Preparation of NF/rGO/Co<inf>3</inf>O<inf>4</inf>/NiO Electrode and Its Application in Supercapacitor

• Key Words:Electrochemical electrodes;Cyclic voltammetry - Deposition - Electric discharges - Electrodeposition - Electrodes - Graphene - Metallic compounds - Metals - Nickel compounds - Reduction - Supercapacitor;Electrochemical deposition - Electrochemical deposition methods - Electroconductivity - Galvanostatic charge discharges - Metallic oxides - Reduced graphene oxides - Reduced graphene oxides (RGO) - Three electrode-system
• Abstract:The electrochemical deposition method was used to prepare NF/rGO/Co<inf>3</inf>O<inf>4</inf>and NF/rGO/Co<inf>3</inf>O<inf>4</inf>/NiO electrodes(NF=nickel foam; rGO=reduced graphene oxide). Here, with NF as a current collector, rGO, Co<inf>3</inf>O<inf>4</inf>and NiO were grown on NF directly without any binder under specific conditions including optimized potential, time and concentration. NF/rGO/Co<inf>3</inf>O<inf>4</inf>and NF/rGO/Co<inf>3</inf>O<inf>4</inf>/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/Co<inf>3</inf>O<inf>4</inf>/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/Co<inf>3</inf>O<inf>4</inf>, the supercapacitor performance of NF/rGO/Co<inf>3</inf>O<inf>4</inf>/NiO electrode improved a lot, which can be attributed to the synergistic effect of Co<inf>3</inf>O<inf>4</inf>and NiO. What"s more, rGO could enhance the electroconductivity of electrodes to a large extent.<br/> &copy; 2017, Higher Education Press. All right reserved.
• Volume:38
• Issue:11
• Translation or Not:no