Zejun Zheng, Boxin Xue, Jin Yao, Qingyi He, Zhen Wang, Jingling Yan
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引用次数: 0
摘要
由于缺乏合适的阴离子交换膜（AEM），阴离子交换膜水电解器（AEMWE）的效率和耐用性都很低。在此，我们开发了一种刚性阶梯状聚荧蒽交联剂，用于制备超微孔交联聚荧蒽-聚（联苯哌啶）基 AEM。由于超微孔结构和微相分离形态的协同作用，交联膜显示出很高的羟基电导率（80 oC 时高达 163 mS cm-1）。此外，这些 AEM 还具有适度的吸水性、出色的尺寸稳定性和显著的碱性稳定性。基于 QPBP-PX-15% 并配备非贵金属催化剂的单细胞 AEMWE 在 80 oC 的 6 M KOH 溶液中以 2.03 V（与 PiperION 的 2.26 V 相比）的电压实现了 3000 mA cm-2 的电流密度，其性能优于许多使用铂族金属催化剂的 AEMWE。因此，本研究中开发的交联 AEM 在以浓碱性溶液为原料的 AEMWE 中显示出巨大的应用潜力。
Ultramicroporous Crosslinked Polyxanthene-Poly(biphenyl piperidinium)-based Anion Exchange Membranes for Water Electrolyzers Operating under Highly Alkaline Conditions
Anion exchange membrane water electrolyzers (AEMWEs) suffer from low efficiencies and durability, due to the unavailability of appropriate anion exchange membranes (AEM). Herein, a rigid ladder-like polyxanthene crosslinker was developed for the preparation of ultramicroporous crosslinked polyxanthene-poly(biphenyl piperidinium)-based AEMs. Due to the synergetic effects of ultramicroporous structure and microphase-separation morphology, the crosslinked membranes showed high OH− conductivity (up to 163 mS cm-1 at 80 oC). Furthermore, these AEMs also exhibited moderate water uptake, excellent dimensional stability, and remarkable alkaline stability. The single-cell AEMWE based on QPBP-PX-15% and equipped with non-noble catalysts achieved a current density of 3000 mA cm-2 at 2.03 V (compared to PiperION’s 2.26 V) in 6 M KOH solution at 80 oC, which outperformed many AEMWEs that used platinum-group-metal catalysts. Thus, the crosslinked AEMs developed in this study showed significant potential for applications in AEMWEs fed with concentrated alkaline solutions.
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