Abstract Although Fe–N/C catalysts have received increasing attention in recent years for oxygen reduction reaction (ORR), it is still challenging to precisely control the active sites during the preparation. Herein, we report Fe x N@RGO catalysts with the size of 2–6 nm derived from the pyrolysis of graphene oxide and 1,1′-diacetylferrocene as C and Fe precursors under the NH3/Ar atmosphere as N source. The 1,1′-diacetylferrocene transforms to Fe3O4 at 600°C and transforms to Fe3N and Fe2N at 700°C and 800°C, respectively. The as-prepared Fe x N@RGO catalysts exhibited superior electrocatalytic activities in acidic and alkaline media compared with the commercial 10% Pt/C, in terms of electrochemical surface area, onset potential, half-wave potential, number of electrons transferred, kinetic current density, and exchange current density. In addition, the stability of FGN-8 also outperformed commercial 10% Pt/C after 10000 cycles, which demonstrates the as-prepared Fe x N@RGO as durable and active ORR catalysts in acidic media.

中文翻译：

---

源自 1,1'-二乙酰二茂铁的高级 FexN 电催化剂用于碱性和酸性介质中的氧还原反应

摘要 尽管近年来 Fe-N/C 催化剂在氧还原反应 (ORR) 方面受到越来越多的关注，但在制备过程中精确控制活性位点仍然具有挑战性。在此，我们报告了尺寸为 2-6 nm 的 Fe x N@RGO 催化剂，其源自氧化石墨烯和 1,1'-二乙酰二茂铁作为 C 和 Fe 前体在 NH3/Ar 气氛下作为 N 源的热解。1,1'-二乙酰二茂铁在 600°C 时转化为 Fe3O4，在 700°C 和 800°C 时分别转化为 Fe3N 和 Fe2N。与商用 10% Pt/C 相比，所制备的 Fe x N@RGO 催化剂在酸性和碱性介质中表现出优异的电催化活性，包括电化学表面积、起始电位、半波电位、转移的电子数、动力学电流密度和交换电流密度。