Abstract A novel kind of non-precious metal nanohybrid FeNC-900 is synthesized by hard-template with pyrolysis method using Fe-doped ZIF-8 as the precursor. The FeNC-900 has a superstructure of Fe, N co-doped carbonaceous hollow spheres crosslinked by some self-grown carbon nanotubes. The Fe, N co-doped carbonaceous matrix provides the binary electrocatalytic active sites of Fe–N–C and N-doped carbon as the electrocatalytic active sites. And the microstructure of carbonaceous hollow spheres as well as the crosslinked carbon nanotubes not only lead to the large surface area exposing the electrocatalytic active sites but also benefit the transport of the electrons and electrolyte ions and the stability of the microstructure of the nanocomposite. Thus, FeNC-900 shows the comparable electrocatalyst activities with that of state-of-the-art commercial Pt/C for ORR and RuO2 for OER respectively in both alkaline and acidic electrolytes due to the synergetic binary electrocatalytic active sites as well as the hierarchical porous texture. More importantly, the low ΔE (= E10 mA cm−2 - E-3 mA cm−2) of 0.691 and 0.784 V in 0.1 M KOH and 0.1 M HClO4 electrolytes for FeNC-900, respectively, indicating its fascinating bifunctional electrocatalytic activities for ORR and OER in both alkaline and acidic electrolytes.

中文翻译：

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Fe、N共掺杂碳质空心球与自生长碳纳米管作为高性能二元电催化剂

摘要 以Fe掺杂的ZIF-8为前驱体，采用硬模板热解法合成了一种新型非贵金属纳米杂化FeNC-900。FeNC-900 具有由一些自生碳纳米管交联的 Fe、N 共掺杂碳质空心球的超结构。Fe、N共掺杂的碳质基体提供了Fe-N-C和N掺杂碳的二元电催化活性位点作为电催化活性位点。碳质空心球和交联碳纳米管的微观结构不仅导致大表面积暴露电催化活性位点，而且有利于电子和电解质离子的传输以及纳米复合材料微观结构的稳定性。因此，由于协同的二元电催化活性位点和分级多孔结构，FeNC-900 在碱性和酸性电解质中分别显示出与最先进的商业 Pt/C 的 ORR 和 RuO2 用于 OER 的电催化剂活性相当. 更重要的是，FeNC-900 在 0.1 M KOH 和 0.1 M HClO4 电解质中分别为 0.691 和 0.784 V 的低 ΔE（= E10 mA cm-2 - E-3 mA cm-2），表明其具有迷人的双功能电催化活性。碱性和酸性电解质中的 ORR 和 OER。