二氧化钒/泡沫镍—体化电极材料的制备及其电化学特性研究

采用五氧化二钒,草酸和泡沫镍作为原料,经一步水热反应法,成功制备出二氧化钒/泡沫镍一体化电极.X-射线衍射仪(XRD)和扫描电子显微镜(SEM)用来表征二氧化钒/泡沫镍电极材料的物相和形貌.结果显示,当草酸浓度为0.1 mol·L-1时,制备的二氧化钒具有纳米片状结构,其厚度为80 ～ 140 nm.电化学结果显示,二氧化钒/泡沫镍一体化电极材料,其比电容高达3.99 F·cm-2(在电流密度为1 mA·cm-2),这是由于生长在泡沫镍上片状二氧化钒具有高的比表面积.经过2000次的循环后,二氧化钒/泡沫镍电极的比电容仅损失9.95;,显示很好的循环稳定性.

Preparation and Electrochemical Characteristics of VO2/Nickel Foam Integrating Electrode Materials

The VO2/nickel foam integrating electrode materials were successfully prepared by one-pot hydrothermal approach,using V2O5,oxalic acid and nickel foam as raw materials.The structures and morphologies of VO2/nickel foam electrodes were characterized by (XRD) spectrometry and scanning electron microscopy (SEM).The results indicate that the VO2 shows a nanoflake-structure when the concentration of oxalic acid is 0.1 mol · L-1 this nanoflake-structured of VO2 has a thickness ranges of 80-140 nm.The electrochemical results indicate that the VO2/nickel foam electrode with a nanoflake-structured shows a specific capacitance of 3.99 F · cm-2 at a current density of 1 mA · cm-2 It is ascribed to a high specific surface area of the nanoflake-structured VO2/nickel foam electrode.The nanoflake-structured VO2/nickel foam electrode is recycled for 2000 cycles,only 9.95％ of its specific capacity is lost,exhibits good cycle stability.