Research On The Preparation And Electrochemical Properties Of Graphene/Conductive Polymer Nanocomposites Materials

Graphene, as the electrode material of supercapacitors, has high specific surface area,good mechanical properties and excellent electrical properties which make it have a wide rangeof applications in various fields. More importantly, graphene-based conductive polymercomposites can produce good synergy, so get the attention of more and more scientists. Iprepared graphene by hydrothermal reduction and grapheme/polyaniline (pyrrole) compositematerials by electrochemical deposition method in this thesis. It was a green, controllable andnovel method. The morphology, structure, and electrochemical properties of electrodes werecharacterized and tested. The details are shown as follows:（1）The oxide graphite was prepared by Hummers method, and then treated with freezedrying method. The obtainted oxide graphite had loose, porous and spongy appearance. Theoxide graphite was hydrothermal reduced to graphene. The structure and morphology ofgraphene were characterized using X-ray diffraction (XRD) and scanning electron microscope(SEM). The electrochemical properties were characterized via cyclic voltammetry,galvanostatic charge-discharge and electrochemical impedance spectroscopy. The resultsshowed that the graphene have good electrochemical properties. The specific capacitance was103F/g at a current density of1A/g.（2）The graphene/polyaniline composite materials were obtained by electrochemicaldeposition method. The morphology of composite materials were characterized by SEM. Theelectrochemical properties were characterized via cyclic voltammetry, galvanostaticcharge-discharge and electrochemical impedance spectroscopy. The results revealed that thecomposite materials have super electrochemical properties when aniline concentration was0.4mol/L and the electrodeposition time was20min. The specific capacitance was425F/g at acurrent density of1A/g. The cyclic voltammetry curve demonstrated that the compositematerials emerge good pseudo-capacitance properties.（3）The graphene/polypyrrole composite materials were obtained by electrochemicaldeposition method. The morphology of composite materials were characterized by SEM. Theelectrochemical properties were characterized via cyclic voltammetry, galvanostaticcharge-discharge and electrochemical impedance spectroscopy. The results revealed that the composite materials have excellent electrochemical properties when pyrrole concentration was0.2mol/L and electrodeposition time was22.5min. The specific capacitance was338F/g at acurrent density of1A/g.