Enhanced electrochemical behavior of Co

In this research, we introduce a novel strategy for developing electrode materials for supercapacitors (SCs) by synthesizing and comparing three distinct systems: cobalt oxide (Co3O4), MoNi Layered Double Hydroxide (MoNi-LDH), and a Co3O4-doped MoNi-LDH nanocomposite (Co3O4@MoNi-LDH) to exploit their synergistic interaction. The materials were synthesized via a hydrothermal method and characterized using X-Ray Diffraction (XRD), Fourier-Transform Infrared Spectroscopy (FTIR), Field-Emission Scanning Electron Microscopy (FESEM), and Energy Dispersive X-Ray Spectroscopy (EDS). Electrochemical properties were assessed through Cyclic Voltammetry (CV), Galvanostatic Charge-Discharge (GCD), and Electrochemical Impedance Spectroscopy (EIS) techniques. The Co3O4@MoNi-LDH composite demonstrated a significantly enhanced electrochemical performance, achieving a specific capacitance of 466.5 F g⁻¹ at 2 A g⁻¹, which is approximately 7 times higher than pristine Co3O4 and more than 2 times higher than MoNi-LDH. The corresponding energy density (165.87 Wh kg⁻¹) is similarly enhanced, showing over a 7-fold improvement compared to Co3O4 and more than double that of MoNi-LDH. This substantial improvement is attributed to the synergistic effect between the two phases, where Co3O4 introduces abundant redox-active sites while the MoNi-LDH structure facilitates rapid ion diffusion and structural stability. The integration of Co3O4 within the LDH framework results in a more interconnected porous network, increases the electroactive surface area, and reduces electrolyte-ion diffusion resistance of electrolyte ions. These features enable more efficient charge storage and delivery, making the composite a highly promising candidate for next-generation energy storage devices.