Hierarchical porous flower-like nickel cobaltite nanosheets as a binder-less electrode for supercapacitor application with ultra-high capacitance

[Display omitted] •Binder-less nickel cobaltite is synthesized using facile hydrothermal method using excess amount of complexing agent.•The highly porous nature is observed on the flower-like nickel cobaltite by FE-SEM analysis.•The prepared binder-less electrode shows ultrahigh specific capacitance of 2100F/g at 5mV/s.•About 88.5% initial capacitance is retained even after 2000 cycles. Herein, we present a large-scale growth of porous hierarchical structure of three-dimensional (3D) flower-shaped nickel cobaltite (PFNC) nanosheets on Ni foam current collector with hardy adhesion as high-performance electrode for supercapacitors via facile hydrothermal method and then post annealing treatment. The availability of porous architecture increases the electroactive cites and facilitates speedy ion and electron conduction during electrochemical reactions. The prepared material shows an excellent specific capacitance of 2100Fg−1 (4.24Fcm−2) at 5mVs−1 scan rate by cyclic voltammetry analysis. Overall results divulge that the binder-less PFNC electrode will be a promising electrode material for supercapacitors.