Construction And Electrochemical Characteristics Of Multi-dimentional Carbon Materials

Supercapacitor has been widely used in various fields because of its largecapacity, high power density, long cycle life. Current focuses of research lie in thedevelopment of approaches to increase energy density and power density throughincreasing specific surface area, electricalconductivity and structural stability ofcapacitor materials.Graphene, a two-dimensional monolayer of sp2-bonded carbon atoms, hasattracted tremendous interest as the most promising type of energy storage devices inrecent years, due to its high electrical and thermal conductivities, excellentmechanical properties and extremely large specific surface area. However, a criticalissue encountered in this process is that rGO usually suffers from seriousagglomeration curl itself, dispersed in a solvent and restacking during utilization as anelectrode material. Therefore, doping in graphene sheets and forming compsiteelectrodes material are hot topics in current research.The goal of this paper is to studya variety of forms of carbon intercalation into graphene and the focus is to buildmulti-dimensional graphene nanocomposites in order to play synergism between themand obtain excellent electrochemical performance.In this paper, we used graphite oxide and a common carbohydrate as rawmaterial by ultrasonication-calcination method to prepare graphene/C nanocompositeas supercapacitor electrode material. It was showed that the amount and type ofcarbohydrate had a major impact on the product morphology, structure, therebyaffecting the electrochemical properties of the product. The specific capacitance ofC/graphene composite electrode in supercapacitors reached273F·g-1at the currentdensity of0.5A·g-1, When using glucose as the carbon source, the surface area of thenano composite reached414.8m2·g-1. When used as electrode material for thesupercapacitor, the as-prepared material showed high capacity and good cyclestability (the specific capacity is237F·g-1at the current density of1A·g-1over2000cycles), as well as a large current discharge capacity. The C60/graphene composite was constructed first with graphene oxide andLi-functionalized C60particles by a facile solution method. By selecting appropriateexperiment conditions for the glucose in alkaline conditions form a compositematerial. The specific capacitance of C60/graphene-based supercapacitors could reach135.36F·g-1at the current density of1A·g-1. In addition, the C60/graphene-basedsupercapacitors exhibited good electrical double layer capacitor and excellentelectrochemical stability.In this paper, SWCNT/graphene composite was synthesized by a facile solutionmethod via a tube furnace-assisted reduction of graphene oxide (RGO) insingle-walled carbon nanotubes (SWCNTs) suspension. The synthesized sampleswere characterized with structural characterization analysis. It was revealed that theSWCNT attached onto the surface of graphene. The specific capacitance ofSWCNT/graphene composite electrode in supercapacitors reached163.8F·g-1at thecurrent density of1A·g-1, as well as a remarkable retention rate of90.56%after1500charge/discharge cycles. The composite showed excellent electrochemical storagecapacity.