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.