N-Doped carbon nanospheres with nanocavities to encapsulate manganese oxides as ORR electrocatalysts,New Journal of Chemistry

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N-Doped carbon nanospheres with nanocavities to encapsulate manganese oxides as ORR electrocatalysts
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2020-08-03 , DOI: 10.1039/d0nj03056b
Minggui Wang _{1,

2,

3,

4,

5} , Fang Peng _{1,

2,

3,

4} , Min Wang _{1,

2,

3,

4} , Jie Han _{2,

3,

4,

5}

Affiliation

Herein we report a facile strategy to embed manganese oxide (MnO_X) nanoparticles into nanocavities of N-doped carbon nanospheres (N-CNs). N-CNs were first synthesized through polymerization of pyrrole and self-assembly of polypyrrole with silica nanospheres as a template, followed by pyrolysis treatment and silica template removal. The addition of KMnO₄ to N-CNs resulted in the formation of N-CNs@MnO₂ hybrids. After calcination of the N-CN@MnO₂ hybrids at temperatures of 100 °C, 300 °C and 500 °C, the crystalline phase of manganese oxides can be transformed from MnO₂ into Mn₃O₄ and MnO. The N-CN@MnO_X hybrids were characterized by SEM, TEM, HRTEM, XRD, Raman, XPS and nitrogen adsorption–desorption techniques. Finally, N-CN@MnO_X hybrids were used as electrocatalysts toward the oxygen reduction reaction (ORR). The results indicated that N-CN@Mn₃O₄ hybrids exhibited the best ORR performance and superior electrocatalytic stability.

中文翻译：

具有纳米腔的N掺杂碳纳米球可封装氧化锰作为ORR电催化剂

本文中，我们报告了一种将锰氧化物（MnO _X）纳米粒子嵌入N掺杂碳纳米球（N-CN）纳米腔中的简便策略。N-CNs首先通过吡咯的聚合和聚吡咯的自组装以二氧化硅纳米球为模板合成，然后进行热解处理并除去二氧化硅模板。向N-CN中添加KMnO ₄导致形成N-CNs @ MnO ₂杂化物。在100°C，300°C和500°C的温度下煅烧N-CN @ MnO ₂杂化物后，锰氧化物的晶相可以从MnO ₂转变为Mn ₃ O ₄和MnO。N-CN @ MnO _X通过SEM，TEM，HRTEM，XRD，拉曼，XPS和氮吸附-解吸技术对杂种进行了表征。最后，将N-CN @ MnO _X杂化物用作氧还原反应（ORR）的电催化剂。结果表明，N-CN @ Mn ₃ O ₄杂化体表现出最佳的ORR性能和优异的电催化稳定性。

更新日期：2020-08-21

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