▎ 摘　　要

Electrode materials with high conductivity and excellent redox characteristics are vital to supercapacitors in electrochemical energy storage. Herein, a graphene/Co3O4/Co(OH)(2)/Ni electrode synthesized hydrothermally has high specific capacitance and the morphology and structure of the graphene/Co3O4/Co(OH)(2)/Ni electrodes are characterized systematically. The three electrode charge-discharge test exhibits an excellent specific capacitance of 3216Fg(-1) at 5 Ag-1. The two electrode charge-discharge capacitance decreases from an initial value of 195 to 140 Fg(-1) after 5000cycles showing capacitance retention of 71.1%. A test device is fabricated with (OH)(2)/Co3O4/graphene/Ni as the positive electrode and carbon/nickel foam as the negative electrode. After charging for 15s, two such devices in series can efficiently power five 5-mm-diameter light-emitting diodes (LEDs) and the excellent electrochemical performance reveals large potential in next-generation high-performance supercapacitors.