Research Preparation Of V₂O₅ Nanowire And V₂O₅/Reduced Grapheme Oxide And Their Electrochemical Performances

In recent years,the pollution is becoming more and more serious.Supercapacitors,as a novel energy because of its evirounmentally friendliness have broad prospects in application.The vanadium oxide as supercapacitor electrode materials with high theoretical capacity,rich raw material source and excellent electrochemical performance,have become a research hotspot.The prepared samples were characterized by X-ray powder diffraction（XRD）,scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,cyclic voltammetry（CV）,galvanostatic chargeedischarge（GCD）and Electrochemical impedance spectroscopy（EIS）.1.In this work,the vanadium pentoxidenanomaterials with uniform size of 1μm were synthesized through adjusting the concentration of vanadium pentoxide,H₂O₂ dosage,reaction temperature,reaction time and the concentration of citric acid disodium via a facile hydrothermal process.The results show that V₂O₅ crystal shape,the main diffraction peaks and axial length have a great influence on the electrochemical properties.Orthogonal crystal system main diffraction peaks in 20.2° and 21.7°,the reaction process have both electric double layer capacitors and capacitance.Simultaneously,the electrochemical performance of V₂O₅ nanowires was analyzed in 0.5 M K2SO4,showing that the specific capacitance is 523.91 F/g at the current density of 0.5 A/g,and at the scanning rate of 5 mv/s,the specific capacitance is 528.15 F/g.Besidws,the specific capacitance retention is 68% when the current density increase to 5 A/g.2.The V₂O₅ / RGO powders were prepared by hydrothermal method with adding the concentration of 2 mg/mL graphene oxide.The results show the specific capacitance is 739.16 F/g when the current density at 0.5 A/g which is suporior 40% than other V₂O₅ supercapacitors.Besides,the capacitance retention is 75% when the current increased 5 A/g.3.The V₂O₅ / RGO hydrogel was synthesized via a hydrothermal process and sliced for the electrochemical performance test.The results showed that the performance of hydrogel composition is optimal in 0.4 mg/mL.And Under the condition of 5 mV /s,the specific capacitance is as high as 480.98 F/g and the capacitance retention is 70% form 5 to 100 mV/s.