Graphene/conductive Polymer Composites Performance Study Of Supercapacitor

In recent years,super capacitor has been greatly favored by many scholars with its high capacitance,high power density,high energy density,high charge discharge efficiency and long cycle life.Scholars have found more and more electrode materials.And supercapacitors,compared to conventional batteries,make outstanding contributions to environmental protection.Conductive polyaniline with good chemical stability,low cost of raw materials,easy processing and its excellent advantages such as rapid de doping is researched in super capacitor material.TiO2 has large surface area which deteramines its strong charge transfer ability and energy storage capacity.Graphene is undoubtedly the leader in carbon-based materials,its high specific surface area,high conductivity is required for super capacitors.In this paper,we intend to use the in-situ polymerization method to prepare conductive polyaniline and conductive polyaniline doping titanium dioxide and conductive polyaniline and titanium dioxide doped graphene composites.The physical properties of the materials were investigated by Raman spectroscopy and X-ray diffraction,and the electrochemical performance was investigated by constant current charge discharge test,AC impedance test and cycle life test.The results show that compared with polyaniline,the composite of titanium dioxide and polyaniline show better electrochemical performance.Compared with polyaniline two-element composite,polyaniline,graphene and titania three-element composite show better electrochemical performance.On the one hand,growth of polyaniline and TiO2 on the graphene surface,increasing the graphene layer spacing,improve the graphene surface area;on the other hand,graphene for polyaniline and titanium dioxide to provide growth template,uniform growth,avoid agglomeration,enhance the overall electrochemical properties of the material.The specific capacity of the conductive polyaniline was 84.3 F·g-1,which was lower than that of the polyaniline doped with titanium dioxide at the current density of 0.5A-g-1.Under the same conditions,the capacitive properties of graphene ternary composites are best,the specific capacity of 244.2 F·g-1,200 times after the storage capacity of 80.164%.The composites exhibit good electrochemical properties.