Fe_2O_3/ZnFe_2O_4/C复合材料的制备及其电化学性能

Preparation and Electrochemical Performance of Fe_2O_3/ZnFe_2O_4/C Composite

本文以葡萄糖作为碳源,采用溶剂热法进行原位碳包覆合成了Fe_2O_3/ZnFe_2O_4/C材料,研究了材料的结构及电化学性能。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、循环伏安扫描(CV)和恒流充放电技术对材料结构及电化学性能进行了表征。结果表明,采用此法合成的Fe_2O_3/ZnFe_2O_4/C复合材料呈现多孔结构,粒径约为250nm,经历40次循环后材料的可逆容量依然能保持在645.7mAh/g,较未包覆碳材料的电极提高了19.0%,其可逆容量和循环稳定性能得到了显著提升。

Fe_2O_3/ZnFe_2O_4/C composite material was prepared by a solvothermal and in-situ carbon coating method using glucose as carbon source.Structure and electrochemical performance of the composite material were characterized by means of X-ray diffraction（XRD）,scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,cyclic voltammetry and galvanostatic charge-discharge techniques.The results indicate that the Fe_2O_3/ZnFe_2O_4/C composite material synthesized using the above method shows a porous structure and the average particle size is about 250 nm.Electrochemical measurements show that the material exhibits a good reversible capacity of 645.7mAh/g after 40 cycles,and it is improved by 19.0%compared with Fe_2O_3/ZnFe_2O_4 material.The reversible capacity and the cycling stability of obtained material are obviously enhanced.