FeCo nanoalloys embedded in nitrogen-doped carbon nanosheets/bamboo-like carbon nanotubes for the oxygen reduction reaction,Inorganic Chemistry Frontiers

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FeCo nanoalloys embedded in nitrogen-doped carbon nanosheets/bamboo-like carbon nanotubes for the oxygen reduction reaction
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2020-10-22 , DOI: 10.1039/d0qi01037e
Xiao-Wei Song _{1,

2,

3,

4,

5} , Shuwei Zhang _{1,

2,

3,

4,

5} , Haihong Zhong _{1,

2,

3,

4,

5} , Yuan Gao _{1,

2,

3,

4,

5} , Luis A. Estudillo-Wong _{6,

7,

8,

9,

10} , Nicolas Alonso-Vante _{11,

12,

13,

14,

15} , Xin Shu _{1,

2,

3,

4,

5} , Yongjun Feng _{1,

2,

3,

4,

5}

Affiliation

Herein, FeCo bimetallic organic frameworks (MOFs) with different compositions were fabricated by controlling the initial molar ratio of Fe³⁺/Co²⁺ ions. Through a one-step carbonization treatment of FeCo MOFs and the melamine mixture, a series of FeCo nanoalloys encapsulated in bamboo-like N-doped carbon nanotubes (CNTs), entangled with N-doped carbon nanosheet nanocomposites (Fe_xCo_y–N–C), were prepared. The Fe_xCo_y–N–C materials presented an excellent ORR performance in alkaline medium. X-ray photoelectron spectroscopy (XPS) studies revealed the existence of ORR-active centers, such as Co–N_x, pyridinic-N and graphitic-N, which were responsible for the enhanced ORR activity. Besides, the synergistic coupling between FeCo alloy and N-doped carbon nanotubes favors the enhancement of the electrocatalytic performance. Among Fe_xCo_y–N–C electrocatalysts, the optimized Fe₁Co₃–N–C and Fe₃Co₁–N–C catalysts showed higher ORR performance. In addition, both Fe₁Co₃–N–C and Fe₃Co₁–N–C showed superior stability compared to the benchmark commercial Pt/C catalyst.

中文翻译：

嵌入氮掺杂碳纳米片/类竹碳纳米管中的FeCo纳米合金用于氧还原反应

本文中，通过控制Fe ³⁺ / Co ²⁺离子的初始摩尔比，制备了具有不同组成的FeCo双金属有机骨架（MOF）。通过FeCo MOF和三聚氰胺混合物的一步碳化处理，一系列包裹在竹状N掺杂碳纳米管（CNT）中的FeCo纳米合金与N掺杂碳纳米片纳米复合材料缠结在一起（Fe _x Co _y –N– C），准备。Fe _x Co _y –N–C材料在碱性介质中具有出色的ORR性能。X射线光电子能谱（XPS）研究表明存在ORR活性中心，例如Co–N _x，吡啶-N和石墨-N负责增强ORR活性。此外，FeCo合金与N掺杂碳纳米管之间的协同偶联有利于增强电催化性能。在Fe _x Co _y –N–C电催化剂中，经过优化的Fe ₁ Co ₃ –N–C和Fe ₃ Co ₁ –N–C催化剂显示出更高的ORR性能。此外，与基准商用Pt / C催化剂相比，Fe ₁ Co ₃ -NC和Fe ₃ Co ₁ -NC均显示出优异的稳定性。

更新日期：2020-11-06

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