石墨烯掺杂对木质素基碳纳米纤维电化学性能影响的研究

Effect of Graphene Doping on the Electrochemical Properties of Lignin-based Carbon Nanofibers

中文关键词:  木质素  石墨烯  静电纺丝  电极  超级电容器

中文摘要:

      以木质素为硫源和碳源，聚丙烯腈为氮源和助纺剂，经静电纺丝、碳化和活化等步骤成功制备出了N、S共掺杂的碳纳米纤维。同时在纺丝液中掺杂石墨烯（GNs），利用GNs对N、S的吸附固定作用，提高碳纤维中杂原子含量，以该碳纳米纤维材料为活性物质，制备得到超级电容器。结果表明，制备的超级电容器在以6 mol/L KOH为电解液的双电极系统中具有良好的电化学性能，GNs掺杂前后超级电容器比电容从114.6 F/g增大到253.4 F/g，等效串联电阻从24.1 Ω减少到6.8 Ω，能量密度从3.96 Wh/kg提高到8.99 Wh/kg。

Abstract:

      In this study, N and S co-doped carbon nanometer active fibers were prepared by electrostatic spinning, carbonization and activation with lignin as sulfur and carbon source and polyacrylonitrile as nitrogen source and spinning aid. At the same time, graphenes (GNs) were doped in the spinning liquid, and the adsorption and fixation effects of GNs on N and S were utilized to increase the heteroatom content in carbon fiber. The carbon material was used as the active material to prepare the supercapacitor. The results showed that the preparation of supercapacitor in 6 mol/L KOH electrolyte electrode system had good electrochemical properties, compared with supercapacitor before GNs doped, specific capacitance increased from 114.6 F/g to 253.4 F/g, the equivalent series resistance reduced from 24.1 Ω to 6.8 Ω, the energy density increased from 3.96 Wh/kg to 8.99 Wh/kg.