Preparation And Electrochemical Performance Of Polyaniline/Graphene-like Structure Inorganic Composites

As an electrode material of a super capacitor,the conductive polymer has become an important research field in recent years because of its unique structure,large theoretical capacitance,good electrical conductivity,environmental stability,and low cost.The conductive polymers mainly include polypyrrole,polyaniline,polythiophene,and some polymer derivatives.The specific capacitance of the conductive polymer is high,but during the charge-discharge process,the conductive polymer causes volume contraction and expansion due to ion-insertion,which largely degrades the reversibility and stability of the reaction and results in poor cycle performance and becomes electropolymerization.The material alone acts as an obstacle to the supercapacitor electrode material.In the case of conducting polymer/inorganic nanocomposite materials doped with inorganic substances as a filler in a polymer as electrochemical capacitor materials,not only the capacitance characteristics of the respective components are accumulated,but also the inorganic components may serve as skeleton support,increasing.The specific surface area of the material and the synergy between the components are also one of the factors that enhance the capacitive properties of the composite.Therefore,the preparation of composites based on conductive polymers and their electrochemical performance is an important direction for the development of supercapacitor electrode materials.In many polymers,PANI synthesized from inexpensive aniline is simple in synthesis,has good chemical stability,high conductivity,and has tantalum capacitor energy storage characteristics,but PANI has poor cycling stability and temperature dependence.Stronger and other shortcomings.Therefore,this research group has conducted in-depth research on polyaniline/graphene-inorganic binary or even ternary composites.（1）CDs/PANI composites successfully prepared by in-situ polymerization using novel zero-dimensional carbon family members-carbon dots（CDs）as raw materials.SEM and TEM results show that PANI nanofibers and CDs are intertwined with each other.The results of electrochemical studies show that the CDs/PANI composite electrode materials have better conductivity and capacitance characteristics than pure PANI.When the current density is 2A/g in 1 mol/L H₂SO₄ electrolyte,the specific capacitance of 6%CDs/PANI composite reaches an average of 1070F/g during 1000 cycles,which is much higher than that of pure polyaniline.The specific capacitance is 460F/g.It shows that the incorporation of CDs helps to improve the electrochemical capacitance of PANI.（2）Firstly,MoS₂ with good crystallinity was prepared by high-temperature solid-phase sulfiding method.PANI/MoS₂ binary composites with different molar ratios of PANI and MoS₂ were successfully prepared by in-situ polymerization.Electrochemical studies show that the PANI/MoS₂ binary composite electrode material with a molar ratio of PANI to MoS₂ of 1:0.1 has better capacitance characteristics than pure PANI.At different current densities,the specific capacitance of the binary complex is significantly higher than that of pure polyaniline.the specific capacitance of binary composite with PANI:MoS₂=1:0.1 can reach 955.8 F/g at the current densities of 1A/g.It isdouble as high as 385.7 F/g of PANI at same current density.It shows that the proper amount of MoS₂ incorporation helps to improve the electrochemical capacitance characteristics of the PANI electrode material.（3）Firstly,WS₂ with good crystallinity was prepared by high-temperature solid-phase sulfiding method,and CDs/PANI/WS₂ ternary composites were successfully prepared.The ternary composite electrode material has better c capacitance than pure PANI.The specific capacitance of the ternary complex is significantly higher than that of the pure polyaniline at different current densities.The specific capacitance of the CDs/PANI/WS₂ ternary composite can reach 1108.7 F/g at1A/g.PANI at current density is twice as high as 392.7 F/g.