Abstract
Herein, we offer a new method to prepare Co0.8Fe0.2Se spheres enclosed with nanoparticles (Co0.8Fe0.2Se@NiF) as a cathode electrode and integrated porous FeSe2 (FeSe2@NiF) as an anode electrode to construct a high-performance asymmetric supercapacitor. The Co0.8Fe0.2Se@NiF electrochemical energy storage material shows a remarkable improvement of electrochemical performance containing low internal resistance, fast kinetics, good reversibility, considerable durability, and significant specific capacity (SC) of 309.31 mAh g–1. The advancement in electrochemical performance of the FeSe2@NiF subtends a good SC of 227.34 mAh g–1 and favorable durability. An asymmetric supercapacitor (ASC) device comprised of Co0.8Fe0.2Se@NiF as a cathode and FeSe2@NiF as an anode was assembled and evaluated. The assembled device shows an SC of 108.52 mAh g–1 and energy density (ED) of 89.53 Wh kg1– at a power density (PD) of 824.95 W kg1–. This improved electrochemical performance is dependent on the structural and intrinsic properties of both electrode materials, which can guarantee a hopeful potential for later generations of electronic systems.
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