In this study, metal-organic frameworks (MOFs) derived cobalt encapsulated in porous nitrogen-doped carbon (Co/N–C) nanocomposite electrocatalyst is developed towards the highly efficient and durable oxygen reduction reaction (ORR) via pyrolysis of core-shell MOFs precursor. Electrochemical characterization results indicate that the as-prepared Co/N–C nanocomposite shows superior ORR selectivity through a four-electron pathway and extraordinary long-term stability. The uniform nitrogen dopants on the surface of the polyhedron are determined and deconvoluted by the X-ray photoelectron spectroscopy (XPS). We contribute this superior catalytic activity to the characteristic attributes of Co/N–C nanocomposite, which could be stemmed from its exquisite catalyst design: (i) the existence of Co/N-doped carbon nanotubes nanostructure on the catalyst surface and (ii) the proper nitrogen content on the N-doped carbon (N–C) layer. Moreover, Co/N–C nanocomposite presents favorable long-term catalytic stability for 60 h, owning to the protective effect of the porous N–C layer. The present work demonstrates that the MOFs-derived nanomaterial can be transformed into high-value functional transition metal/N-doped carbon nanocomposite electrocatalysts. From both the stability and activity prospects, our work opens a new avenue to strategically design highly active and stable-oriented electrocatalysts.

在这项研究中，金属-有机骨架（MOF）衍生自封装在多孔氮掺杂碳（Co / N–C）纳米复合电催化剂中的钴，旨在通过核-壳MOF的热解实现高效，持久的氧还原反应（ORR）。前体。电化学表征结果表明，所制备的Co / N–C纳米复合材料通过四电子途径显示出优异的ORR选择性，并具有出色的长期稳定性。通过X射线光电子能谱（XPS）确定多面体表面均匀的氮掺杂剂并对其进行去卷积。我们将这种优异的催化活性归功于Co / NC纳米复合材料的特性，这可以归因于其精美的催化剂设计：（i）催化剂表面存在Co / N掺杂的碳纳米管纳米结构，以及（ii）N掺杂的碳（NC）层上适当的氮含量。此外，Co / NC纳米复合材料具有良好的长期催化稳定性，可持续60 h，这要归功于多孔NC层的保护作用。本工作表明，MOF衍生的纳米材料可以转化为高价值的功能过渡金属/ N掺杂的碳纳米复合电催化剂。从稳定性和活性的前景来看，我们的工作为战略性设计高活性和稳定取向的电催化剂开辟了一条新途径。本工作表明，MOF衍生的纳米材料可以转化为高价值的功能过渡金属/ N掺杂的碳纳米复合电催化剂。从稳定性和活性的前景来看，我们的工作为战略性设计高活性和稳定取向的电催化剂开辟了一条新途径。本工作表明，MOF衍生的纳米材料可以转化为高价值的功能过渡金属/ N掺杂的碳纳米复合电催化剂。从稳定性和活性的前景来看，我们的工作为战略性设计高活性和稳定取向的电催化剂开辟了一条新途径。