Enhanced Performance of Supercapacitors through Controlled Growth of Fe–Co–Ni Nanosheets

The utility of supercapacitors in various applications has recently received significant attention owing to the cognizance of high electrochemical activity of various combinations of ternary metal compounds. In this paper, we present a strategy for utilizing Fe–Co–Ni as an electrode material in supercapacitors. To enhance the electrochemical performance of the proposed ternary metal compound, we implemented controlled pulse deposition during the electrochemical process and analyzed the structural characteristics of the deposited Fe–Co–Ni. Distinct structural variations were observed based on the waveform and number of pulse repetitions employed during the manufacturing process. The specific capacitance of the ternary metal compound reached a maximum of 432.3 F g^–1 at a current density of 0.1 A g^–1 when 700 pulses were applied. In addition, it exhibited a capacitance retention rate of 72% at 1.5 A g^–1, with excellent cyclic stability, retaining 81% of its initial capacitance after 10,000 cycles. Our findings highlight the potential of this innovative electrochemical plating strategy for practical energy storage devices.