Facile Synthesis of Mesoporous NiCo2O4 Nanosheets on Carbon Fibers Cloth as Advanced Electrodes for Asymmetric Supercapacitors.

The NiCo₂O₄ Nanosheets@Carbon fibers composites have been successfully synthesized by a facile co-electrodeposition process. The mesoporous NiCo₂O₄ nanosheets aligned vertically on the surface of carbon fibers and crosslinked with each other, producing loosely porous nanostructures. These hybrid composite electrodes exhibit high specific capacitance in a three-electrode cell. The asymmetric supercapacitor (NiCo₂O₄ Nanosheets@Carbon fibers//Graphene oxide) displayed a high specific capacitance of 91 F g^-1 and excellent cycling stability with a capacitance retention of 94.5% at 5 A g^-1 after 10,000 cycles. The device also achieved a notable energy density of 52 Wh kg^-1 coupled with a power density of 3.5 kW kg^-1 and a high power density of 7.1 kW kg^-1 with an energy density of 21 Wh kg^-1. This study shed light on the great potential of this asymmetric device as future supercapacitor.