Understanding the relationship between composition and activity is essential for the rational design of metal‐nitrogen‐Carbon (M−N−C) electrocatalysts for the oxygen reduction reaction (ORR). Here, a series of Fe‐N co‐doped porous carbon (Fe‐N−C) electrocatalysts are successfully prepared through the pyrolysis of ZIF‐8 doped with different amount of hemin. The catalyst (Fe₅₅‐N−C) exhibits impressive ORR performance with an onset potential (E_onset) of 1.02 V (vs. RHE) and a half‐wave potential (E_1/2) of 0.892 V in alkaline media, outperforming commercial Pt/C. Meanwhile, the average kinetic current density (J_k) of Fe₅₅‐N−C at 0.850 V is 17.5 mA cm⁻², which is 3.3‐fold higher than that of commercial Pt/C. Besides, it also delivers anti‐methanol poisoning ability and high durability. The high performance stems from the hierarchical porous structure, large specific surface area, and high dispersion of Fe‐N_x active sites in Fe₅₅‐N−C. These findings could inspire new perspectives for rationally designing and synthesizing economical and practical non‐precious‐metal oxygen reduction electrocatalysts.

中文翻译：

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具有可调组成的铁氮共掺杂碳作为高效的氧还原电催化剂

理解组成和活性之间的关系对于合理设计用于氧还原反应（ORR）的金属-氮-碳（MC）电催化剂至关重要。在这里，通过掺杂不同量的血红素的ZIF-8的热解成功制备了一系列Fe-N共掺杂的多孔碳（Fe-N-C）电催化剂。催化剂（Fe _{55 ‐} N-C）表现出令人印象深刻的ORR性能，在碱性介质中的起始电势（E _start）为1.02 V（vs. RHE），半波电势（E _1/2）为0.892V。商业Pt / C。同时，Fe ₅₅ ‐N-C在0.850 V时的平均动电流密度（J _k）为17.5 mA cm ^-2，这是商用Pt / C的3.3倍。此外，它还具有抗甲醇中毒的能力和高耐用性。高性能源自分层的多孔结构，较大的比表面积以及Fe-N _x活性位在Fe ₅₅ -N-C中的高度分散。这些发现可能会为合理设计和合成经济实用的非贵金属氧还原电催化剂提供新的见解。