Carbon‐Supported Divacancy‐Anchored Platinum Single‐Atom Electrocatalysts with Superhigh Pt Utilization for the Oxygen Reduction Reaction

Maximizing the platinum utilization in electrocatalysts toward oxygen reduction reaction (ORR) is very desirable for large-scale sustainable application of Pt in energy systems. A cost-effective carbon-supported carbon-defect-anchored platinum single-atom electrocatalysts (Pt₁ /C) with remarkable ORR performance is reported. An acidic H₂ /O₂ single cell with Pt₁ /C as cathode delivers a maximum power density of 520 mW cm^-2 at 80 °C, corresponding to a superhigh platinum utilization of 0.09 g_Pt kW^-1 . Further physical characterization and density functional theory computations reveal that single Pt atoms anchored stably by four carbon atoms in carbon divacancies (Pt-C₄ ) are the main active centers for the observed high ORR performance.