Investigations of ternary Cu-Mn-Zn oxide nanocomposites as potential electrode for hybrid supercapacitors by one-pot hydrothermal method

Ternary metal oxide nanocomposites (NCs) electrodes are promising active material in supercapacitors (SCs) applications, owing to their exceptional electrochemical performances with numerous oxidation states. In this present work, ternary Cu-Mn-Zn Oxide NCs are successfully synthesized through simple one-pot hydrothermal method. The structure, chemical bonds, morphology, elemental compositions, and binding energy values of prepared Cu-Mn-Zn Oxide ternary NCs are analyzed through XRD, FTIR, FESEM, EDX, HRTEM, and XPS techniques. Also, the electrochemical activities of fabricated electrodes are studied by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge-discharge (GCD) analysis. As a result, the Cu-Mn-Zn Oxide ternary NCs exhibits maximum specific capacitance (Csp1) of 806.83 F/g at 10 mV/s scan rate, which is higher than the binary CuMn2O4 (205.00 F/g) and ZnMn2O4 (346.00 F/g) electrode materials. In addition, the ternary NCs electrode provides 217.10 F/g, 675.75 F/g, and 892.85 F/g of outer (Q *outer ), inner (Q *inner ), and total (Q *total ) capacitances from Trasatti analysis. Furthermore, the Cu-Mn-Zn Oxide//AC hybrid (HSC) supercapacitor device has been fabricated, which delivers good specific capacitance (Csp4) of 188.57 F/g at 2 A/g current density, and high energy density (EHSC) of 44.26 Wh/kg at the corresponding power density (PHSC) of 1299.99 W/kg. Additionally, the constructed HSC device manifests 86.65 % of capacitive retention and 111.13 % of coulombic efficiency after 3000 cycles. This result implies that the ternary Cu-Mn-Zn Oxide NCs has been employed as an effective active electrode material for futuristic energy storage technologies.