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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Ni@Pt core-shell nanoparticles: Synthesis, structural and electrochemical properties
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Ni@Pt core-shell nanoparticles: Synthesis, structural and electrochemical properties

机译：Ni @ Pt核壳纳米粒子：合成，结构和电化学性质

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摘要

Core-shell nanoparticles composed of a nonnoble metal core and a noble metal shell are of great significance in many areas including chemical catalysis, optical detection, and magnetic separation. Through a modification of the commonly used polyol process, Ni@Pt core-shell nanoparticles that are less than 10 nm in total size and have a very thin Pt shell can be fabricated by a sequential reduction approach. The prepared core-shell nanoparticles were characterized with TEM, XRD, molecular dynamics (MD) simulations, and electrochemical method. It was found that these core-shell particles exhibit the structural characteristics of fcc Ni nanocrystals with a slightly expanded lattice constant but the electrochemical properties of a Pt surface with a significantly shortened Pt-Pt interatomic distance than for pure Pt nanoparticles. The structural characteristics of the prepared core-shell particles revealed by the TEM, XRD, and electrochemical analyses were well verified by. MD simulations of a Ni@Pt core-shell particle with a monolayer Pt shell. It is believed that the prepared Ni@Pt core-shell nanoparticles could be promising cathode catalysts in PEM fuel cells with much reduced Pt content but significantly increased catalytic activity.
机译：由非贵金属核和贵金属壳组成的核-壳纳米粒子在包括化学催化，光学检测和磁分离在内的许多领域都具有重要意义。通过对常用的多元醇工艺进行修改，可以通过顺序还原方法制造总尺寸小于10 nm且Pt壳非常薄的Ni @ Pt核壳纳米颗粒。通过TEM，XRD，分子动力学（MD）模拟和电化学方法对制备的核-壳纳米粒子进行了表征。发现这些核-壳颗粒表现出具有略微扩展的晶格常数的fcc Ni纳米晶体的结构特征，但是与纯Pt纳米颗粒相比，具有显着缩短的Pt-Pt原子间距离的Pt表面的电化学性质。通过TEM，XRD和电化学分析揭示了所制备的核-壳颗粒的结构特征得到了很好的验证。带有单层Pt壳的Ni @ Pt核壳颗粒的MD模拟。可以认为，制备的Ni @ Pt核壳纳米粒子可能是PEM燃料电池中有希望的阴极催化剂，其Pt含量大大降低，但催化活性显着提高。

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