A study of electrochemical properties of Fe doped spinel copper cobaltite CuCo2O4 for supercapacitor application

The pursuit of higher energy and power densities in nanomaterials and micromaterials has been the primary cause of the current explosion in supercapacitor research. In this study, spinel pure copper cobaltite CuCo₂O₄ (CC0) and Fe doped CuCo₂O₄ electrodes at different mole concentrations (FCC1–0.05 M, FCC2–0.1 M, FCC3–0.15 M, and FCC4–0.2 M) of metal mole complexes are made utilizing the sol-gel procedure using solvents such as citric acid and water. Using Fourier Transform Infrared (FTIR), X-ray diffraction (XRD), Scanning Electron Microscope (SEM), HRTEM, and XPS, the resulting sample is systematically examined to analyze its functional group, crystallite size, shape, and chemical composition. All electrodes are Electric Double Layer Capacitors (EDLCs), according to the Cyclic Voltammetry (CV) test. The Galvanostatic Charge – Discharge (GCD) analysis confirmed that the pure CuCo₂O₄ (CC0) electrode has a specific capacitance of 80.61F/g at the same current density, while the Fe doped 0.2 M CuCo₂O₄ (FCC4) electrode has the highest specific capacitance, reaching 163.20F/g at a current density of 1 A/g. Following that, a two-electrode configuration is constructed, such as a Fe doped 0.2 M CuCo₂O₄ (FCC4) electrode and an activated carbon (AC) electrode. With a specific capacity of 11.62 F/g at a current density of 1 A/g, an energy density of 2.32 Whkg^-1, and an impressive power density of 149.99 Wkg^-1, the ASC device exhibits outstanding characteristics. The device has a high total capacitive retention value of 99.84 % after 2000 cycles, and supercapacitor devices in particular show remarkable cycle stability. These findings demonstrate that the Fe doped 0.2 M CuCo₂O₄ (FCC4) electrode has superior electrochemical performance, making it a promising electrode material for supercapacitor applications compared to pure CuCo₂O₄ (CC0).