Electrode materials are key factors for supercapacitors to endow them with excellent electrochemical properties. Here, a novel hybrid structure of a CoSe/Co3O4-CNTs binder free composite electrode on nickel foam was prepared via a facile flame method, followed by an electrodeposition process. Benefitting from the synergetic effects of the multicomponent (with low resistances of 1.542 Ω cm2 and a moderate mesoporous size of 3.12 nm) and the enlarged specific surface area of the composite material (77.4 m2 g-1), the CoSe/Co3O4-CNTs composite electrode delivers a high specific capacitance of 2906 F g-1 at 5 mV s-1 with an excellent rate stability. The fabricated CoSe/Co3O4-CNTs/NF//AC ASC exhibits a high energy density of 43.4 Wh kg-1 at 0.8 kW kg-1 and a long cycle life (92.7% capacitance retention after 10,000 cycles).
Keywords: CoSe/Co3O4-CNTs composite electrode; asymmetric supercapacitor; flame method; long cycle life; ultra-high specific capacitance.