发展高性能的AEM。
Anion exchange membranes (AEMs) with robust alkaline stability and high ionic conductivity are imminently required for the promising electrochemical energy conversion devices - fuel cells. Herein, a series of novel crosslinked AEMs with hydrophobic fluorine-based polymer backbones bearing special functional sites and hydrophilic long flexible multi-cation side chains are prepared. Morphology observation and ion transport analysis confirm the existence of distinct microphase separation and efficient ion-conducting channels within the membranes resulting from the inherent chemical structure. A highest ionic conductivity of 136.27 mS cm(-1)can be achieved by TQ-PDBA-70% (IEC = 2.16 meq. g(-1)) at 80 degrees C. Meanwhile, the prepared TQ-PDBA-XAEMs exhibit a desirable swelling ratio ( 22.8 MPa). It is worth noting that the retained ionic conductivity of the TQ-PDBA-70% AEM is 98.14%, 95.50%, 77.90%, 72.02% and 58.15% after being immersed in 1, 2, 4, 8 and 10 M KOH at 80 degrees C for 1000 h, respectively. Chemical structure change of the TQ-PDBA-70% AEM before and after the alkaline stability test is negligible, as revealed by FT-IR. Moreover, TQ-PDBA-70% has high ionic exchange capacity (IEC) retention and maintains good mechanical properties. A single cell assembled with TQ-PDBA-70% has a maximum power density of 158.8 mW cm(-2)under a current density of 360 mA cm(-2). These results suggest that this type of structure opens a new strategy for developing high performance AEMs.