摘要：为提高ZnFe₂O₄的电化学性能, 采用一步溶剂热法合成ZnFe₂O₄纳米粒子-石墨烯复合材料, 对其进行X射线衍射、扫描电子显微镜、透射电子显微镜表征和电化学性能分析。结果表明:该方法可防止二维层状结构石墨烯团聚, 把ZnFe₂O₄颗粒粒径控制在纳米级且均匀地附着到石墨烯片层上;复合材料呈现二维层状结构, 比表面积达到180 m²/g, 有效增加活性位点数量;当电流密度为1 A/g时, 复合材料电极的比电容达到180.9 F/g, 电化学性能优于纯ZnFe₂O₄电极。

关键词：ZnFe₂O₄；纳米粒子；石墨烯；超级电容器

Abstract：In order to improve the electrochemical properties of ZnFe₂O₄, a simple and low-cost one-step solvothermal method for synthesizing ZnFe₂O₄ nanoparticles-graphene composites was designed. The composites were characterized by X ray diffraction, scanning electron microscopy and transmission electron microscopy, and analysised by electrochemical workstation. The results show that the method not only prevents the agglomeration of two-dimensional layered graphene, but also controls the size of ZnFe₂O₄ particles at the nanoscale and uniformly adheres to the graphene sheet. The specific surface area can reach up to 180 m²/g and the number of active sites were increased effectively due to the two-dimensional layered structure and the exceedingly good conductivity of grapheme. The specific capacitance of ZnFe₂O₄ nanoparticles-graphene composites electrode reaches 180.9 F/g when the current density is 1 A/g, indicating the better electrochemical performance than the pure ZnFe₂O₄ electrode.

Keywords: ZnFe₂O₄； nanoparticles； graphene； supercapacitor