磺化聚醚醚酮(SPEEK)由于质子传导率较低,限制了其在质子交换膜领域的发展。而金属有机框架材料(MOFs)在提高质子传导率方面具有巨大潜力。因此,制备了UiO-66-NH2、UiO-66-SO3H复合SPEEK质子交换膜,并对复合膜的热稳定性能、溶胀度、吸水率和质子传导率进行了研究。结果表明,复合膜具有优异的热稳定性能;由于UiO-66-NH2和UiO-66-SO3H能够抑制聚合物链的移动,复合膜的溶胀度小于SPEEK膜,尺寸稳定性能优于SPEEK膜;UiO-66-NH2和UiO-66-SO3H的孔状结构具有较强的储存水的能力,赋予复合膜较强的保水能力,其吸水率高于SPEEK膜;较高的保水能力能够为质子迁移提供充足的水分,因此复合膜的质子传导率高于SPEEK膜,其中SPEEK/UiO-66-SO3H的质子传导率可达20.73mS/cm,比SPEEK膜增大了1.12倍。因为具有优异的稳定性能和质子传导率,该复合膜在燃料电池领域具有广阔的应用前景。
The development of sulfonated polyether ether ketone (SPEEK) in the field of proton exchange membranes is limited because of its lower proton conductivity.In contrast,metal-organic framework materials (MOFs) have great potential in improving proton conductivity.Herein,UiO-66-NH2 and UiO-66-SO3H composite SPEEK proton exchange membranes were prepared,and the thermal stability,swelling degree,water uptake,and proton conductivity of the composite membranes were studied.The results showed that the composite membranes had excellent thermal stability.Because the UiO-66-NH2 and UiO-66-SO3H could inhibit the movement of polymer chains,the swelling degree of the composite membranes were lower than that of the SPEEK membrane,and their size stabilities were better than that of the SPEEK membrane.The porous structures of UiO-66-NH2 and UiO-66-SO3H had strong water storage capacity,endowing the composite membrane with strong water retention ability,and its water uptake was higher than that of the SPEEK membrane;The higher water retention capacity could provide sufficient water for proton migration,so the proton conductivity of the composite membranes were higher than that of the SPEEK membrane.Among them,the proton conductivity of the composite membrane SPEEK/UiO-66-SO3H could reach 20.73mS/cm,which was 1.12 times higher than that of the SPEEK membrane.The composite membranes presented excellent stabilities and proton conductivities,making them broad application prospect in the field of fuel cells.
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基金资助
河北省高等学校科学研究项目(科学技术)(ZC2024130);衡水学院校级科研项目(2023ZRZ03,2023XJZX18,2023ZRY17);“河北省湿地保护与绿色发展协同创新中心”专项课题(2024XTCX019)
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