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Synthesis of carbon nanofibers by CVD as a catalyst support material using atomically ordered Ni3C nanoparticles

机译：CVD用原子排序Ni3C纳米颗粒合成CVD作为催化剂载体材料的碳纳米纤维

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摘要

Atomically ordered nickel carbide (Ni3C) nanoparticles in polygonal shapes were prepared through the reduction of nickelocene. A novel type of carbon nanofiber (CNF) with twisted conformation was synthesized successfully by catalytic chemical vapor deposition (CCVD) using the obtained Ni3C nanoparticles at a relatively low temperature of 350 degrees C, which is below the lower limit temperature of 400 degrees C for the growth of CNFs using metal catalysts. The growth mechanism of the twisted CNFs from Ni3C was freshly derived based on the detailed characterizations. Compared with the growth of CNFs from Ni, graphene layers nucleate at monoatomic step edges and grow in a layer-by-layer manner, while the rotation of the polygonal Ni3C nanoparticles fabricates the twisted conformation during the CNF growth. The electrochemical activity and performance of the twisted CNFs loaded with Pt as electrode catalysts for a polymer electrolyte membrane fuel cell (PEMFC) were measured to be better than those of straight CNFs grown from Ni nanoparticles at 500 degrees C, since the specific surface conformation helps to make the loaded Pt more homogeneous.
机译：通过减少镍烯制备多边形形状中的原子有序碳化镍（Ni3C）纳米颗粒。使用所得Ni3C纳米颗粒在350℃的相对低温下通过催化化学气相沉积（CCVD）成功地合成了一种具有扭曲构象的新型碳纳米纤维（CNF），其低于400℃的下限温度低于400℃使用金属催化剂的CNFS生长。基于详细的表征，新鲜衍生来自Ni3C的扭曲CNF的生长机制。与Ni中CNFS的生长相比，石墨烯层在甲原始步骤边缘核成核，并以逐层的方式生长，而多边形Ni3C纳米颗粒的旋转在CNF生长期间制造扭曲的构象。用Pt作为聚合物电解质膜燃料电池（PEMFC）的电极催化剂的电化学活性和性能被测量比在500℃下从Ni纳米颗粒生长的直CNF的电极催化剂，因为特定表面构象有助于使装载的PT更加均匀。

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  • 来源
    《Nanotechnology》 |2016年第50期|共8页
  • 作者

    Li Meifeng; Li Na; Shao Wei; Zhou Chungen;

  • 作者单位

    Beihang Univ Sch Mat Sci &

    Engn Xueyuan Rd 37 Beijing 100191 Peoples R China;

    Madrid Inst Adv Studies Mat Computat Alloy Design Grp Madrid 28906 Spain;

    Beihang Univ Sch Mat Sci &

    Engn Xueyuan Rd 37 Beijing 100191 Peoples R China;

    Beihang Univ Sch Mat Sci &

    Engn Xueyuan Rd 37 Beijing 100191 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 特种结构材料;
  • 关键词

    CNFs; catalyst; Ni3C; PEMFC;

    机译：CNFS;催化剂;NI3C;PEMFC;

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