Abstract:
Supercapacitors have become more and more popular as energy storage devices due to their
extended cyclic stability, efficient power output, quick rate of charge and discharge, and ease
of use. A straightforward hydrothermal method was utilized to synthesize the metal oxide
CuMn₂O4 and the binary composite CuMn₂O4/Functionalized Activated Carbon (FAC). X-ray
diffraction (XRD) analysis was performed to ascertain the synthesized material's crystal
structure. The presence of functional groups in the binary composite was verified by Fourier
transform infrared spectroscopy (FTIR), revealing three bands at 460 cm⁻¹, 600 cm⁻¹, and 1039
cm⁻¹ representing the vibrations of Mn-O, Cu-O, and C-OH, respectively. Other
characterization methods were also carried out, including SEM, EDX, XPS, and TGA. The
synthesized material's electrochemical performance was assessed through galvanostatic
chargeodischarge (GCD), electrochemical impedanceospectroscopy (EIS), and cyclic
voltammetry (CV). The binary composite CuMn₂O4/FAC exhibited an excellent specific
capacitanceoof 2500 F/g at a current density of 1 A/g in a 2 MoKOH solution, which served as
the electrolyte. It demonstrated a high specific power of 250 W/kg and a specific energy of
86.6 Wh/kg. Furthermore, it maintained good cycling durability, preserving 87.8% of its
primary value of capacity after 7000 cycles.
