Preparation And Electrochemical Investigation Of Graphene/Conductive Polymer Composites

Supercapacitor is a good clean energy storage device with high power density,fast charging and discharging speed,long cycle life,etc.It is a very good clean energy storage device.It is widely used in intelligent instruments,new energy vehicles,consumer electronic products and other fields.Graphene is a very good electrode material for supercapacitors because of its excellent electrical,thermal conductivity and flexibility.Conducting polymers such as polyaniline and polypyrrole also have good electrochemical activity.The graphene/conductive polymer composites prepared by the combination of the two materials usually have better electrochemical properties than single materials.In this paper,graphene oxide(GO)was prepared by improved Hummers method.Then,the graphene oxide was used as the matrix,and poloxamer 188(PEO-PPO-PEO)was used as the non-ionic surfactant,and graphene/polyaniline(mPANi)and graphene/polypyrrole(mPPy)composites were prepared by in-situ chemical polymerization.Using GO,aniline and ammonium persulfate as raw materials,Poloxamer 188 columnar micelles as template,polyaniline with columnar pores was self-assembled on the surface of graphene by in-situ chemical polymerization.Finally,graphene/polyaniline(mPANi)nanocomposites were prepared.The effect of acidity on the structure and properties of the composites was studied.The results show that the single layer structure of rGO can be clearly seen in the prepared mPANi/rGO composite,and the large-scale agglomeration of PANi does not appear.The specific surface area of the composite is large,and the acidity has a certain influence on the dispersion of the composite's rGO lamellar structure and the agglomeration of PANi.In 1 mol/L H₂SO₄electrolyte,the specific capacitance of the material reaches 470.8 f/g at 5 mV/s scanning rate.Then,GO,Pyrrole and ammonium persulfate were used as raw materials,Poloxamer 188micelles were used as templates,and Polypyrrole with columnar pores was self-assembled on the surface of graphene by in-situ chemical polymerization.Finally,Graphene/Pyrrole(mPPy)nanocomposites were prepared,and the effect of acidity on the structure and properties of the composites was studied.Then the mPPy/rGO composites without poloxamer 188 were prepared under the same conditions.After comparing their properties,it is found that the single layer structure of rGO can be clearly seen in the prepared mPPy/rGO composites.When the acidity is low,the agglomeration of PPy is less.With the increase of acidity,PPy gradually adsorbs on the surface of rGO,increasing the interlayer distance,but reducing the specific surface area of the materials,which affects the formation of PPy template.In 1 mol/L H₂SO₄electrolyte,the specific capacitance of the material reaches 326.2 F/g at 5 mV/s scanning rate.