Electrochemical properties of MnMoO4 nanoparticles for energy storage applications synthesized via a green approach using Camellia sinensis extract as a reducing and stabilizing agent

Abstract

Flavonoid and polyphenol-rich Camellia sinensis (green tea) leaf extract was used to reduce and stabilize forming manganese molybdate (MnMoO₄) nanoparticles, which were prepared by a green synthesis via a hydrothermal method. This approach promotes environmental sustainability by utilizing active components in green tea. The X-ray diffraction (XRD) technique revealed that the MnMoO₄ had a monoclinic crystal structure with a crystallite size of 24.50 nm and d-spacing of 3.51 Å. Nanospheres were observed using scanning electron microscopy (SEM). Also, Brunauer–Emmett–Teller (BET) analysis performed on the material showed that it was a mesoporous material. EIS studies after GCD showed low charge transfer resistance of 0.21 ohm, which showed that the charge transport was good. Cyclic voltammetry (CV) results showed two redox peaks at 0.44 V and 0.31 V signifying pseudo capacitance. Galvanostatic charge–discharge (GCD) tests were performed on MnMoO₄ nanoparticles confirming their high potential for use as supercapacitors with a capacitance of 2115 F g⁻¹ at a current density of 0.8 A g⁻¹. So, MnMoO₄ played a significant role in energy storage applications as they exhibited favorable characteristics that were suitable for the applications.