Synthesis and characterization of Mn₃O₄/MnSnO₃ nanocomposites for supercapacitor applications

Mn₃O₄/MnSnO₃ nanocomposites have been successfully synthesized via solvothermal method by using the mixed solution consisting of manganese chloride and tin chloride salt dissolved in the mixture of ethanol and deionized water in 50:50 ratio at the processing temperature of 180 °C by adapting different capping agents such as PVP, PVA and ethylene glycol. The synthesized Mn₃O₄/MnSnO₃ nanocomposites were characterized by employing X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, photoluminescence spectra and scanning electron microscopy (SEM) studies. The obtained XRD spectra confirmed the formations of Mn₃O₄/MnSnO₃ nanocomposite illustrated by the sharp predominant diffraction peak observed at 34.2° corresponding to the (021) lattice planes of Mn₃O₄. The SEM images supply the information about the morphology of synthesized Mn₃O₄/MnSnO₃ nanocomposites. The sharp peaks observed at 483 cm⁻¹ further characterize the presence of Mn–O stretching vibration bond in Mn₃O₄/MnSnO₃ nanocomposite by employing Raman spectra. The PL result revealed the emissive nature of the sample. FTIR spectra observed at 625 cm⁻¹ attributed to the characteristic peaks of Mn₃O₄/MnSnO₃ nanocomposite. The Mn₃O₄/MnSnO₃ nanocomposite synthesized by the assistance of PVP surfactant exhibits the high specific capacitance of 178.2 F g⁻¹ at 0.5 Ag⁻¹ current density which can be considered as potential candidate and excellent electrode for pseudocapacitors applications.