Abstract
Electrocatalysts play a crucial role in the per-formance of rechargeable Zn-air batteries(ZABs),but it is still difficult to produce nonprecious materials with excel-lent bifunctional oxygen reduction reactions(ORR)and oxygen evolution reactions(OER).Herein,conjugated polyaniline-phytic acid polymer(pANI-PA)was directly calcined to fabricate Co2P nanoparticles embedded in N,P-doped carbon network composites(Co2P@pDC-PA)for metal-air cathodes.The resulting pANI-PA derived Co2P-based carbon composite exhibits exceptional bifunctional ORR/OER activities with a half-wave potential of 0.79 V for ORR and 1.62 V of over-potential for OER at 10 mA·cm-2.Owing to the synergistic effect of its unique three-dimensional(3D)structure,N,P-doped carbon framework,and encapsulated Co2P nanoparticles,as-fab-ricated composite can be used as a highly efficient air cathode in the rechargeable metal-air battery.The assem-bled rechargeable ZAB demonstrates a high-power density of 190.0 mW·cm-2 and remarkable cycling stability over 1000 h.This study introduced a novel approach that paves the way for the efficient,cost-effective,and scalable pro-duction of bifunctional electrocatalysts for rechargeable ZABs.
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