论文部分内容阅读
采用微乳–超临界干燥法制备了Zn2+掺杂针状Zn0.34Fe2.66O4纳米晶。利用红外光谱仪、能谱仪、X射线衍射仪和透射电子显微镜对样品的晶体结构、化学组成、粒径和形貌进行表征。结果表明:产物为形貌规整的针状,长径比明显小于Fe3O4的。通过循环伏安、恒流充放电和交流阻抗等方法研究了Zn0.34Fe2.66O4电极的电化学性能,结果表明:在1mol/L H2SO4溶液中,在0～1.6V(vs饱和甘汞电极)电位范围内,Zn2+掺杂Zn0.34Fe2.66O4材料的电活性和循环稳定性、可逆性优于Fe3O4的。在1A/g电流密度下,单电极比容量达1116F/g,大电流充放电性能良好。
Zn2 + doped acicular Zn0.34Fe2.66O4 nanocrystals were prepared by microemulsion-supercritical drying. The crystal structure, chemical composition, particle size and morphology of the samples were characterized by infrared spectroscopy, energy dispersive spectroscopy, X-ray diffraction and transmission electron microscopy. The results showed that the product was a needle-shaped morphology, and the aspect ratio was significantly smaller than that of Fe3O4. The electrochemical performance of Zn0.34Fe2.66O4 electrode was investigated by cyclic voltammetry, constant current charge and discharge and AC impedance. The results showed that the electrochemical performance of Zn0.34Fe2.66O4 electrode was improved at 0 ~ 1.6V (vs saturated calomel electrode) in 1mol / Potential range, Zn2 + doped Zn0.34Fe2.66O4 materials, electrical activity and cycle stability, reversibility is better than Fe3O4. Under 1A / g current density, the specific capacity of single electrode reaches 1116F / g, and the charge and discharge performance of high current is good.