期刊
ACS NANO
卷 9, 期 3, 页码 2856-2867出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn5068539
关键词
platinum; nanoparticles; crystal growth; alloy; phase segregation
类别
资金
- National Research Foundation of Korea - Korea government (MSIP) [NRF-2013R1A2A2A01015168, NRF-20100020209, NRF-2014R1A4A1003712, NRF-2013R1A1A2012960]
- [IBS-R023-D1-2015-a00]
Catalytic properties of nanoparticles can be significantly enhanced by controlling nanoscale alloying and its structure. In this work, by using a facet-controlled Pt@Ni core shell octahedron nanoparticle, we show that the nanoscale phase segregation can have directionality and be geometrically controlled to produce a Ni octahedron that is penetrated by Pt atoms along three orthogonal Cartesian axes and is coated by Pt atoms along its edges. This peculiar anisotropic diffusion of Pt core atoms along the 000) vertex, and then toward the < 110 > edges, is explained via the minimum strain energy for Ni Ni pair interactions. The selective removal of the Ni-rich phase by etching then results in structurally fortified Pt-rich skeletal PtNi alloy framework nanostructures. Electrochemical evaluation of this hollow nanoframe suggests that the oxygen reduction reaction (ORR) activity is greatly improved compared to conventional Pt catalysts.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据