ABSTRACT

We have synthesized new electrode material for the supercapacitor application. Polyoxovanadates (POVs) have been used for energy storage electrode materials due to their fast multi-electron redox properties. The formation of SDV/GO composites was confirmed using various analytical methods, e.g., Fourier transforms infrared spectroscopy (FTIR) and powder X-ray diffraction (XRD), followed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The composite electrode’s electrochemical behavior was studied using a neutral 1 M sodium sulphate (Na2SO4) solution in three-electrode cyclic voltammetry (CV) system. The SDV/GO composite electrode showed a specific capacitance of 306 F/g for a scan rate of 5 mV/s and a corresponding energy density of 42.4 Wh/Kg. Galvanostatic charge/discharge exhibits a specific capacitance of 310 F/g with energy densities of 43.08 Wh/kg. Electrochemical impedance spectroscopy (EIS), which was used to investigate interface property, yielded a considerably higher power density of 172.41 KW/kg with an equivalent series resistance of 5 Ω.

摘要

我们为超级电容器应用合成了新的电极材料。聚氧钒酸盐（POV）由于其快速的多电子氧化还原特性，已被用于储能电极材料。SDV/GO 复合材料的形成通过各种分析方法得到证实，例如傅里叶变换红外光谱 (FTIR) 和粉末 X 射线衍射 (XRD)，然后是扫描电子显微镜 (SEM) 和透射电子显微镜 (TEM)。在三电极循环伏安 (CV) 系统中使用中性 1 M 硫酸钠 (Na2SO4) 溶液研究复合电极的电化学行为。SDV/GO复合电极在5 mV/s的扫描速率下显示出306 F/g的比电容和42.4 Wh/Kg的相应能量密度。恒电流充电/放电的比电容为 310 F/g，能量密度为 43.08 Wh/kg。用于研究界面特性的电化学阻抗谱 (EIS) 产生了相当高的功率密度，为 172.41 KW/kg，等效串联电阻为 5 Ω。