By utilizing a facile microwave process, ternary nickel cobalt iron oxide (NiCoFeO 4 ) nanorods were synthesized. A comprehensive investigation of morphological, structural and surface chemistry of the nanorods have been carried out. The electrochemical investigation of NiCoFeO 4 nanorods shows superior supercapacitive characteristics achieving a maximum specific capacitance (C sp ) of 1263 F/g at a current density of 1 A/g and cyclic stability retaining 97.2 % of capacitance after 2000 cycles. Asymmetric supercapacitor based on NiCoFeO 4 nanorods displays a high-power density of 10 kW/kg, energy density of 32 W h/ kg, coulombic efficiency of 95.5% and capacitance retention of 94% after 4000 cycles. The asymmetric supercapacitor is featuring an outstanding potential for practical supercapacitors due to high surface area nanorod morphology and mixed transition metal oxide synergetic effect.

Metal oxides with tailored nanomorphology represent a powerful tool to improve the electrocatalytic activity. Herein NiCo2O4 nanoflowers were synthesized via facile microwave method. NiCo2O4 nanoflowers were characterized by scanning and transmission electron microscopy, X‐ray diffraction (XRD), Raman spectroscopy, N2 gas adsorption/desorption, and X‐ray photoelectron spectroscopy (XPS). Through comparing NiCo2O4 nanoparticle vs nanoflowers morphology, NiCo2O4 nanoflowers have a superior mass and specific electroactivity towards oxygen evolution reaction (OER) by achieving a current density of 10 mA/cm2 at an overpotential of only 280 mV in 1M KOH electrolyte. Moreover, NiCo2O4 nanoflowers display superior performance for methanol electrooxidation in fuel cells by achieving 200 A/g and recovers 92.3 % of the original activity through the addition of new (1M KOH + 0.5M methanol) electrolyte after 500 cycles.