Ni@Pt core-shell nanoparticles: Synthesis, structural and electrochemical properties
Ni@Pt core-shell nanoparticles: Synthesis, structural and electrochemical properties
复制标题
Ni@Pt核壳纳米粒子：合成、结构和电化学性能
DOI：
10.1021/jp709886y
复制
发表时间：
2008-02-07
影响因子：
3.7
通讯作者：
Chen, Shengli
中科院分区：
文献类型：
--
作者：
Chen, Yumei;Yang, Fan;Chen, Shengli
由非贵金属核和贵金属壳构成的核壳纳米粒子在化学催化、光检测、磁分离等领域具有重要意义。通过对常用的多元醇方法的改进，可以通过顺序还原方法制备总尺寸小于10 nm并且具有非常薄的Pt壳的Ni@Pt核-壳纳米颗粒。采用TEM、XRD、分子动力学模拟和电化学方法对所制备的核壳纳米粒子进行了表征。结果发现，这些核-壳粒子表现出的结构特征的fcc Ni纳米晶体的晶格常数略有扩大，但Pt表面的电化学性能与显着缩短的Pt-Pt原子间距离比纯Pt纳米粒子。通过TEM、XRD和电化学分析证实了所制备的核壳粒子的结构特征。具有单层Pt壳的Ni@Pt核-壳颗粒的MD模拟。研究表明，所制备的Ni@Pt核壳纳米粒子具有较低的Pt含量和较高的催化活性，有望成为质子交换膜燃料电池的阴极催化剂。
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.