Zinc-air batteries are the promising electrochemical energy conversion and storage devices due to their high theoretical energy density, environmental benignity, low cost and safety. Developing high-performing bifunctional catalyst to improve the ORR and OER kinetic is the key issue of the researchable zinc-air battery. In this work, ultra-thin NiCo₂S₄ nanosheets with reduced graphene oxide hybrid materials (NiCo₂S₄/RGO) have been successfully developed. The hybrid catalyst shows a unique hierarchical structure with large surface area, which provides the quick transport pathways and abundant active sites for both ORR and OER. Notably, the conversion of oxides to sulfides changes the electrons state of the metal oxides and create more oxygen defective compared with pure NiCo₂O₄, effectively improving the ORR/OER′ activity. The strong synergistic effect between NiCo₂S₄ and RGO further facilitating the intrinsic oxygen reaction process. As expected, the NiCo₂S₄/RGO bifunctional catalysts demonstrate enhanced ORR/OER activity (ΔE: 0.91 V) and stability, along with the high battery performance (262.6 mW cm⁻² and 750 chare-discharge cycles). The work open's great application prospects of sulfides in rechargeable zinc-air batteries.

锌空气电池由于其理论能量密度高，环境友好，成本低廉和安全性高而成为有前途的电化学能量转换和存储设备。开发高性能的双功能催化剂以改善ORR和OER动力学是可研究的锌空气电池的关键问题。在这项工作中，具有减少的氧化石墨烯杂化材料（NiCo ₂ S ₄的超薄NiCo ₂ S ₄纳米片/ RGO）已成功开发。杂化催化剂显示出独特的具有大表面积的分层结构，为ORR和OER提供了快速的运输途径和丰富的活性位点。值得注意的是，与纯NiCo ₂ O ₄相比，氧化物到硫化物的转化会改变金属氧化物的电子状态并产生更多的氧缺陷，从而有效地提高了ORR / OER'的活性。NiCo ₂ S ₄和RGO之间的强协同作用进一步促进了固有的氧反应过程。不出所料，NiCo ₂ S ₄/ RGO双功能催化剂表现出增强的ORR / OER活性（ΔE：0.91 V）和稳定性，以及高电池性能（262.6 mW cm ^-2和750焦炭放电循环）。这项工作开启了硫化物在可充电锌空气电池中的广阔应用前景。