Oxygen Reduction Reaction Catalysts for Zinc‐Air Batteries Featuring Single Cobalt Atoms in a Nitrogen‐Doped 3D‐Interconnected Porous Graphene Framework

IF 13 2区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Small Pub Date : 2025-01-15 DOI:10.1002/smll.202409506

Jiaxin Zou, Lishi Bao, Qifeng Sun, Chenguang Bao, Hui Chen, Hongbo Liu

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引用次数: 0

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‐N4 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.

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来源期刊

Small 工程技术-材料科学：综合

CiteScore

17.70

自引率

3.80%

发文量

1830

审稿时长

2.1 months

期刊介绍： Small serves as an exceptional platform for both experimental and theoretical studies in fundamental and applied interdisciplinary research at the nano- and microscale. The journal offers a compelling mix of peer-reviewed Research Articles, Reviews, Perspectives, and Comments. With a remarkable 2022 Journal Impact Factor of 13.3 (Journal Citation Reports from Clarivate Analytics, 2023), Small remains among the top multidisciplinary journals, covering a wide range of topics at the interface of materials science, chemistry, physics, engineering, medicine, and biology. Small's readership includes biochemists, biologists, biomedical scientists, chemists, engineers, information technologists, materials scientists, physicists, and theoreticians alike.