Combustion-synthesized rGO@LaSrMnO₃ electrode for supercapacitor application

Reduced graphene oxide (rGO) and lanthanum strontium manganite (LaSrMnO₃) have been widely studied for various applications due to their amazing physicochemical properties. This work explains the influence of reduced graphene oxide in LaSrMnO₃ perovskite, i.e., rGO@LaSrMnO₃ nanocomposite for supercapacitor application. A facile combustion route was employed to synthesize rGO@LaSrMnO₃ nanocomposites as promising electrode materials for supercapacitors. XRD analysis confirmed the perovskite structure of LaSrMnO₃, while FESEM and EDAX revealed intimate interfacial contact between rGO nanosheets and LaSrMnO₃ nanoparticles. BET measurements demonstrated a significant increase in surface area due to rGO incorporation, while FTIR spectroscopy confirmed the presence of oxygen vacancies. XPS analysis further corroborated the composite’s reduced graphene oxide state and Mn³⁺ oxidation states. Consequently, the rGO@LaSrMnO₃ (15R) electrode exhibited a remarkable specific capacitance of 1417.1 F/g at 1 A/g. This enhanced performance is attributed to the synergistic effect high electrical conductivity of rGO and the pseudocapacitive behavior of LaSrMnO₃. This work presents a rapid and scalable approach for fabricating high-performance supercapacitor electrodes with improved capacitance and cyclability.