Abstract:
Polyoxometalates and transition metal oxides have attracted great attention due to their reversible chemical redox reaction and long life stability. Inexorable agglomeration and shrinkage/extension of polyoxometalates particles in the nano regime have a remarkable effect on electrochemical properties. we have synthesized iron nickel cobalt ternary oxide (FNCO) nanowires by a simple, facile and cost-effective method of the hydrothermal route and its properties were studied as an electrode material for supercapacitor in detail. For comparative study nanowires of nickel cobalt oxide (NCO), iron cobalt oxide (FCO) and cobalt oxide (CO) were synthesized by the hydrothermal routs. The synthesized FNCO overcomes the shortcomings in electrochemical energy storage devices by exhibiting the higher specific capacitance of 2197 Fg-1, higher energy density 109 Whkg-1 at a current density of 1 Ag-1. FNCO has shown a charge and discharge stability more than 93 % after twenty thousand cycles. Moreover, FNCO/graphene asymmetric device was fabricated by FNCO as positive electrode and graphene as a negative electrode. Asymmetric device showed a high energy density 47 Whkg-1, the power density of 375 Wkg-1 and capacitance of 151 Fg-1 ate current density of 0.5Ag-1. Further device showed the capacitance retention of 90% over 2440 cycles. These tremendous electrochemical performances endorse that the FNCO nanowire electrodes can be proved a highly efficient candidate for advanced supercapacitor electrodes.
