Selenium Decorated Reduced Graphene Oxide Supported CoSe2 Nanoparticles as Efficient Electrochemical Catalyst for the Oxygen Reduction Reaction

Abstract Developing efficient electrocatalysts for the oxygen reduction reaction (ORR) based on non‐precious catalytic centers is critical to improve the efficiency of low temperature fuel cells. Herein, we report on a catalyst containing CoSe 2 supported on selenium decorated reduced graphene oxide (CoSe 2 /Se‐rGO), which was synthesized via a one‐pot solvothermal method using Se‐rGO as support. Importantly, the CoSe 2 /Se‐rGO showed an enhanced catalytic activity for ORR in alkaline medium with an onset potential of 0.903 V vs. RHE and a half‐wave potential of 0.803 V vs. RHE. Its stability and methanol tolerance ability were significantly improved as compared to 20 wt% Pt/C, respectively. The strategy developed here provided a novel and efficient approach to prepare non‐precious electrocatalysts for ORR.