聚丙烯腈(PAN)纳米纤维纸具有高孔隙率、三维连通等特点,其炭化后形成的碳纤维纸可应用于燃料电池质子交换膜中.提升PAN纳米纤维性能,有利于获得高质量碳纤维纸.文中采用碳纳米管(CNT)增强改性聚丙烯腈,通过静电纺丝制备CNT/PAN纳米纤维膜,研究了CNT的加入对纤维膜微观结构、热稳定性、导电性的影响.对纤维膜的扫描电镜照片、热稳定性等进行分析,结果表明CNT质量分数为2%时,纤维膜的孔隙率为86%、比表面积为21.1 m2/g;相较未加CNT的纤维膜的电阻下降40%,最大热分解温度提升了6℃.为后期制备电池用高性能碳纤维纸前驱体提供了支撑.
Polyacrylonitrile(PAN)nanofiber paper has the characteristics of high porosity and three-dimensional connectivity.After carbonization,carbon fiber paper can be used in fuel cell proton exchange membrane.Improving the performance of PAN nanofibers helps to obtain high-quality carbon fiber paper.In this paper,carbon nanotube(CNT)was used to reinforce polyacrylonitrile and CNT/PAN nanofiber membranes were prepared by electrospinning.The effects of CNT on the microstructure,thermal stability and conductivity of the fiber membranes were studied.The SEM images and thermal stability of the fiber membranes were analyzed.The results show that when the mass fraction of CNT is 2%,the porosity and specific surface area of the fiber membrane are 86%and 21.1 m2/g,respectively.Compared with the fiber membrane without CNT,the resistance of the fiber membrane is decreased by 40%,and the maximum thermal decomposition temperature increases by 6℃.This study laid a foundation for the preparation of high-performance carbon fiber paper precursors for batteries.