Skeletal octahedral nanoframe with cartesian coordinates via geometrically precise nanoscale phase segregation in a Pt@Ni core-shell nanocrystal

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Title
Skeletal octahedral nanoframe with cartesian coordinates via geometrically precise nanoscale phase segregation in a Pt@Ni core-shell nanocrystal
Author(s)
Aram Oh; Hionsuck Baik; Dong Shin Choi; Jae Yeong Cheon; Byeongyoon Kim; Heejin Kim; Seong Jung Kwon; Sang Hoon Joo; Yousung Jung; Kwangyeol Lee
Publication Date
2015-03
Journal
ACS NANO, v.9, no.3, pp.2856 - 2867
Publisher
AMER CHEMICAL SOC
Abstract
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 〈100〉 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. © 2015 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/2094
ISSN
1936-0851
Appears in Collections:
Center for Molecular Spectroscopy and Dynamics(분자 분광학 및 동력학 연구단) > Journal Papers (저널논문)
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