Hydrothermally Engineered Nickel Cobaltite on Nickel Foam Electrode for high efficiency Supercapacitor Applications

Binder-free Nickel Cobaltite (NiCo 2 O 4 ) nanosheet-like nanostructures assembled into flower-like microarchitectures were successfully grown on conducting nickel foam through a simple hydrothermal approach for supercapacitor applications. Structural and morphological analyses using X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) confirmed the formation of cubic spinel NiCo 2 O 2 with uniform nanosheets growth over the nickel foam substrate. Electrochemical investigations performed using cyclic voltammetry (CV), Galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS) demonstrated excellent capacitive performance of the fabricated electrode. The NiCo 2 O 2 /NF electrode exhibited a high specific capacitance of 1240 Fg -1 at a current density of 5 Ag -1 along with an excellent capacitance retention of 93% after 2000 charge. discharge cycles at 50 Ag -1 . The enhanced electrochemical performance is attributed to the unique nanosheets-like architecture and effective binder-free conductive network, making the fabricated electrode a promising candidate for high-performance supercapacitor applications.