Reduced graphene oxide correlated electrochemical energy storage behavior of La₂MnFeO₆/rGO composite microspheres

The study focuses on the microstructural and electrochemical properties of pristine La₂MnFeO₆ (LMFO) and La₂MnFeO₆/rGO composite. The powder X-ray diffraction (XRD) of LMFO microspheres revealed an orthorhombic structure with space group Pnma. The estimated lattice parameters are a = 5.57 Å, b = 7.80 Å, and c = 5.54 Å with α = β = γ = 90°. The LMFO/rGO composite showed an identical XRD pattern to LMFO. The scanning electron microscopy revealed the existence of microspheres with agglomerated crystallites in both LMFO and LMFO/rGO samples. Brunauer–Emmett–Teller analysis revealed that the composite LMFO/rGO (~ 23.43 m² g⁻¹) has slightly higher surface area than pristine LMFO (~ 21.26 m² g⁻¹) due to the presence of porous reduced graphene oxide (rGO). The oxidation states of constituent elements, La³⁺, Fe³⁺, Mn²⁺/Mn³⁺, and O²⁻, were confirmed through X-ray photoelectron spectroscopy. The specific capacitance values for pristine LMFO and composite LMFO/rGO are found to be 320.7 Fg⁻¹ and 416.2 Fg⁻¹, respectively at the current density of 1 Ag⁻¹.