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

机译：使用原子有序的Ni3C纳米粒子通过CVD作为催化剂载体材料合成碳纳米纤维

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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：通过减少全新世镍，制备了多边形的原子序碳化镍（Ni3C）纳米粒子。使用所得的Ni3C纳米颗粒，在350℃的较低温度下催化化学气相沉积（CCVD）成功合成了一种新型的扭曲构型的碳纳米纤维（CNF），该温度低于400℃的下限温度。使用金属催化剂的CNF生长。基于详细的表征，新近推导了来自Ni3C的扭曲CNF的生长机理。与由Ni生长CNF相比，石墨烯层在单原子台阶边缘成核并以逐层方式生长，而多边形Ni3C纳米粒子的旋转在CNF生长过程中形成扭曲的构象。经测量，负载Pt的扭曲CNF作为聚合物电解质膜燃料电池（PEMFC）的电极催化剂，其电化学活性和性能要优于500℃下由Ni纳米颗粒生长的纯CNF的电化学活性和性能，因为特定的表面构象有助于使负载的铂更均匀。

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