Marigold micro-flower like NiCo(2)O(4) grown on flexible stainless-steel mesh as an electrode for supercapacitors

Nanostructured NiCo(2)O(4) is a promising material for energy storage systems. Herein, we report the binder-free deposition of porous marigold micro-flower like NiCo(2)O(4) (PNCO) on the flexible stainless-steel mesh (FSSM) as (PNCO@FSSM) electrode by simple chemical bath deposition. The SEM and EDS analysis revealed the marigold micro-flowers like morphology of NiCo(2)O(4) and its elemental composition. The porous nature of the electrode is supported by the BET surface area (100.47 m(2) g(−1)) and BJH pore size diameter (∼1.8 nm) analysis. This PNCO@FSSM electrode demonstrated a specific capacitance of 530 F g(−1) at a high current density of 6 mA cm(−2) and revealed 90.5% retention of specific capacitance after 3000 cycles. The asymmetric supercapacitor device NiCo(2)O(4)//rGO within a voltage window of 1.4 V delivered a maximum energy density of 41.66 W h kg(−1) at a power density of 3000 W kg(−1). The cyclic stability study of this device revealed 73.33% capacitance retention after 2000 cycles. These results indicate that the porous NiCo(2)O(4) micro-flowers electrode is a promising functional material for the energy storage device.