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

Pt single atoms anchored by four carbon atoms neighboring carbon divacancies (Pt‐C₄ sites) show high ORR performance. An acidic H₂/O₂ single cell with Pt/C as the 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.

Abstract

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.

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