Ternary mixed nickel cobalt iron oxide nanorods as a high-performance asymmetric supercapacitor electrode

By utilizing a facile microwave process, ternary nickel cobalt iron oxide (NiCoFeO4) nanorods were synthesized. A comprehensive investigation of morphological, structural and surface chemistry of the nanorods has been carried out. The electrochemical investigation of NiCoFeO4 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 NiCoFeO4 nanorods displays a high-power density of 10 kW/kg, energy density of 9.8 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. (C) 2019 Elsevier Ltd. All rights reserved.