Facilely synthesized Fe_2O_3-graphene nanocomposite as novel electrode materials for supercapacitors with high performance

摘要

Fe_2O_3-graphene nanocomposite with high capacitive properties had been prepared friendly and facilely by hydrothermal method in one-step. The morphology and structure of the obtained material were examined by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) and transmission electron micro scope (TEM) techniques. It was revealed by TEM images that Fe_2O_3 nanoparticles grow well on the sur face of graphene and the formation of Fe_2O_3 nanoparticles hinders the aggregation of graphene (reduced graphene oxide, namely, RGO). Electrochemical properties of the synthesized materials were character ized by serials of electrochemical measurements in 1 M Na_2SO_4 electrolyte. Fe_2O_3-graphene nanocom posite electrode show higher specific capacitance than graphene, indicating an accelerative effect of Fe_2O_3 and graphene on improving the electrochemical performance of the electrode. The specific capac itance of Fe_2O_3-graphene nanocomposite is 226 F/g at a current density of 1 A/g. These attractive results indicate it is possible to seek and develop the promising, environmentally benign and commercial elec trodes material based on Fe_2O_3 and graphene.