Rational design of cost‐effective oxygen electrode catalysts for metal‐air batteries is indispensable for developing next‐generation energy storage devices especially to use in electric vehicles. In this work, non‐precious Nickel/Nickel Ferrite on carbon matrix (NNFOC) nanocomposite as bifunctional air‐breathing electrode for rechargeable Li‐air battery is proposed. The NNFOC composite on rotating ring disc electrode (RRDE) exhibited good oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) activities. The synergistic contribution from Ni, nickel ferrite and porous carbon network that resulted more reaction sites, high conductivity and fast diffusion pathways, lead to enhanced ORR and OER activities. The CR‐2032 coin‐type and conventional split cell Li‐air battery were fabricated using the NNFOC composite as air‐breathing oxygen electrode and lithium metal as anode. The open‐circuit voltage of the coin cell was invariant for more than 5 days, while the split cell exhibited high discharge capacity of 3820 mAh g^‐1 at a current density of 50 mA g^‐1. The charged split cell could power a commercial 2.8 V LED bulb for more than 5 h continuously.

中文翻译：

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花椰菜样的分层多孔镍/镍铁氧体/碳复合材料，是锂空气电池的高级双功能催化剂

对于开发尤其是用于电动汽车的下一代储能设备，合理设计用于金属空气电池的经济高效的氧电极催化剂是必不可少的。在这项工作中，提出了非贵金属的镍/镍铁氧体碳纳米复合材料（NNFOC）作为可充电锂空气电池的双功能空气呼吸电极。旋转环盘电极（RRDE）上的NNFOC复合材料表现出良好的氧还原反应（ORR）和氧释放反应（OER）活性。镍，铁氧体镍和多孔碳网络的协同作用导致更多的反应位点，高电导率和快速扩散途径，导致增强的ORR和OER活性。CR-2032硬币型和传统的分体式锂空气电池是使用NNFOC复合材料作为呼吸氧气电极和锂金属作为阳极制造的。纽扣电池的开路电压持续超过5天不变，而分体式电池展现出3820 mAh g的高放电容量^‐1，电流密度为50 mA g ^-1。充电后的分离式电池可连续为商用2.8 V LED灯泡供电5小时以上。