Synthesis And Study Of PPy/Graphene Based Nanocomposite For Supercapacitors

In this experiment, graphene was used as a basic construction, which has high conductivity and large surface area,to design SDBS intercalated-reduced graphene oxide/polypyrrole nanocomposites via in situ polymerization method. Then the ternary organic–inorganic complex of polypyrrole/manganese tetroxide/graphene(PPy/Mn3O4/graphene) nanocomposite was first prepared by in situ chemical oxidation polymerization of pyrrole in the host of inorganic matrix of Mn3O4 and graphene, using complex of methyl orange(MO)/Fe Cl3 was used as a reactive self-degraded soft-template. The morphology and molecular structure of the composite were characterized by physical and chemical means, and the synthesized materials for electrical properties were studied as supercapacitor electrodes.First of all, PPy(polypyrrole)/SDBS(sodium dodecyl benzenesulfonate) intercalated reduced graphene oxide(r GO) nanocomposites(PPy/GSR) were prepared via in situ oxidative polymerization of pyrrole on the SDBS interposed graphene. FE-SEM(field emission scanning microscopy), TEM(transmitting electron microscopy), UV–vis(ultraviolet and visible) absorption spectroscopy, FT-IR(Fourier transform infrared) spectroscopy, XRD(X-ray diffraction) analyzer and TGA(thermogravimetric analysis) instrument were used to characterize the morphology and structure of the samples. The results showed the disordered GSR(SDBS organo modified-r GO) disappeared and r GO existed in the form of individual graphene sheet or stacked layers in PPy matrix. The r GO serves as a support material for nano-sized PPy particles. In addition, CV(cyclic voltammetry) and EIS(electrochemical impedance spectroscopy) techniques were used to measure the electrochemical properties with a three-electrode cell measurement, and GCD(galvanostatic charge-discharge) with a two-electrode cell measurement. The specific capacitance of the PPy/GSR nanocomposite achieved 277 F/g for the PPy/GSR 9:1 sample at current density of 0.1 A/g in 1 M Na2SO4.Secondly, ternary organic–inorganic complex of polypyrrole/manganese tetroxide/graphene(PPy/Mn3O4/graphene) nanocomposite was prepared by in situ chemical oxidation polymerization of pyrrole in the host of inorganic matrix of Mn3O4 and graphene, using complex of methyl orange(MO)/Fe Cl3 as a reactive self-degraded soft-template. The morphology and molecular structure of the composite were characterized by scanning electron microscope(SEM), transmission electron microscope(TEM), Fourier transform infrared transmission spectra(FT-IR), X-ray diffraction analysis(XRD). It shows that PPy nanotubes and Mn3O4 nanoparticles distribute well in graphene. Part of the Mn3O4 particles adhere to the outer and inside wall of polypyrrole. There is no visible agglomeration and the composites covered with graphene uniformly. The electrochemical performance of PPy/Mn3O4/graphene electrode was evaluated by cyclic voltammetry(CV), galvanostatic charge-discharge(GCD) and electrochemical impedance spectroscopy(EIS). The PPy/GM-3 nanocomposite exhibited a specific capacitance of 288 F/g at current density of 0.1 A/g in 1M Na2SO4. The results showed that the PPy/Mn3O4/graphene nanocomposite could be used as electrode material for high performance super capacitors.