A Study Of Preparation Of 3D-graphene And Its Electrical Properties

Three dimensional graphene, which is three-dimensional structure, composed of two-dimensional graphene, has high conductivity and high thermal conductivity rate, etc. At the same time, this kind of material has good macroscopic mechanical properties and special carbon honeycomb structure, can be widely used as thermal conductive material, conductive material and active electrode materials of supercapacitor.Now the preparations of three-dimensional graphene are mainly hydrothermal self assembly method, chemical reduction of self assembling method and interfacial self-assembly method, reaction temperature is mostly more than 100 ℃,time wastes, hydrazine hydrate and hydrogen iodide, which is toxic or difficult to operate. The mechanical properties of the product is poor. So it is an urgent need to find a simple and fast method for the preparation of the green, especially for the high conductivity and mechanical strength of the three-dimensional graphene. In this paper, the preparation and electrical properties of three-dimensional graphene were studied.（1） Investigation and research on the present situation of the preparation of three-dimensional graphene;（2） The method of hydrothermal reduction of graphene oxide and Na₂S reduction were used to prepare the three-dimensional graphene. The morphology and properties of the materials obtained by the two methods were characterized. The results show that the performance of Na₂S reduced graphene is better, which conductivity is higher, and the electrical properties（cyclic voltammetry and constant current charge discharge） is better;（3）Study of three dimensional graphene/MnO₂ composite electrode materials of preparation method. According to the previous research, we improved the experimental method, method for preparing "one-step" and "two-step", and completed the characterization and morphology of composite materials. The results show that the "one step" method is more simple, and the mechanical properties of the material is better, can withstand the pressure of 10 KPa;（4） The three-dimensional graphene was assembled into a supercapacitor, and the electrical properties were studied.