Synergistic Nanoarchitectonics of SrNiO₃ Reinforced with rGO Matrix for Improved Catalytic Performance in Oxygen Evolution Reaction

The ongoing demand for sustainable and efficient electrode material for efficient oxygen evolution reaction (OER) has simulated considerable research in the development of novel electroactive catalysts. This study shows substantial advancement in the utilization of an optimized framework of metal oxides like perovskite-type oxides, combined with reduced graphene oxide (rGO) as an electroactive material for a slower OER process. In this way, we designed a rGO/SrNiO₃ composite as viable and economical electrocatalysts using a sonication technique for enhanced OER activity. The composite electrochemical activity in the context of OER was assessed in a 1.0 M KOH electrolytic solution. Electrochemical outcomes of composite rGO/SrNiO₃ displayed remarkable potential for the OER process by demanding an overpotential (η) of 259 mV at current density (10 mA/cm²). Moreover, the produced nanocomposite demonstrated a minimal Tafel slope (34 mV dec) and lower impedance, illustrating the efficient charge transfer resulting in improved catalytic OER performance. Further, investigation demonstrated that the nanocomposite showed an increased electrochemically active surface area (261.25 cm²) and significant stability for 50 h. The above-stated results indicate that the composite exhibits a high active site density showcasing enhanced charge transfer, improved reaction kinetics and prolonged stability resulting from a synergistic combination of rGO and SrNiO₃.This study investigates how the rGO/SrNiO₃ composite surpasses conventional electrocatalysts, presenting a new approach for efficient and economical catalysts for OER.