Facile Synthesis of Perovskite SrSnO ₃ /N‐rGO Composite as a Durable Electrocatalyst for Effective Oxygen Reduction Reaction

Abstract Designing a low‐cost, long‐lasting, and active electrocatalyst for the oxygen reduction reaction (ORR) is crucial to replace the high‐cost commercial Pt/C electrocatalyst. We have examined the electrocatalytic activity of a stannate‐based perovskite system modified with N‐doped reduced graphene oxide (SrSnO 3 /NrGO). The sol–gel method was used to synthesize SrSnO 3 nanoparticles. Later on, hydrothermal technique was employed to prepare SrSnO 3 /rGO and SrSnO 3 /NrGO, respectively. We assessed the ORR performance of all the three synthesized catalyst. Compared to SrSnO 3 and SrSnO 3 /rGO, the composites, SrSnO 3 /NrGO exhibit more activity in oxygen reduction processes in a 0.1 M KOH medium with an onset potential of 0.84 V versus RHE. In addition, SrSnO 3 /NrGO exhibits superior stability and better methanol tolerant when compared to commercial Pt/C (20 wt%).