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<p>Durable and highly active oxygen electrocatalysts are crucial to the large-scale application of rechargeable zinc-air batteries. Here we utilize the N<sub>4</sub> unit in phthalocyanine molecule to trap the tungsten atoms scratched off from the tungsten carbide milling balls and place the obtained W-N<sub>4</sub> unit adjacent to the Fe-N<sub>4</sub> units from iron (Ⅱ) phthalocyanine, resulting in highly active Fe-N<sub>4</sub>/W-N<sub>4</sub> diatomic sites with well-pronounced 3<i>d</i>−5<i>d</i> hybrid for efficient and durable oxygen electrocatalysis. The electron distribution of the Fe-N<sub>4</sub> site is optimized by the neighboring W-N<sub>4</sub> site, which facilitates the O<sub>2</sub> activation and the desorption of *OH and enhances the catalytic activity of the Fe-N<sub>4</sub> site. Meanwhile, the unsaturated 5 <i>d</i> orbitals and tunable valence of the W atoms could modulate the electronic state of the Fe species, prevent leaching, and further enhance the catalytic stability. The resulting zinc-air battery with Fe,W-N-C air cathode exhibits notable cycling stability and repeatability for over 10,000 h. This enhanced stability highlights the possibility of developing 5 <i>d</i> metal-boosted 3 <i>d</i> metal active sites for the fabrication of efficient oxygen electrocatalysts and stable zinc-air batteries.</p>

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Ten thousand hour stable zinc air batteries via Fe and W dual atom sites

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月29日

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  • Yifan Li,
  • Hanlin Wang,
  • Chang Chen,
  • Xuesong Xie,
  • Yang Yang,
  • Xuehai Tan,
  • Keren Jiang,
  • Ning Chen,
  • Hao Zhang,
  • Zhi Li

摘要

Durable and highly active oxygen electrocatalysts are crucial to the large-scale application of rechargeable zinc-air batteries. Here we utilize the N4 unit in phthalocyanine molecule to trap the tungsten atoms scratched off from the tungsten carbide milling balls and place the obtained W-N4 unit adjacent to the Fe-N4 units from iron (Ⅱ) phthalocyanine, resulting in highly active Fe-N4/W-N4 diatomic sites with well-pronounced 3d−5d hybrid for efficient and durable oxygen electrocatalysis. The electron distribution of the Fe-N4 site is optimized by the neighboring W-N4 site, which facilitates the O2 activation and the desorption of *OH and enhances the catalytic activity of the Fe-N4 site. Meanwhile, the unsaturated 5 d orbitals and tunable valence of the W atoms could modulate the electronic state of the Fe species, prevent leaching, and further enhance the catalytic stability. The resulting zinc-air battery with Fe,W-N-C air cathode exhibits notable cycling stability and repeatability for over 10,000 h. This enhanced stability highlights the possibility of developing 5 d metal-boosted 3 d metal active sites for the fabrication of efficient oxygen electrocatalysts and stable zinc-air batteries.