星状VO_2纳米结构的制备及电化学性能研究  

Fabrication and Electrochemical Properties of the Star-like VO_2 Nanostructure Materials

作　　者：袁江涛[1] 李坤振 刘中飞[1] 熊狂伟[1] 金绍维[1,2] 王佩红 

机构地区：[1]安徽大学物理与材料科学学院,合肥230601 [2]安徽省信息材料与器件重点实验室,合肥230601

出　　处：《人工晶体学报》2018年第1期71-76,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(61671017)

摘　　要：以草酸和五氧化二矾为原料,通过水热法制备出电化学性能优异的星状VO_2纳米材料。应用X-射线衍射仪(XRD)、X-射线光电子能谱仪(XPS)和扫描电子显微镜(SEM)等设备分别对样品的物相、元素组成及价态和形貌进行表征。电化学结果显示,星状VO_2纳米结构在0.2 A·g^(-1)的电流密度下,其比电容高达574.75 F·g^(-1),且能量密度为51.09 Wh·kg^(-1)。经过4250次循环充放电后,星状VO_2比电容仍保持90.2%,表现出极高的电容性能。The star-like VO2 nanostructures were successfully fabricated via hydrothermal method as high- performance electrode material, using V205 and oxalic acid as raw materials. The phase compositions, element and electronic valence state, and morphologies of the samples were characterized by X-ray diffraction spectrometry （XRD）, X-ray photoelectron spectra （XPS） and scanning electron microscopy （SEM）, respectively. The electrochemistry measurements show that the star-like VO2 having a specific capacitance of 574.75 F ·g-1 at a current density of 0.2 A ·g-1, and achieves a high energy density of 51.09 Wh ·kg^-1 The star-like VO2 has good cycling stability with capacitance retention of 90.2% after 4250 charge-discharge cycles, which exhibits an excellent capacitance performance.

关 键 词：星状二氧化钒 电极材料 比电容 能量密度 

分 类 号：O614[理学—无机化学]