Sub‐50 nm Iron–Nitrogen‐Doped Hollow Carbon Sphere‐Encapsulated Iron Carbide Nanoparticles as Efficient Oxygen Reduction Catalysts,Advanced Science

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Sub‐50 nm Iron–Nitrogen‐Doped Hollow Carbon Sphere‐Encapsulated Iron Carbide Nanoparticles as Efficient Oxygen Reduction Catalysts
Advanced Science ( IF 14.3 ) Pub Date : 2018-05-12 , DOI: 10.1002/advs.201800120
Haibo Tan _{1,

2,

3} , Yunqi Li _{1,

4} , Jeonghun Kim ₅ , Toshiaki Takei ₁ , Zhongli Wang ₁ , Xingtao Xu ₁ , Jie Wang ₁ , Yoshio Bando _{1,

6} , Yong-Mook Kang ₇ , Jing Tang ₁ , Yusuke Yamauchi _{2,

3,

5,

8}

Affiliation

Sub‐50 nm iron–nitrogen‐doped hollow carbon sphere‐encapsulated iron carbide nanoparticles (Fe₃C‐Fe,N/C) are synthesized by using a triblock copolymer of poly(styrene‐b‐2‐vinylpyridine‐b‐ethylene oxide) as a soft template. Their typical features, including a large surface area (879.5 m² g⁻¹), small hollow size (≈16 nm), and nitrogen‐doped mesoporous carbon shell, and encapsulated Fe₃C nanoparticles generate a highly active oxygen reduction reaction (ORR) performance. Fe₃C‐Fe,N/C hollow spheres exhibit an ORR performance comparable to that of commercially available 20 wt% Pt/C in alkaline electrolyte, with a similar half‐wave potential, an electron transfer number close to 4, and lower H₂O₂ yield of less than 5%. It also shows noticeable ORR catalytic activity under acidic conditions, with a high half‐wave potential of 0.714 V, which is only 59 mV lower than that of 20 wt% Pt/C. Moreover, Fe₃C‐Fe,N/C has remarkable long‐term durability and tolerance to methanol poisoning, exceeding Pt/C regardless of the electrolyte.

中文翻译：

亚 50 nm 铁氮掺杂中空碳球封装碳化铁纳米颗粒作为高效氧还原催化剂

使用聚（苯乙烯-b -2-乙烯基吡啶-b-环氧乙烷三嵌段共聚物）合成了亚50 nm铁氮掺杂中空碳球封装的碳化铁纳米颗粒（Fe ₃ C-Fe,N/C））作为软模板。它们的典型特征包括大表面积（879.5 m ² g ^-1 ）、小中空尺寸（约16 nm）和氮掺杂介孔碳壳，以及封装的Fe ₃ C纳米粒子产生高活性的氧还原反应（ORR））表现。 Fe ₃ C-Fe,N/C空心球在碱性电解液中表现出与市售20 wt% Pt/C相当的ORR性能，具有相似的半波电位、接近4的电子转移数和更低的H ₂ O ₂收率小于5%。它还在酸性条件下表现出显着的ORR催化活性，半波电位高达0.714 V，仅比20 wt% Pt/C低59 mV。此外，Fe ₃ C-Fe,N/C 具有显着的长期耐久性和对甲醇中毒的耐受性，无论电解质如何，均超过 Pt/C。

更新日期：2018-05-12

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