Hierarchical porous N-doped carbon with Fe/Fe₃C nanoparticles, high content of N dopants (10.51 wt%), and a 3D interconnected porous architecture constructed by flake-like nanostructure was facilely prepared by carbonization of a zeolitic imidazolate framework-8 (ZIF-8) as a self-sacrificing template and potassium ferricyanide (PF) as a multifunctional iron precursor. The unique porous structure can offer a continuous pathway for electron transfer and shorten the mass transfer pathway, which contribute to both an oxygen reduction reaction (ORR) and a supercapacitor. The influence of the carbonization temperature and iron content on the performance of ORR and supercapacitor was investigated. The as-prepared composites carbonized at 800 °C (Fe-CZIF-800-10) displayed comparable ORR activity with Pt/C in alkaline media as well as excellent long-term stability, superb methanol tolerance, and appreciable onset potential in acid media. Moreover, Fe-CZIF-800-10 exhibited excellent capacity of 246 F g⁻¹ at a current density of 0.5 A g⁻¹ and stability in 6 M KOH. This report provides a facile approach to prepare hierarchical porous Fe/N-doped carbon as a promising electrode material for both fuel cell and supercapacitor applications.

中文翻译：

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由片状纳米结构与Fe / Fe ₃ C构成的3D互连分层多孔N掺杂碳，可有效地进行氧还原反应和超级电容器†

Fe / Fe _3的多层多孔氮掺杂碳C纳米粒子，氮杂咪唑骨架8（ZIF-8）碳化作为自牺牲模板，可以轻松制备C纳米颗粒，高含量的N掺杂剂（10.51 wt％）和由鳞片状纳米结构构成的3D互连多孔结构。铁氰化钾（PF）作为多功能铁前体。独特的多孔结构可以为电子转移提供连续的路径，并缩短质量转移的路径，这有助于氧还原反应（ORR）和超级电容器。研究了碳化温度和铁含量对ORR和超级电容器性能的影响。制备的复合材料在800°C碳化（Fe-CZIF-800-10）在碱性介质中显示出与Pt / C相当的ORR活性，以及​​出色的长期稳定性，出色的甲醇耐受性，和在酸性介质中明显的起病潜能。此外，Fe-CZIF-800-10表现出出色的246 F g容量。^-1在0.5 A g ^-1的电流密度下和在6 M KOH中的稳定性。该报告提供了一种简便的方法来制备分层的多孔Fe / N掺杂碳，作为燃料电池和超级电容器应用中有希望的电极材料。