Herein, we report the in situ synthesis of poly (ferrocene-urea) (PFUA) by reacting ferrocene diacylazide and tris (4-aminophenyl) amine. The formation of urea linkages between the precursors was confirmed by Fourier transform Infrared (FTIR) spectroscopy. The synthesized PFUA was pyrolyzed at different temperatures under Argon atmosphere to obtain hematite at 600 °C and magnetite embedded N-doped carbons at 800 and 1000 °C. Both hematite and magnetite was found to have particulate morphology embedded on porous N-doped carbon. The N-doping into the carbon matrix was confirmed by X-ray photoelectron spectroscopy (XPS). Further, their electrocatalytic activity towards oxygen reduction reaction (ORR) was carried out under standard conditions. PFUA pyrolyzed at 800 °C was found to exhibit better ORR activity than the other samples. The improved electrocatalytic activity toward ORR can be ascribed to the reductive environment generated during the thermal treatment of the urea linkages (formed between FDA and TAPA) which controls the structural transformation of the hematite phase to magnetite phase of iron oxide with creation of oxygen vacancies with improved Fe²⁺ to Fe³⁺ ratio.

在此，我们报告原位通过二茂铁二酰肼和三（4-氨基苯基）胺反应合成聚（二茂铁-脲）（PFUA）。通过傅里叶变换红外 (FTIR) 光谱证实了前体之间尿素键的形成。合成的 PFUA 在氩气气氛下在不同温度下热解得到赤铁矿在 600 °C 和磁铁矿嵌入 N 掺杂碳在 800 和 1000 °C。发现赤铁矿和磁铁矿都具有嵌入多孔 N 掺杂碳上的颗粒形态。通过 X 射线光电子能谱 (XPS) 证实了碳基质中的 N 掺杂。此外，它们对氧还原反应（ORR）的电催化活性是在标准条件下进行的。发现在 800°C 下热解的 PFUA 表现出比其他样品更好的 ORR 活性。²⁺与 Fe ^{3+ 的}比率。