Preparation And Properties Of Nanocrystalline Composite Transition Metal Oxides As Supercapacitor Cathode Materials

Supercapacitor is a new type of green large capacity energy storage device.Its performance is superior to traditional energy storage methods such as batteries.It has the characteristics of high specific capacity,fast charging and discharging speed,no pollution to the environment and long service life.Therefore,the super capacitor has a strong application value.The performance of supercapacitors mainly depends on the electrode material requirements.In recent years,metal oxides have become a research hot spot in supercapacitors.Therefore,the preparation and electrochemical properties of manganese dioxide（MnO₂）and vanadium pentoxide（V₂O₅）electrode materials were studied in this paper.The main content of this article is divided into the following aspects:（1）Introduction of supercapacitorsFirst,this paper made a detailed introduction of supercapacitors,which introduced the development history and classification of supercapacitor and made a detailed introduction of the electrode material and electrolyte of supercapacitor.（2）Synthesis and Characterization of Nanocomposite Manganese Dioxide/Hollow Mesoporous SilicaThe nanocomposite supercapacitor electrode material was prepared by the simple chemical synthesis of MnO₂ on the surface of hollow silica.The composition,structure and morphology of the electrode materials were characterized by TEM,XRD,FTIR and BET.Characterization and analysis showed that MnO₂ whiskers were synthesized in situ on the surface of hollow mesoporous silica.Electrochemical characterization of electrode materials and supercapacitor model showed that the manganese dioxide/hollow mesoporous silica nanocomposite electrode materials had higher specific power,power density and energy density.（3）Preparation and Characterization of MXene Supported V₂O₅ with Different Morphologies Electrode MaterialsV₂O₅/MXene nanocomposites were synthesized by simple hydrothermal method and calcination method to be used as supercapacitor electrode materials.The electrode materials were characterized by scanning electron microscopy（SEM）,X-ray energy dispersive spectroscopy（EDS）,Raman spectroscopy and FTIR.The results showed that the electrode material prepared by loading V₂O₅ microspheres on MXene The best chemical performance.