Facile Hydrothermal Synthesis and Characterization of Mesoporous Iron-ZincCobalt Ternary Oxide Nanostructures for Supercapacitor Electrode material

Abstract

Transition metal oxides have been researched and explored for the last few decades for various energy storage systems for their extraordinary electrochemical properties. Mesoporous nanostructured Iron-Zinc-Cobalt oxide has been established as an excellent electrode material due to the synergic enhancement effect of cobalt cations replacement with zinc and iron. Iron-Zinc-Cobalt oxide (FZCO) nanostructures were synthesized by a hydrothermal approach followed by furnace annealing. For a comparative study, a series of samples have been synthesized to construct an efficient and optimized electrode by varying the molar concentration of Cobalt nitrate in the nanostructures. Electrochemical analysis affirmed the developed mesoporous FZCO nanowires for supercapacitors. The synthesized FZCO shows a higher specific capacitance of 2442.5 Fg-1 and a higher energy density of 84.81 Whkg-1 at a current density of 1 Ag-1 and 94.25 % specific capacitance was retained up to 10000 GCD cycles. Moreover, an asymmetric supercapacitor (ASC) device is developed by employing FZCO as a positive electrode and MWCNTs as a negative electrode which exhibits an excellent electrochemical performance by having a high energy density of 47.175 Whkg-1 and good capacitance retention of 94.17% over 10000 cycles.