The lithium-oxygen batteries (LOBs) have gained extensive interest in the past decade, but are plagued by slow reaction kinetics and induced large-voltage hysteresis. Therefore, developing extremely capable catalysts to enhance catalytic behavior and mitigate oxidation-reduction overpotential of LOBs is of huge challenge and significance. Attributable to their economically friendly and great activity, transition metal oxides (TMO) have incurred lots of attention as alternative electrocatalysts to replace the currently used noble metal-based catalysts. In this work, we fabricate a highly efficient TMO (the MIL-88A heated at 500 °C under protective flow, M8-Fe₃O₄@NC-500) electrocatalyst as advanced cathodes, which attributed to its unique structure, numerous dendritic-shaped carbon layer was anchored inplane into the micrometer-long spindle-shaped prisms with evenly distribution and contains abundant Fe–N/Graphitic N active sites. Therefore, the LOBs (based on M8-Fe₃O₄@NC-500/AB cathode) deliver superior electrochemical performance with large specific capacities of 14866.1 mAh g⁻¹, low overpotentials (1.31 V), and steady cycling stability (553 cycles, limited 500 mAh g⁻¹, under 0.05 mA cm⁻²). Our work provides a novel vision to rationally design and synthesize a powerful TMO electrocatalyst (with the 2D carbon nanosheet coating) for the LOBs cathode.

锂氧电池（LOB）在过去十年中引起了广泛的兴趣，但受到反应动力学缓慢和感应大电压滞后的困扰。因此，开发极其强大的催化剂以增强催化行为并减轻 LOB 的氧化还原过电位具有巨大的挑战和意义。由于其经济友好且活性高，过渡金属氧化物 (TMO) 作为替代电催化剂以取代目前使用的贵金属基催化剂而备受关注。在这项工作中，我们制造了一种高效的 TMO（MIL-88A 在保护流下加热到 500°C，M8-Fe ₃ O ₄@NC-500) 作为先进阴极的电催化剂，由于其独特的结构，许多树枝状碳层被固定在面内均匀分布的微米长纺锤形棱柱中，并含有丰富的 Fe-N/石墨 N 活性位点。因此，LOB（基于 M8-Fe ₃ O ₄ @NC-500/AB 正极）具有优异的电化学性能，具有 14866.1 mAh g ^-1的大比容量、低过电位（1.31 V）和稳定的循环稳定性（553 次循环） ，限制为 500 mAh g ^-1，低于 0.05 mA cm ^-2）。我们的工作为合理设计和合成用于 LOBs 阴极的强大 TMO 电催化剂（具有二维碳纳米片涂层）提供了新的愿景。