Development of MnAl₂O₄/Ni₃Se₂ nanocomposite for enhanced electrocapacitive performance

Fossil fuel utilization leads to environmental pollution and depletion of energy supplies, prompting the preparation of environmentally friend and advanced energy storage devices. In the present research, we synthesize the MnAl₂O₄/Ni₃Se₂ nanocomposite via an effective sonication method as supercapacitor electrode material. The MnAl₂O₄/Ni₃Se₂ nanocomposite demonstrated a higher specific capacitance (1659.67 F/g), energy density (51.18 Wh/kg) along with a power density (235.6 W/kg) at 1 A/g determined from galvanostatic charge-discharge plot which demonstrated cyclic stability of 25 h over 5000^th cycle. Furthermore, compared to pure Ni₃Se₂ (0.72 Ω), MnAl₂O₄/Ni₃Se₂ nanocomposite material exhibited a low charge transfer resistance (0.39 Ω) calculated via the Nyquist plot. The small surface area of Ni₃Se₂ had been improved with the inclusion of MnAl₂O₄ in the fabrication of MnAl₂O₄/Ni₃Se₂ nanocomposite leading to enhance surface area, more active sites and lower resistance responsible for improvement in nanocomposite electrochemical properties. This work revealed that developed nanocomposite’s energy-storing qualities make it suitable as an electrode material in supercapacitors.