Facile Synthesis and Electrochemical Study of CuMn2O4/Functionalized Activated Carbon Binary Composite as a High-Performance Supercapacitor Electrode Material

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.