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首页> 外文期刊>Materials Science and Engineering >Bimetallic Fe-Co promoting one-step growth of hierarchical nitrogen-doped carbon nanotubesanofibers for highly efficient oxygen reduction reaction
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Bimetallic Fe-Co promoting one-step growth of hierarchical nitrogen-doped carbon nanotubesanofibers for highly efficient oxygen reduction reaction

机译：双金属Fe-Co促进分层氮掺杂碳纳米管/纳米纤维的一步生长，以实现高效的氧还原反应

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摘要

Polyacrylonitrile (PAN)-based nitrogen-doped carbon nanotubesanofibers (NCNTs/NFs) are successfully synthesized by one step using electrospinning technique in combination with impregnation of FeCo-containing solutions and subsequent heat treatment process. Interestingly, individual Fe or Co nanoparticles promotes to create many big pores on the fiber surface, while bimetallic Fe-Co ones promote the growth of carbon nanotubes from the PAN-converted carbon sources to form NCNTs/NFs, during high temperature treatment in NH_3 atmosphere. Especially, the nanotubes have relatively higher density when adopting the Fe/Co ratio was 1:1. The formed FeCo-containing NCNT/NF (FeCo-NCNT/NF) materials using Fe/Co ratio of 1:1 reveals a comparable catalytic activity but a much higher stability in comparison to commercial 20% Pt/C catalyst, and after 12 h, its activity still remains about 94%. The excellent ORR properties maybe due to the high crystallinity of carbon to resist electrochemical oxidation. This kind of bimetallic FeCo-NCNT/NF materials is of great potential in fuel cells.
机译：聚丙烯腈（PAN）基的氮掺杂碳纳米管/纳米纤维（NCNTs / NFs）是通过静电纺丝技术与含FeCo溶液的浸渍和随后的热处理工艺相结合一步一步成功合成的。有趣的是，在NH_3气氛中进行高温处理时，单个的Fe或Co纳米颗粒促进在纤维表面上形成许多大孔，而双金属Fe-Co促进了PAN转换后的碳源中碳纳米管的生长，从而形成NCNTs / NFs。 。特别地，当采用Fe / Co比率为1：1时，纳米管具有相对较高的密度。 Fe / Co比为1：1的含FeCo的NCNT / NF（FeCo-NCNT / NF）材料与商用20％Pt / C催化剂相比，在12小时后显示出可比的催化活性，但稳定性更高，其活性仍保持约94％。优异的ORR性能可能归因于碳的高结晶度以抵抗电化学氧化。这种双金属FeCo-NCNT / NF材料在燃料电池中具有巨大的潜力。

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  • 来源
    《Materials Science and Engineering》 |2017年第9期|159-166|共8页
  • 作者

    Qin Liu; Shubo Cao; Yejun Qiu; Lei Zhao;

  • 作者单位

    Shenzhen Engineering Lab of Flexible Transparent Conductive Films, Department of Materials Science and Engineering, Shenzhen Graduate School, Harbin Institute of Technology, University Town, Shenzhen 518055, China;

    Shenzhen Engineering Lab of Flexible Transparent Conductive Films, Department of Materials Science and Engineering, Shenzhen Graduate School, Harbin Institute of Technology, University Town, Shenzhen 518055, China;

    Shenzhen Engineering Lab of Flexible Transparent Conductive Films, Department of Materials Science and Engineering, Shenzhen Graduate School, Harbin Institute of Technology, University Town, Shenzhen 518055, China;

    Tianjin Academy of Environmental Sciences, 17 Fukang Road, Nankai District, Tianjin 300191, China;

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