Deflagration synthesis of nitrogen/fluorine co-doped hollow carbon nanoparticles with excellent oxygen reduction performance†,Inorganic Chemistry Frontiers

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Deflagration synthesis of nitrogen/fluorine co-doped hollow carbon nanoparticles with excellent oxygen reduction performance†
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2018-04-05 00:00:00 , DOI: 10.1039/c8qi00200b
Yousong Liu _{1,

2,

3,

4} , Bing Huang _{1,

2,

3,

4} , Shengjie Peng _{4,

5,

6,

7,

8} , Tao Wang _{4,

5,

6,

7} , Guangbin Ji _{4,

5,

6,

7} , Guangcheng Yang _{1,

2,

3,

4} , Seeram Ramakrishna _{8,

9,

10}

Affiliation

Critical factors such as doping content, electronic conductivity and porosity need to be addressed to obtain excellent oxygen reduction reaction (ORR) performance with metal-free carbon-based materials. However, creating a facile approach to obtain carbon materials with a high doping level, high graphitization degree and high surface area still remains a great challenge. In this work, we develop a NaN₃/C₅F₅N deflagration method to synthesize high N/F co-doped carbon hollow nanospheres (N/F-HC) with a high graphitization degree. The deflagration of NaN₃ can produce Na nanoclusters, which can not only capture partial F atoms from C₅F₅N but can also be used as templates for the formation of a hollow structure. The heat liberation from deflagration and the subsequent F-capturing reaction could generate an extremely high temperature for graphitic structure formation. Moreover, the ultra-fast deflagration and F-capturing reaction allow carbon growth to be completed in seconds, which can ensure a high N/F doping content. The optimized N/F-HC catalyst exhibits superior ORR performance with long-term stability compared to a commercial Pt/C electrocatalyst in an alkaline medium. The synthetic strategy described in this work is facile and is expected to underpin future research efforts to develop metal-free electrocatalysts for the ORR and other applications.

中文翻译：

具有优异的氧还原性能的氮/氟共掺杂空心碳纳米粒子的爆燃合成†

需要解决诸如掺杂含量，电子电导率和孔隙率之类的关键因素，以利用不含金属的碳基材料获得出色的氧还原反应（ORR）性能。然而，创造一种容易的方法来获得具有高掺杂水平，高石墨化度和高表面积的碳材料仍然是巨大的挑战。在这项工作中，我们开发了一种NaN ₃ / C ₅ F ₅ N爆燃方法，以合成具有高石墨化度的高N / F共掺杂碳空心纳米球（N / F-HC）。NaN ₃的爆燃可以产生Na纳米团簇，这些团簇不仅可以捕获C ₅ F _5中的部分F原子N，但也可用作形成空心结构的模板。爆燃和随后的F俘获反应释放出的热量可能会为石墨结构的形成产生极高的温度。而且，超快的爆燃和F捕获反应使碳的生长在几秒钟内完成，这可以确保高的N / F掺杂含量。经过优化的N / F-HC催化剂与碱性介质中的商用Pt / C电催化剂相比，具有优异的ORR性能和长期稳定性。这项工作中描述的合成策略是可行的，并且有望为开发用于ORR和其他应用的无金属电催化剂的未来研究工作提供基础。

更新日期：2018-04-05

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