Ultramicroporous Crosslinked Polyxanthene-Poly(biphenyl piperidinium)-based Anion Exchange Membranes for Water Electrolyzers Operating under Highly Alkaline Conditions
Zejun Zheng, Boxin Xue, Jin Yao, Qingyi He, Zhen Wang, Jingling Yan
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引用次数: 0
Abstract
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.