A series of mechanically robust and highly conducting crosslinked anion-exchange membranes are synthesized by using quaternary phosphonium-functionalized poly(ether ether ketone) (QPPEEK) as base polymer and poly(ethylene glycol) (PEG) as the crosslinker. The crosslinked membrane containing both rigid and flexible polymer constituents (QPPEEK-PEG) revealed better flexibility and mechanical strength, and higher conductivity than the pristine QPPEEK membrane. The mechanical properties and ionic conductivity of the crosslinked membranes are tuned by the mass fractions of the QPPEEK and PEG components. Among the different QPPEEK and PEG compositions, the QPPEEK-PEG 20 (QPPEEK:PEG 80:20) membrane has the best properties, reaching a hydroxide conductivity of 102 mS cm⁻¹ at 80 ᵒC, a tensile strength of 13.7 MPa, and 48% of elongation. The membrane is chemically stable in alkaline environment, retaining 85% of its initial conductivity and mechanical strength after being exposed to 1 M KOH at 80 °C for 400 h. Finally, in the operando anion-exchange membrane fuel cell the QPPEEK-PEG 20 crosslinked membrane performs well, displaying an open-circuit voltage of 1.05 V and a maximum power density of 154 mW cm⁻² measured at 0.55 V, showing the potential of PEEK-based membranes for fuel cell applications.

以季phospho官能化的聚醚醚酮（QPPEEK）为基础聚合物，聚乙二醇（PEG）为交联剂，合成了一系列机械强度高，导电性高的交联阴离子交换膜。与原始QPPEEK膜相比，同时包含刚性和柔性聚合物成分（QPPEEK-PEG）的交联膜表现出更好的柔韧性和机械强度，以及更高的电导率。交联膜的机械性能和离子电导率通过QPPEEK和PEG组分的质量分数进行调节。在不同的QPPEEK和PEG成分中，QPPEEK-PEG 20（QPPEEK：PEG 80:20）膜具有最佳性能，氢氧化物电导率达到102 mS cm ^-1在80℃下的拉伸强度为13.7 MPa，伸长率为48％。该膜在碱性环境下化学稳定，在80°C的1 M KOH中暴露400 h后，仍保持其初始电导率和机械强度的85％。最后，在操作性阴离子交换膜燃料电池中，QPPEEK-PEG 20交联膜表现良好，显示出1.05 V的开路电压和在0.55 V下测得的最大功率密度154 mW cm ^-2，显示出用于燃料电池的基于PEEK的膜。