Synthesis of Manganese Molybdate (MnMoO₄) Nanorods by Co-precipitation Method for Supercapacitor Applications

Abstract: The research explores the supercapacitance of MnMoO₄ nanorods (NRs) synthesized by co-precipitation method. Structural, morphological and optical properties of MnMoO₄ NRs were analyzed by various characterization techniques such as X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), UV-Vis diffuse reflectance spectra (UV-DRS), Field emission scanning electron microscopy (FE-SEM), Energy dispersive X-ray spectroscopy (EDX), and Thermo gravimetric analysis (TGA). Powder XRD analysis confirmed the monoclinic crystal structure and the crystalline size (32.97 nm) were calculated by Debye Scherer formula. FTIR show the stretching vibration of Mn–O bonds at 583 cm^–1. UV–DRS analysis was used to calculate the band gap and the value is 3.24 eV. FE-SEM exhibits the rod like nanostructure of the samples. EDX analysis confirmed the elemental composition of Mn, O, Mo, and there are no other impurities were present. Thermal decomposition and stability of the prepared samples analyzed by TGA studies, indicates a weight loss of 4.25% was obtained at 800°C. CV is used to conform the supercapacitor nature of the MnMoO₄ nanorods. Rapid redox processes are facilitated by nanostructured MnMoO₄, as evidenced by the CV curves, which show that the distance between the oxidation and reduction peaks increased with higher scan rates. With respect to various current densities of 1, 2, 3, 4, and 5 Ag^–1, the computed specific capacitance values were 13.1, 10.75, 9.84, 9.31, and 1.02 Fg^–1.