Reasonable design of low‐cost, high‐efficiency and stable bifunctional oxygen electrocatalysts is of great significance to improve the reaction efficiency of Zn‐air batteries, which is still a huge challenge. Here, we report a highly efficient bifunctional oxygen electrocatalyst with three‐dimensional (3D) N‐doped graphene network‐supported cobalt and cobalt oxide nanoparticles (Co/CoO‐NG), which can be in situ synthesized by inducing metal ions on metal plates via graphene oxide as an inducer. This 3D network structure and open active center show excellent bifunctional oxygen electrocatalytic activity under alkaline conditions, and can be used as an air electrode in rechargeable Zn‐air batteries, with significantly better power density (244.28 mW cm‐2) and stability (over 340 h) than commercial Pt/C + RuO2 mixtures. This work is conducive to advancing the practical application of graphene‐based materials as air electrodes for rechargeable zinc‐air batteries.

中文翻译：

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氮掺杂石墨烯网络支持的Co/CoO纳米颗粒的通用且简便的合成作为锌空气电池的高效氧电催化剂

合理设计低成本、高效、稳定的双功能氧电催化剂对于提高锌空气电池的反应效率具有重要意义，但这仍然是一个巨大的挑战。在这里，我们报道了一种高效双功能氧电催化剂，具有三维（3D）N掺杂石墨烯网络负载的钴和氧化钴纳米颗粒（Co/CoO-NG），可以通过在金属板上诱导金属离子来原位合成通过氧化石墨烯作为诱导剂。这种3D网络结构和开放的活性中心在碱性条件下表现出优异的双功能氧电催化活性，可用作可充电锌空气电池的空气电极，具有明显更好的功率密度（244.28 mW cm-2）和稳定性（超过340 h) 优于商业 Pt/C + RuO2 混合物。这项工作有利于推进石墨烯基材料作为可充电锌空气电池空气电极的实际应用。