Synthesis and Electrochemical Performance of ZnO:MnO:VO Ternary Metal Oxide Nanocomposite for Supercapacitor Applications

This investigation describes both the synthesis process and detailed inspection of ZnO:MnO:VO nanocomposites which were made through hydrothermal processing and subsequent heating treatment. X-ray diffraction results showed that the prepared nanocomposite structure primarily contained the FCC phase of MnO and small amounts of Wurtzite ZnO and Orthorhombic VO phases. The nanocomposite contains tiny crystalline grains rabged from 1.50 to 3.71 nm, as determined through the Debye-Scherrer formula. The characteristic FTIR vibrational modes from metal-oxygen (M–O) bonds validated the composite formation in the analysis. The Scanning Electron Microscope showed rod-shaped components with lengths from 1 µm to 10 µm and Energy Dispersive X-ray Spectroscopy demonstrated that all four atomic elements of Zn, Mn and V and O existed evenly throughout the composite structure. The structural analysis showed strong crystalline content and complete phase purity because no additional impurities were present. The electrochemical assessment of the ZnO:MnO:VO nanocomposite took place through CV and GCD and EIS testing in 1M KOH aqueous electrolyte. The specific capacitance by CV and GCD analysis were found 232.11 Fg⁻¹ and 222.75 Fg⁻¹ respectively. The structural and morphological properties of ZnO:MnO:VO nanocomposite are suitable for supercapacitor applications and finds high capacitive devices.