A facile synthesis of porous N-doped carbon with hybridization of Fe3C nanoparticle-encased CNTs for an advanced oxygen reduction reaction electrocatalyst†,Inorganic Chemistry Frontiers

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A facile synthesis of porous N-doped carbon with hybridization of Fe3C nanoparticle-encased CNTs for an advanced oxygen reduction reaction electrocatalyst†
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2018-08-27 00:00:00 , DOI: 10.1039/c8qi00681d
Pingping Zhao _{1,

2,

3,

4,

5} , Hanqiu Nie _{1,

2,

3,

4} , Jiahao Yu _{1,

2,

3,

4} , Jianbo Wang _{2,

3,

4,

5} , Gongzhen Cheng _{1,

2,

3,

4}

Affiliation

A facile synthesis of N-doped porous carbon hybridized with N-doped carbon nanotubes encapsulated with Fe₃C nanoparticles (FeNC-ZIF-800) by simply annealing a mixture of metal–organic frameworks (ZIF-8), FeC₂O₄ and cyanoguanidine at 800 °C in Ar was designed. Carbon or a relatively high temperature could lead to a pure phase of Fe₃C. A certain ratio of these precursors and an appropriate carbonization temperature is crucial in the formation process of the special hierarchical structure; the addition of ZIF-8 can enhance the BET surface area and regulate the pore structure distribution to a large extent. The good conductivity, hierarchical struture and the synergistic effect between CNTs and carbon are considered to be the major reasons that result in their highly efficient performances toward the ORR. In 0.1 M KOH solution, the as-synthesized FeNC-ZIF-800 showed a half-wave potential of 0.86 V, ca. 40 mV more positive than that of 20% commercial Pt/C. In 0.5 M H₂SO₄ solution, a good onset potential of nearly 0.85 V and a half-wave potential of 0.74 V can be achieved.

中文翻译：

与Fe ₃ C纳米粒子包裹的CNT杂化，轻松合成多孔N掺杂碳，用于高级氧还原反应电催化剂†

N掺杂的多孔碳的简便合成与封装有Fe-N系掺杂的碳纳米管杂交_3个Ç纳米颗粒（FENC-ZIF-800）通过简单地进行退火的金属-有机骨架（ZIF-8），的FeCl混合物₂ Ò ₄和设计了在800°C的Ar中的氰基胍。碳或相对较高的温度可能导致Fe ₃的纯相这些前体的一定比例和适当的碳化温度对于特殊的分层结构的形成过程至关重要。ZIF-8的添加可以增加BET表面积，并在很大程度上调节孔结构的分布。良好的导电性，层次结构以及碳纳米管与碳之间的协同作用被认为是导致它们对ORR高效表现的主要原因。在0.1 M KOH溶液中，合成后的FeNC-ZIF-800的半波电势约为0.86V 。比20％商用Pt / C的正电压高40 mV。在0.5 MH ₂ SO ₄溶液中，可以实现接近0.85 V的良好启动电位和0.74 V的半波电位。

更新日期：2018-08-27

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