Preparation And Performance Of Conductive Material Modified Mn₃O₄ Composite Electrode

Supercapacitors,as a kind of green energy storage device,have attracted lots of attention for its high power density,environmental friendship,safety,easy maintenance and wide temperature range.Manganese metal oxides are the promising supercapacitor electrode material because of their high theoretical capacity,low cost and environment-friendly.Mn₃O₄ has paid abundant attention due to nature abundance,stability and controllable microstructure.However,the poor conductivity of Mn₃O₄ seriously restricts its further development.Therefore,it is very important to improve the conductivity and stability of the Mn₃O₄.In this paper,we synthesized high conductivity polyaniline hydrogel with three-dimensional porous network structure by TPPS as crosslinking agent and doping agent.Then,a three-dimensional porous Mn₃O₄/PANi composite hydrogel is polymerized in-situ,with nanorods uniformly coated by polyaniline.The results of electrochemical performance tests show that the composite electrode exhibits a specific capacity of 422F g^-1 at a current density of 0.5 A g^-1.After 2000 cycles,the capacity loss is 11%.So the composite exhibits high specific capacity and good stability.It shows that the conductivity and stability of the material are guaranteed by the excellent electron ion transport properties of the conductive polymer and the structure of the reinforced concrete.On this basis,two-dimensional intercalate-embedded Mn₃O₄/RGO composites were prepared by ultrasonic and electrostatic adsorption.This special structure as well as the excellent electrical conductivity and mechanical properties of graphene can effectively improve the conductivity of Mn₃O₄ and prevent the agglomeration of reduced graphene oxide.The electrochemical performance tests show that the specific capacity of the two-dimensional intercalate-embedded Mn₃O₄/RGO composites reached 531 F g^-1 at a current density of 0.5 A g^-1.After 5000 cycles,the composite electrode has a capacity loss of 8%,which shows a good stability.In addition,the composite also has admirable processing performance,which can be made into microsupercapacitors by 3D printing and screen printing.