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<p>As potential candidates to be employed as air anodes in metal-air batteries, transition metal phosphides (TMPs) have received considerable attention due to their excellent electrocatalytic activity. This work presents a straightforward method for efficiently fabricating a three-dimensional (3D) reticulated carbon N, P-doped carbon structure generated from polyaniline-phytic acid polymer, with Co<sub>2</sub>P and Co<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub> nanoparticles implanted on the carbon matrix (CoPO-Co<sub>2</sub>P@NPC). As-fabricated CoPO-Co<sub>2</sub>P@NPC demonstrates impressive bifunctional oxygen reduction reactions (ORR)/oxygen evolution reactions (OER) performances. A diffusion-limiting current density of 6.56 mA cm<sup>−2</sup>, a half-wave potential of 0.80 V, and an overpotential of 1.73 V are detected at 10 mA cm<sup>−2</sup>. The CoPO-Co<sub>2</sub>P@NPC assembled rechargeable Zn-Air battery (RZAB) demonstrates a high-power density of 265 mW cm<sup>−2</sup>, with excellent cycling stability over 450 h. The composite based on Co<sub>2</sub>P-Co<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub> demonstrates outstanding bifunctional electrocatalytic performance, which makes it a desirable anode material for RZABs.</p> Graphical abstract <p></p>

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One step, in situ phosphating construction of encapsulated Co2P and Co3(PO4)2 nanoparticles within 3D reticulated carbon for rechargeable Zn-air batteries

  • 期刊论文

  • 发表日期：

    2025年10月27日

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  • Gang Chen,
  • Lina Zhou,
  • Xin Xiong,
  • Xiaonan Xu,
  • Yingying Wang

摘要

As potential candidates to be employed as air anodes in metal-air batteries, transition metal phosphides (TMPs) have received considerable attention due to their excellent electrocatalytic activity. This work presents a straightforward method for efficiently fabricating a three-dimensional (3D) reticulated carbon N, P-doped carbon structure generated from polyaniline-phytic acid polymer, with Co2P and Co3(PO4)2 nanoparticles implanted on the carbon matrix (CoPO-Co2P@NPC). As-fabricated CoPO-Co2P@NPC demonstrates impressive bifunctional oxygen reduction reactions (ORR)/oxygen evolution reactions (OER) performances. A diffusion-limiting current density of 6.56 mA cm−2, a half-wave potential of 0.80 V, and an overpotential of 1.73 V are detected at 10 mA cm−2. The CoPO-Co2P@NPC assembled rechargeable Zn-Air battery (RZAB) demonstrates a high-power density of 265 mW cm−2, with excellent cycling stability over 450 h. The composite based on Co2P-Co3(PO4)2 demonstrates outstanding bifunctional electrocatalytic performance, which makes it a desirable anode material for RZABs.

Graphical abstract