Preparation of NF/rGO/Co3O4/NiO Electrode and Its Application in Supercapacitor

• Key Words:Supercapacitor; Electrochemical deposition; Reduced graphene oxide(rGO); Metallic oxide
• Abstract:The electrochemical deposition method was used to prepare NF/rGO/Co3O4 and NF/rGO/Co3O4/ NiO electrodes(NF = nickel foam; rGO = reduced graphene oxide). Here, with NF as a current collector, rGO, Co3O4 and NiO were grown on NF directly without any binder under specific conditions including optimized potential, time and concentration. NF/rGO/Co3O4 and NF/rGO/Co3O4 /NiO electrodes were used as the electrode of supercapacitor, and three. electrode system was employed in cyclic voltammetry, galvanostatic charge. discharge and electrochemical impe. dance spectroscopy characterization of the electrodes. The results showed that the capacitance of NF/rGO/Co3O4 /NiO electrode was 1188.. 6 F/g at 2 A/g; its rate capability was 75.. 7% when the current density varied from 2 A/g to 12 A/g; and its cycling stability was 80.. 5% after 2000 times. Compared with NF/rGO/Co3O4, the supercapacitor performance of NF/rGO/Co3O4 /NiO electrode improved a lot, which can be attributed to the synergistic effect of Co3O4 and NiO. What's more, rGO could enhance the electroconductivity of electrodes to a large extent.
• Volume:38
• Issue:11
• Translation or Not:no