【摘要】 以大鳞片石墨为原料，经过氧化插层、剥离和湿法纺丝等步骤，结合碳纳米管引入、还原方式选择和氮掺杂技术，成功制备了介孔结构规则排列的氮掺杂还原氧化石墨烯/碳纳米管（Nitrogen-doped reduced graphene oxide/carbon nanotube, N-RGO/CNT）复合纤维。对比了不同还原方式对纤维微观结构的影响，发现氢碘酸（HI）化学还原导致纤维结构的大孔膨胀，而焦耳热/微波还原使其孔结构连续且规则化，特别是碳纳米管的引入显著改善了纤维的微观形貌，形成了多孔海绵状结构，且孔结构主要为有序的三维介孔。通过焦耳热/微波还原方式制备的N-RGO/CNT复合纤维在抗拉强度、导电率和比表面积等物理性能上表现优异，其中抗拉强度达到252 MPa,导电率为7.9·10³ S·m^-1,比表面积为194 m²·g^-1。进一步测试发现，适度还原的纤维因保留了一定含氧基团，通过参与氧化还原反应显著提升了纤维的比容量。在三电极体系中，N-RGO/CNT纤维可提供高达300 F·cm^-3的比容量。以N-RGO/CNT纤维为电极材料组装的超级电容器在电流密度为34.0 mA·cm^-3时表现出198 F·cm^-3的电容。更多还原

【Abstract】 Using large-flake graphite as the raw material, nitrogen-doped reduced graphene oxide/carbon nanotube（N-RGO/CNT） composite fibers with regularly arranged mesoporous structures were successfully prepared through steps such as oxidation intercalation, stripping, wet spinning, combining carbon nanotube introduction, reduction method selection and nitrogen doping technology. The effects of different reduction methods were compared by a series of experiments. The microstructure of the fibers reveals that hydroiodic acid（HI） chemical reduction made macropore expansion of the fiber structure, while Joule heating/microwave reduction respectively regularizes the pore structure continuously. Especially, the introduction of carbon nanotubes significantly improves the micro-morphology of the fibers, forming a porous sponge-like structure with mainly ordered three-dimensional mesopores. The results show that the N-RGO/CNT composite fibers prepared by thermal reduction exhibit excellent physical properties such as tensile strength, electrical conductivity, and specific surface area. The tensile strength of N-RGO/CNT is 252 MPa, with the electrical conductivity of 7.9×10³ S·m^-1 and the specific surface area of 194 m²·g^-1. Further testing is found that the moderately reduced fibers retain a certain amount of oxygen-containing groups, significantly enhancing the specific capacity of the fibers by participating in redox reactions. In the three-electrode system, the N-RGO/CNT fibers provides a high specific capacity of 300 F·cm^-3. The supercapacitor assembled with N-RGO/CNT fibers as electrode materials exhibits a capacitance of 198 F·cm^-3 at a current density of 34.0 mA·cm^-3.更多还原