Abstract

Incorporation of reduced graphene oxide (rGO) in Co 3O 4 matrix is systematically investigated through a chemical route for supercapacitors. The α-Co(OH) 2 supported by graphene oxide is first fabricated by a chemical precipitation approach. Thermal decompositions of these precursors at the given temperature (150 °C) lead to rGO/Co 3O 4 composites. Measurement results show that the morphology and electrochemical activity of the rGO/Co 3O 4 composites are influenced significantly by the mass ratios of rGO to Co 3O 4. When used as electrode materials in supercapacitors, the composite with mass ratio of 0.22:1 (rGO:Co 3O 4) achieves the specific capacitance as high as 291 F g −1 at 1 A g −1 in the potential range of −0.4 to 0.55 V, as compared with each individual counterpart (56 and 161 F g −1 for rGO and Co 3O 4, respectively). In addition, the excellent rate capability and well cycling ability are observed in the composite electrodes. The enhanced electrochemical performance is indicative of a positive synergistic effect between rGO and Co 3O 4. These results suggest the importance and great potential of graphene based composites in the development of high-performance energy-storage systems.

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