Achieving High Conductivity at Low Ion Exchange Capacity for Anion Exchange Membranes with Electrospun Polyelectrolyte Nanofibers,ACS Applied Energy Materials

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Achieving High Conductivity at Low Ion Exchange Capacity for Anion Exchange Membranes with Electrospun Polyelectrolyte Nanofibers
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-10-21 , DOI: 10.1021/acsaem.0c01728
Hanzhao Duan ₁ , Xia Cheng ₁ , Lingping Zeng ₁ , Qiang Liao ₂ , Jianchuan Wang ₁ , Zidong Wei ₁

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There has been a “trade-off” between ion exchange capacity (IEC) and mechanical properties in anion exchange membranes. Thinking out of the box, high ion conductivity was realized with only a small amount of ion exchange groups (means low IEC) in this work, by way of constructing highly effective ion channels with electrospun polyelectrolyte nanofibers. At a low IEC of 1.02 mmol g^–1, the conductivity of quaternized poly(2,6-dimethyl-1,4-phenylene oxide) nanofiber (QPPONF)/poly(vinyl alcohol) (QPPONF/PVA) composite membranes achieved was 51.5 mS cm^–1 at 60 °C, which was much higher than that of the homogenous QPPO casting membrane (20.3 mS cm^–1 at 60 °C, IEC = 1.04 mmol g^–1). Moreover, 70 wt % QPPONF/PVA composite membrane exhibits an excellent peak power density of 791 mW cm^–2 in the H₂/O₂ fuel cell test.

中文翻译：

电纺聚电解质纳米纤维在低离子交换容量下实现高电导率的阴离子交换膜

阴离子交换膜的离子交换容量（IEC）与机械性能之间存在“折衷”。开箱即用的想法是，通过使用电纺聚电解质纳米纤维构建高效的离子通道，在这项工作中仅使用少量的离子交换基团即可实现高离子电导率（意味着低IEC）。在1.02 mmol g ^–1的低IEC下，季铵化的聚（2,6-二甲基-1,4-苯撑氧）纳米纤维（QPPONF）/聚（乙烯醇）（QPPONF / PVA）复合膜的电导率为51.5在60°C时mS cm ^–1，远高于同质QPPO流延膜（在60°C时20.3 mS cm ^–1，IEC = 1.04 mmol g ^–1）。此外，在H ₂ / O ₂燃料电池测试中，重量百分比为70％的QPPONF / PVA复合膜表现出791 mW cm ^-2的出色峰值功率密度。

更新日期：2020-11-23

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