Synthesis And Electrochemical Properties Of Nitrogen-doped Graphene/ Polyaniline/Sulphide Nanocomposites

In this paper, all methods which used in the erpermients are hydrothermal method and in-situ chemical oxidative polymerization. Compounding nitro-doped graphene (GN) sheets with Copper Sulphide (CuS) and Copper and Cobalt Sulfide respectively, through hydrothermal method; then cover polyaniline(PANI) on the Copper Sulphide nanospheres by in-situ chemical oxidative polymerization. The structure and morphology of the as-prepared nanocomposites were characterized by field-emission scanning electron microscopy (FESEM),transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS),X-ray diffraction (XRD) and Raman spectra. In order to explore the electrochemical performance of the nanocomposites, CV, galvanostatic charge/discharge measurements and impedance spectra were tested by electrochemical workstation.The main experiments including three sections:1. GN/CuS composites were synthesized successfully via hydrothermal method and used for electrode materials for electrochemical supercapacitors effectively. The nanosheets of GN not only provide large surface for the form of CuS nanospheres but also contribute high conductivity which exhibits brilliant supercapacitors performance with CuS nanospheres.2. First, CuS nanospheres were synthesized successfully via hydrothermal method, then cover polyaniline (PANI) on the Copper Sulphide nanospheres by in-situ chemical oxidative polymerization. Owing to this special core-shell structure, the composites exhibit high capacity and stability during electrochemical measurements.3. Basic on the study of GN/CuS composites, we try to synthesize GN/CuCo2S4 which used Cu(NO3)2·3H2O and Co(NO3)2·3H2O as precursor materials,which present good specific electrochemical performance during electrochemical measurements.