氧化石墨烯量子点/聚丙烯腈纳米纤维复合质子交换膜的制备及其性能

Preparation and properties of proton exchange membrane made from graphene oxide quantum dots/polyacrylonitrile nanofiber composites

为提高全氟磺酸(Nafion)膜的质子传导率和尺寸稳定性,利用静电纺丝技术制备了氧化石墨烯量子点(GOQDs)/聚丙烯腈(PAN)纳米纤维膜,并通过Nafion溶液浸渍法制备了纳米纤维复合质子交换膜。借助扫描电子显微镜、共聚焦显微镜、热重分析仪和X射线衍射仪等对纳米纤维及复合膜的结构和性能进行表征。结果表明:GOQDs在PAN纳米纤维中均匀分布,GOQDs的加入减小了纳米纤维的直径;纳米纤维形成三维网络结构,对复合膜起到了骨架支撑作用,提高了复合膜的尺寸稳定性,同时提高了复合膜的热稳定性和吸水性;GOQDs质量分数的增加提高了复合膜的质子传导率,80℃时复合膜的质子传导率最高可达0.182 S/cm。

In order to improve the proton conductivity and dimensional stability of the Nafion proton exchange membrane,a well-designed structure is in high demand.A graphene oxide quantum dot(GOQDs)/polyacrylonitrile(PAN)nanofiber membrane was prepared by electrostatic spinning technology,and a nanofiber composite proton exchange membrane was prepared by Nafion solution impregnation method.The structures and properties of nanofibers and composite membranes were characterized by scanning electron microscope,confocal microscopy,thermal gravimetric analyzer and X-ray diffractometer.The results show that GOQDs are evenly distributed in PAN nanofibers,and the addition of GOQDs reduces the diameter of the nanofiber.The three-dimensional network structure of nanofibers plays a skeletal support role in the composite membrane,which improves the dimensional stability of the composite membrane.At the same time,the thermal stability and water absorption of the composite membrane is improved.With the increase of GOQDs mass fraction,the proton conductivity of the composite membrane is improved,and the maximum proton conductivity of the composite membrane reaches 0.182 S/cm at 80℃.