Preparation And Electrochemical Properties Of PANI/rGO As Supercapacitor Cathode Materials

As a new type of green energy storage device,the supercapacitors have better performance than traditional energy storage methods such as ordinary batteries.Because of its high specific capacitance,high power density,fast charge and discharge speed,high cycle life,wide temperature and pollution-free,supercapacitors have strong application value and development prospects.However,the performance of supercapacitors depend to the requirements for electrode materials.In recent years,polyaniline and graphene are compounded as a tantalum capacitor electrode material.Because of its large specific capacitance and simple fabrication method,it has become a research hotspot in supercapacitor electrode materials.Based on the microscopic morphology and structure of the material,graphene and polyaniline were compounded by interfacial polymerization method.The effects of different polymerization time and acid concentration on the microstructure and electrochemical properties of the composites were investigated.The polyaniline-graphene composite with high specific capacity and high rate performance was designed and prepared,and the relationship between the microstructure and electrochemical properties of the electrode material was analyzed in detail.?1?Firstly,the supercapacitor is introduced in detail,mainly including the development history and classification of supercapacitors.The electrode materials of supercapacitors-polyaniline,graphene and their composite materials,and their preparation methods are described in detail.?2?The polyaniline/graphene supercapacitor electrode materials were prepared by interfacial polymerization method.The effects of different reaction time on the morphology and electrochemical properties of graphene/polyaniline composites were discussed in detail.The microstructure,morphology and electrochemical properties of the composites were analyzed by X-ray diffraction,Fourier transform,scanning electron microscopy,cyclic voltammetry,constant current charge and discharge and AC impedance to find the optimal reaction time.?3?In order to obtain polyaniline with different morphology,we controlled the concentration of hydrochloric acid in the interfacial polymerization method.The concentrations of hydrochloric acid were 0.2 mol L^-1,0.9 mol L^-1,1.4 mol L^-1 and 2.0mol L^-1,respectively.The morphology of polyaniline was characterized by XRD,FT-IR and SEM.The electrochemical properties of polyaniline were tested by CV,CD and EIS.?4?Graphene/polyaniline composites were prepared by chemical oxidation in situ polymerization.In the same experiment,the concentration of different hydrochloric acid was taken to control the morphology of polyaniline to control the morphology and electrochemical properties of the composite.Finally,the specific capacitance,specific capacitance retention and the experimental results were compared and analysis.