Simple Preparation Of Metal Vanadium Oxide Nanomaterials And Its Optical/Electrical Properties

As an important technology,nanomaterials have attracted much attention from researchers in recent years.As a member of nanomaterials,metal vanadium oxide nanomaterials'performance is excellent.They perform well in photocatalysis,and they are excellent in handling pollution.What's more,they have high sensitivity in electrochemical detection,and they can be used for some detection tasks.The application of the negative electrode has a large specific capacity and cycle stability.Therefore,the development and the application of metal vanadium oxide nanomaterials are expected to replace some traditional materials.Metal vanadium oxide nanomaterials become to be a part of our daily lives.Compared with other traditional lithium-ion battery anode materials,metal vanadium oxide has the advantages of rich resources,no pollution to the environment,and large specific capacity.Therefore,it is expected to replace traditional anode materials and become a new-generation lithium-ion battery anode material.The photocatalytic performance of the metal vanadium oxide is also extremely excellent,and the catalytic efficiency for various organic dyes is extremely high.In this paper,micro-nano-scale metal vanadium oxide materials were successfully prepared by a simple and green method:Mn?VO₃?₂ nano-flowers and FeV₃O₈nano-rods.We used X-ray diffractometer?XRD?,Fourier infrared spectrometer?FTIR?,N₂ adsorption-desorption isotherm?BET?,scanning electron microscope?SEM?,field emission scanning electron microscope?FESEM?and other test methods to characterize the phase structure and morphology of the prepared metal vanadium oxide nanomaterials.In this dissertation,Mn?VO₃?₂ nano-flowers materials were combined with polypyrrole?PPy?,and the resulting composite material were used as cathode materials to assemble a button-shaped lithium ion battery.The electrochemical performance of the button-shaped lithium ion battery was tested by an electrochemical workstation and a blue electricity system.FeV₃O₈ nanorods were used as catalyst,with the assistance of hydrogen peroxide catalyticing organic dye Rhodamine B with xenon lamp.The photocatalytic performance was tested by using a xenon lamp and UV-visible spectrophotometer.In addition,by controlling the reaction conditions,the morphology formation conditions and growth mechanism of Mn?VO₃?₂nanoflowers and FeV₃O₈ nanorods were explored.The main researches of this paper are as follows:?1?NH₄VO₃ and MnCl₂·2H₂O were used as the initial reactants?no pretreatment required?,and the reaction solvent was an alcohol-water mixture?ethylene glycol:water=1:1?at 120°C by Solvothermal method.The precursor,calcined and dehydrated,successfully prepared Mn?VO₃?₂nanoflowers.Mn?VO₃?₂ nanoflowers have clear outline.The diameter of the nanoflower is 5-10 microns.These nanoflowers are composed of nano petals with a thickness of tens of nanometers.Many gaps,the specific surface area is very large.By adjusting the parameters such as reaction time and reactant anions,the best growth conditions of Mn?VO₃?₂ nanoflowers were explored.The growth mechanism of Mn?VO₃?₂ provided a reference for the preparation of other vanadium compounds.Mn?VO₃?₂ was compounded with pyrrole to form Mn?VO₃?₂@PPy composite materials.The electrochemical performance of Mn?VO₃?₂@PPy nanoflowers were studied using an electrochemical workstation and blue-electric system.The performance test conditions were:the battery capacity is 102.6 mAh g^-1 at a current density of 0.1 A g^-1.In addition,they have a capacity of 75.3 mAh g^-1 at a current density of 1 A g^-1at a voltage of 1.5-4.5 V,and their capacity is close to 60 mAh g^-1 after 100cycles.These experimental results show that the Mn?VO₃?₂@PPy nanoflowers can be used as a cathode for lithium ion batteries.?2?We used NH₄VO₃,C₂H₆O₆ and Fe Cl₃ as the initial reactants,using CH₃COOH to adjust pH,and placed the solution at 180°C for 24 h,successfully preparing FeV₃O₈ nanorods.The FeV₃O₈ nanorod is about 1micron long and 80-150 nm wide.We explored the best conditions for forming it by changing parameters such as reactant anions.FeV₃O₈ nanorods were used as catalyst,with the assistance of hydrogen peroxide Catalyticing organic dye Rhodamine B with xenon lamp.It is found that its catalytic performance is excellent,and the catalytic effect can reach 98.1%in 25 min under the irradiation of xenon lamp.FeV₃O₈ nanorods are expected to serve as new catalysts for photodegradation of organic pollutants.