Fe–N co-decorated hierarchically porous graphene (FeN/G) was prepared by a facile one-step pyrolysis method. In the pyrolysis synthesis process, dicyandiamide was introduced as a nitrogen precursor and sacrificial templating agent, together with ferric nitrate utilized as an iron precursor, to aid in the formation of graphene nanosheets and their self-assembly into an interconnected porous framework. Consequently, the resultant FeN/G framework shows a relatively large specific surface area (401.1 m² g⁻¹), hierarchically porous structure and abundant meso-/macropores. Such highly desired FeNC structures not only possess sufficient catalytically active sites for the oxygen reduction reaction (ORR) but also guarantee fast transfer of reactants and ions, which provides excellent catalytic activity with positive onset and half-wave potentials, large kinetic-limiting current density, and remarkable durability that is obviously better than the commercial Pt/C in alkaline medium.

中文翻译：

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Fe-N共装饰的分层多孔石墨烯作为氧还原反应的高效电催化剂

Fe-N共装饰分层多孔石墨烯（FeN / G）是通过一种简便的一步热解方法制备的。在热解合成过程中，将双氰胺用作氮前体和牺牲模板剂，以及将硝酸铁用作铁前体，以帮助形成石墨烯纳米片并将其自组装为互连的多孔骨架。因此，所得的FeN / G骨架显示出较大的比表面积（401.1 m ² g ^-1），层次结构的多孔结构和丰富的中/大孔。这种非常需要的FeNC结构不仅具有用于氧还原反应（ORR）的足够的催化活性位点，而且还确保了反应物和离子的快速转移，从而提供了具有正发作和半波电势以及大的动力学极限电流密度的出色催化活性，并具有卓越的耐久性，在碱性介质中明显优于市售的Pt / C。