Performance of Electrochemically Synthesized Nickel-Zinc and Nickel-Iron (Ni–Zn//Ni–Fe) Nanowires as Battery Type Supercapacitor

Herein, a high performance Ni–Fe composite nanowires array based supercapacitor anode was fabricated via electrochemical deposition using polycarbonate membrane. The synthesized nanowires demonstrate outstanding electrochemical performance with good specific capacitance of 1255.17 Fg−1 at 3 Ag−1 and 80% capacitive retention at the end of 5000 charge-discharge cycles. In addition, an asymmetrical supercapacitor (Ni–Zn//Ni–Fe) was also fabricated that demonstrates 95.23% of capacitive retention after 2000 cycles. The fabricated supercapacitor device showed energy density of 63.62 Wh kg−1 at a power density of 0.64 KW kg−1. Further, the practical performance of a single asymmetrical supercapacitor device was demonstrated by lighting up a 2.2 V green LED. These results reveal the potential of the synthesized nanowires in potable energy storage gadgets.