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 (Pt /C) with remarkable ORR performance is reported. An acidic H /O single cell with Pt /C as cathode delivers a maximum power density of 520 mW cm at 80 °C, corresponding to a superhigh platinum utilization of 0.09 g  kW . Further physical characterization and density functional theory computations reveal that single Pt atoms anchored stably by four carbon atoms in carbon divacancies (Pt-C ) are the main active centers for the observed high ORR performance.