Enhanced energy storage performance of samarium manganese iron oxide — reduced graphene oxide composites: A structural and electrochemical investigation

Supercapacitors are efficient energy storage systems that provide high power density and long cycle life. Recently, composite material-based supercapacitors have gained popularity as environmentally benign and effective energy-saving solutions. In this study, the microstructural and electrochemical properties of pristine Sm₂MnFeO₆ (SMFO) and reduced graphene oxide (rGO) composite Sm₂MnFeO₆/rGO (SMFO/rGO) are explored. Structural characterization provides insights into the lattice parameters of SMFO and SMFO/rGO material, while morphological analysis highlights the presence of agglomerated crystallites in both materials. Surface area measurements indicate an increase in porosity upon rGO incorporation, and elemental analysis confirms the oxidation states of the constituent elements in SMFO and the SMFO/rGO composite. Electrochemical investigations demonstrate the impact of rGO on charge storage capabilities, offering valuable insights into the potential of SMFO/rGO as an efficient electrode material for supercapacitor applications. The specific capacitance of SMFO/rGO improved by ∼155 % (505.3 Fg⁻¹) compared to SMFO (197.8 Fg⁻¹) at a current density 5 mVs⁻¹.