The Preparation And Characterization Of Graphene Ternary Composites, Carbon Composite Material

Graphene is a new material with high specific surface area and excellent electrical properties, but it is difficult to disperse, easy agglomeration and stacking. Through its precursor graphene oxide (GO) or to prepare related composites may prevent their agglomeration or dispersion. MnO2is generally considered to be the most promising transition metal oxide for the next generation of supercapacitors because of its ideal capacitor performances, good cycle stability, low cost and environmental friendliness. However, the poor electrical conductivity and densely packed structure limit its application in the development of high-performance supercapacitors.Researchers have been more concerned about the preparation of grapheme binary composite materials with other single material, and the research on ternary composites based on graphene, MnO2and PPy were not sufficient. So, we try to overcome the shortcomings of a single material by preparing ternary composites. We try to take advantage of polypyrrole (PPy), polyaniline (PANI) and graphene, manganese dioxide to construct the ternary composites. In addition, we attempted using silicon dioxide (SiO2) as the template spheres to prepare hollow carbon (C), and then prepare a hollow carbon and polypyrrole composites.First, Graphene oxide (GO) was served as the substrate, the upper surface was covered by the in-situ polymerization of polyaniline (PANI), then nano-manganese dioxide (MnO2) was uniformly distributed on the surface of polyaniline (PANI), Then again, polyaniline formed by the in situ of polymerization was uniformly distributed on the surface of manganese dioxide, finally, we obtain the Polyaniline-wrapped MnO2nanorods intercalating graphene Oxide Sheets composite. Electrochemical tests showed that the capacitance can up to405F/g, and it has excellent cycle characteristics, after5000cycles, the capacitor can still achieve97%of the original capacitance.We first prepared the GO/MnO2binary compound materials and the GO/PPy materials, Then we use the two materials prepared the RGO/MnO2/PPy ternary composites under ultrasonic dispersion conditions. The result indicates that the nanocomposites were prepared successfully with excellent specific capacitance and good stability, the maximum specific capacitance can reach up400F/g, over91%of the initial capacitance was retained after repeating the cyclic voltammetry test for5000cycles. Finally, we use the silicon dioxide (SiO2) as the template spheres to prepare hollow carbon (C), through the in situ polymerization and we obtain the C-PPy composite materials.we test its electrochemical pro perties, the highest specific capacitance can up to205F/g.We analyzed the composition of the composites throughFourier transform infrared spectrometer (FT-IR), X-ray diffraction (XRD), Raman spectroscopy (Raman), and through the thermal gravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS) we analyzed itselement type and content, Then we analyzed the structure of the composite through the field-emission gun scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM).In summary, we have successfully prepared various types of composite with good cycle characteristics and high specific capacitance. And we explore different methods of preparing a composite material, which provide a relevant basisfor the subsequent build of ternary composite materials. These composites can be applied in the storage areas in future.