Highly conductive fluorine-based anion exchange membranes with robust alkaline durability,Journal of Materials Chemistry A

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Highly conductive fluorine-based anion exchange membranes with robust alkaline durability
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-06-11 , DOI: 10.1039/d0ta04350h
Xue Lang Gao _{1,

2,

3,

4,

5} , Li Xuan Sun _{1,

2,

3,

4,

5} , Hong Yue Wu _{1,

2,

3,

4,

5} , Zhao Yu Zhu _{1,

2,

3,

4,

5} , Nan Xiao _{1,

2,

3,

4,

5} , Jia Hui Chen _{1,

2,

3,

4,

5} , Qian Yang _{1,

2,

3,

4,

5} , Qiu Gen Zhang _{1,

2,

3,

4,

5} , Ai Mei Zhu _{1,

2,

3,

4,

5} , Qing Lin Liu _{1,

2,

3,

4,

5}

Affiliation

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 °C. Meanwhile, the prepared TQ-PDBA-X AEMs exhibit a desirable swelling ratio (<10%) and excellent mechanical properties (tensile stress > 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 °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.

中文翻译：

高导电性氟基阴离子交换膜，具有强大的碱性耐久性

具有前景的电化学能量转换设备–燃料电池迫切需要具有强大的碱性稳定性和高离子电导率的阴离子交换膜（AEM）。本文中，制备了一系列具有疏水性氟基聚合物主链的新型交联AEM，该主链带有特殊的功能位点和亲水性长柔性多阳离子侧链。形态学观察和离子迁移分析证实，固有的化学结构导致膜内存在明显的微相分离和有效的离子传导通道。的136.27毫秒厘米甲最高的离子传导性^-1可通过TQ-PDBA-70％来实现（IEC = 2.16毫克当量克^-1在80℃）°。同时，准备好的TQ-PDBA- XAEM表现出理想的溶胀率（<10％）和出色的机械性能（拉应力> 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后保留的离子电导率为98.14％，95.50％，77.90％，72.02％和58.15％。分别在1000°C和1000°C下放置。FT-IR显示，在碱稳定性试验前后，TQ-PDBA-70％AEM的化学结构变化可忽略不计。此外，TQ-PDBA-70％具有高离子交换容量（IEC）保持力并保持良好的机械性能。与TQ-PDBA-70％组装的单电池具有158.8毫瓦厘米的最大功率密度^-2的360毫安cm 2的电流密度下^-2。这些结果表明，这种类型的结构为开发高性能AEM开辟了新的战略。

更新日期：2020-07-07

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