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Abstract Single‐atom catalysts (SACs) with high activity and efficient atom utilization for oxygen reduction reactions (ORRs) are imperative for rechargeable Zinc‐air batteries (ZABs). However, it is still a prominent challenge to construct a noble‐metal‐free SAC with low cost but high efficiency. Herein, a novel nitrogen‐doped graphene (NrGO) based SAC, immobilized with atomically dispersed single cobalt (Co) atoms (Co‐NrGO‐SAC), is reported for ORRs. In this 3D NrGO, the Co‐N 4 sites endow high‐efficiency ORR activity, and the 3D‐interconnected porous architectures of NrGOs guarantee numberous active sites accessibility. Compared to commercial Pt/C catalyst (≈5.8 mA cm −2 ), as‐prepared Co‐NrGO‐SACs presents considerable limiting current density of ≈5.9 mA cm −2 , prominent half‐wave potential of ≈0.84 V, onset potential of ≈1.05 V, and as well as superior methanol resistance. Particularly, ZABs with Co‐NrGO‐SACs deliver remarkable power density (≈240 mW cm −2 ), super durability of over 233 h at 5 mA cm −2 , outperforming noble‐metal‐based benchmarks. This work provides an effective noble‐metal free carbon‐based SAC nano‐engineering for superdurable ZABs.
Zou et al. (Wed,) studied this question.