In recent years, Fe–N–C materials have been considered as feasible substitutes for platinum-based catalysts to enhance the oxygen reduction reaction (ORR). However, Fe–N–C catalysts still have specific problems, including poor inherent activity, restricted availability of active sites, and inferior stability. This work presents a simple and efficient method for synthesizing Fe/N codoped hierarchical porous carbon nanosheets using one-step pyrolysis. The optimized Fe–N–C 900 catalyst exhibits excellent ORR performance with an onset potential of 0.958 V and half-potentials of 0.885 V in an alkaline medium, surpassing those of the commercial Pt/C catalyst. In addition, the optimal catalyst demonstrated improved stability and great resistance to methanol. Furthermore, the zinc-air battery constructed from Fe–N–C 900 shows a remarkable power density of 163.65 mW cm^–2 and a specific capacity of 807.80 mA h g_Zn^–1. The electrochemical stability and cycle stability were proven to exceed 400 h at a current density of 5 mA cm^–2. This study offers valuable insights for the development of highly efficient and stable ORR catalysts in the clean energy field.

中文翻译：

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多级多孔 Fe/N 共掺杂碳纳米片的制备作为锌空气电池的氧还原反应电催化剂


近年来，Fe-N-C 材料被认为是铂基催化剂的可行替代品，可增强氧还原反应 （ORR）。然而，Fe-N-C 催化剂仍然存在特定问题，包括固有活性差、活性位点可用性受限和稳定性差。本工作提出了一种使用一步热解合成 Fe/N 共掺杂多级多孔碳纳米片的简单有效的方法。优化的 Fe-N-C 900 催化剂在碱性介质中表现出优异的 ORR 性能，起始电位为 0.958 V，半电位为 0.885 V，超过了商用 Pt/C 催化剂。此外，最佳催化剂表现出更高的稳定性和对甲醇的出色耐受性。此外，由 Fe-N-C 900 构建的锌空气电池显示出 163.65 mW ^cm-2 的显着功率密度和 807.80 mA h g_Zn-1 的比容量。电化学稳定性和循环稳定性被证明在 5 mA cm^–2 的电流密度下超过 400 h。本研究为清洁能源领域高效、稳定的 ORR 催化剂的开发提供了有价值的见解。