材料期刊网

Supercapacitor is a new type of energy-storage device,and has been attracted widely attentions.As a two dimensional (2D) nanomaterials,graphene is considered to be a promising material of supercapacitor because of its excellent properties involving high electrical conductivity and large surface area.In this paper,the large-scale graphene is successfully fabricated via environmental-friendly electrochemical exfoliation of graphite,and then,the three dimensional (3D) graphene foam is prepared by using nickel foam as template and FeCl3/HCl solution as etchant.Compared with the regular 2D graphene paper,the 3D graphene foam electrode shows better electrochemical performance,and exhibits the largest specific capacitance of approximately 128 F/g at the current density of 1 A/g in 6 M KOH electrolyte.It is expected that the 3D graphene foam will have a potential application in the supercapacitors.