Journal
ACS NANO
Volume 9, Issue 3, Pages 2856-2867Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn5068539
Keywords
platinum; nanoparticles; crystal growth; alloy; phase segregation
Categories
Funding
- National Research Foundation of Korea - Korea government (MSIP) [NRF-2013R1A2A2A01015168, NRF-20100020209, NRF-2014R1A4A1003712, NRF-2013R1A1A2012960]
- [IBS-R023-D1-2015-a00]
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available