Facile Hydrothermal Synthesis of Hierarchically Mesoporous Nickel-Cobalt Selenide (NiCoSe) Nanowires for High Performance Supercapacitors

Abstract

Hierarchical mesoporous Nano-wires nickel-cobalt oxide at nickel cobalt selenide (core/ shell) has been established as a promising electrode material due to the synergic enhancement effect of cobalt cations replacement with selenium and nickel. NCSe//NCO (Core/shell) nanowires were synthesized using a facile hydrothermal approach followed by annealing treatment. For a comparative study nickel cobalt oxide (NCO) was also synthesized by the same method. Electrochemical analysis affirmed the developed hierarchically mesoporous NCSe//NCO nanowires for supercapacitors. NCSe //NCO nanowires exhibit specific capacitance of 3281.54 Fig-1 at 1 Ag-1. Moreover, asymmetric testing by employing NCSe //NCO as positive electrode and Activated Carbon as a negative electrode. An asymmetric supercapacitor (ASC) with activated carbon shows high energy density 37.91 Wh kg-1 at a power density of 749.95W kg-1 and excellent capacitance retention of 116% over 7000 cycles with columbic efficiency of 99% at 20 Ag-