Surface faceting and elemental diffusion behaviour at atomic scale for alloy nanoparticles during in situ annealing

Chi, Miaofang; Wang, Chao; Lei, Yinkai; Wang, Guofeng; Li, Dongguo; More, Karren L.; Lupini, Andrew; Allard, Lawrence F.; Markovic, Nenad M.; Stamenkovic, Vojislav R.

doi:10.1038/ncomms9925

Title: Surface faceting and elemental diffusion behaviour at atomic scale for alloy nanoparticles during in situ annealing

Journal Article · Wed Nov 18 00:00:00 EST 2015 · Nature Communications

DOI:https://doi.org/10.1038/ncomms9925· OSTI ID:1249113

Chi, Miaofang ^[1]; Wang, Chao ^[2]; Lei, Yinkai ^[3]; Wang, Guofeng ^[3]; Li, Dongguo ^[4]; More, Karren L. ^[1]; Lupini, Andrew ^[1]; Allard, Lawrence F. ^[1]; Markovic, Nenad M. ^[4]; Stamenkovic, Vojislav R. ^[4]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
John Hopkins Univ., Baltimore, MD (United States)
Univ. of Pittsburgh, Pittsburgh, PA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

The catalytic performance of nanoparticles is primarily determined by the precise nature of the surface and near-surface atomic configurations, which can be tailored by post-synthesis annealing effectively and straightforwardly. Understanding the complete dynamic response of surface structure and chemistry to thermal treatments at the atomic scale is imperative for the rational design of catalyst nanoparticles. Here, by tracking the same individual Pt₃Co nanoparticles during in situ annealing in a scanning transmission electron microscope, we directly discern five distinct stages of surface elemental rearrangements in Pt₃Co nanoparticles at the atomic scale: initial random (alloy) elemental distribution; surface platinum-skin-layer formation; nucleation of structurally ordered domains; ordered framework development and, finally, initiation of amorphization. Furthermore, a comprehensive interplay among phase evolution, surface faceting and elemental inter-diffusion is revealed, and supported by atomistic simulations. In conlcusion, this work may pave the way towards designing catalysts through post-synthesis annealing for optimized catalytic performance.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357; AC05-00OR22725

OSTI ID:: 1249113

Alternate ID(s):: OSTI ID: 1271885

Journal Information:: Nature Communications, Vol. 6, Issue 8925; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 142 works

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