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

通信作者简介：

曹丙强（1978—），男，博士，教授，博士生导师，研究方向为新能源材料与器件。E-mail：mse_caobq@ujn.edu.cn。

杨树华（1986—），男，博士，讲师，研究方向为新能源材料与器件。E-mail：yangshuhua78@163.com。