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Hierarchical porous yolk-shell Co-N-C nanocatalysts encaged ingraphene nanopockets for high-performance Zn-air battery

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Abstract

The rational design and preparation of promising cathode electrocatalysts with excellent activity and strong stability for metal-air batteries is a huge challenge. In this work, we innovate an approach of combining solvothermal with high-temperature pyrolysis utilizing zeolitic imidazolate framework (ZIF)-8 and ZIF-67 as the template to synthesize a novel hybrid material of hierarchical porous yolk-shell Co-N-C polyhedron nanocatalysts engaged in graphene nanopocket (yolk-shell Co-N-C@GNP). The obtained catalyst exhibits prominent bifunctional electrocatalytic performance for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in the alkaline condition, in which the half-wave potential is 0.86 V for ORR, and the over-potential for OER is 0.42 V at 10 mA·cm−2. The rechargeable aqueous Zn-air battery fabricated with yolk-shell Co-N-C@GNP cathode deliveries an open circuit voltage (OCV) of 1.60 V, a peak power density of 236.2 mW·cm−2, and excellent cycling stability over 94 h at 5 mA·cm−2. The quasi-solid-state Zn-air battery (ZAB) using yolk-shell Co-N-C@GNP displays a high OCV of 1.40 V and a small voltage gap of 0.88 V in continuous cycling tests at 2 mA·cm−2. This work provides a valuable thought to focus attention on the design of high-efficient bifunctional catalysts with hierarchical porous yolk-shell framework and high-density metal active sites for metal-air battery technologies.

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Acknowledgements

This study was supported by the National Natural Science Foundation of China (Nos. 22008058 and 52074119), the Joint Funds of National Natural Science Foundation of China (No. U20A20280), the program for Innovative Teams of Outstanding Young and Middle-aged Researchers in the Higher Education Institutions of Hubei Province (No. T2021010), the Joint supported by Hubei Provincial Natural Science Foundation and Huangshi of China (No. 2022CFD039), the Postgraduate Innovative Research Project of Hubei Normal University (Nos. 20220512 and 20220552), and College Students innovation and entrepreneurship training program of Hubei Province (No. S202210513055).

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Authors and Affiliations

  1. Institute for Advanced Materials, Hubei Normal University, Huangshi, 435002, China

    Yisi Liu, Zongxu Li, **nan Xuan, Dongbin **ong, Lina Zhou, Jianqing Zhou, Jun Wang & Yue Du

  2. Jiangsu Key Laboratory of Materials and Technology for Energy Conversion, College of Material Science and Engineering, Nan**g University of Aeronautics and Astronautics, Nan**g, 210016, China

    Shizhu Wang

  3. National & Local Joint Engineering Laboratory for New Petro-chemical Materials and Fine Utilization of Resources, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, 410081, China

    Yahui Yang

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  1. Yisi Liu
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Liu, Y., Li, Z., Wang, S. et al. Hierarchical porous yolk-shell Co-N-C nanocatalysts encaged ingraphene nanopockets for high-performance Zn-air battery. Nano Res. 16, 8893–8901 (2023). https://doi.org/10.1007/s12274-023-5593-2

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