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Support-facet-dependent morphology of small Pt particles on ceria

Henrik Eliasson Orcid Logo, Yubiao Niu, Richard Palmer Orcid Logo, Henrik Grönbeck Orcid Logo, Rolf Erni Orcid Logo

Nanoscale, Volume: 15, Issue: 47, Pages: 19091 - 19098

Swansea University Author: Richard Palmer Orcid Logo

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DOI (Published version): 10.1039/d3nr04701f

Abstract

Direct atomic scale information on how the structure of supported nanoparticles is affected by the metal–support interaction is rare. Using scanning transmission electron microscopy, we provide direct evidence of a facet-dependent support interaction for Pt nanoparticles on CeO2, governing the dimen...

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Published in: Nanoscale
ISSN: 2040-3364 2040-3372
Published: Royal Society of Chemistry (RSC) 2023
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URI: https://cronfa.swan.ac.uk/Record/cronfa65125
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Abstract: Direct atomic scale information on how the structure of supported nanoparticles is affected by the metal–support interaction is rare. Using scanning transmission electron microscopy, we provide direct evidence of a facet-dependent support interaction for Pt nanoparticles on CeO2, governing the dimensionality of small platinum particles. Our findings indicate that particles consisting of less than ∼130 atoms prefer a 3D shape on CeO2(111) facets, while 2D raft structures are favored on CeO2(100) facets. Measurements of stationary particles on both surface facets are supplemented by time resolved measurements following a single particle with atomic resolution as it migrates from CeO2(111) to CeO2(100), undergoing a dimensionality change from 3D to 2D. The intricate transformation mechanism reveals how the 3D particle disassembles and completely wets a neighboring CeO2(100) facet. Density functional theory calculations confirm the structure-trend and reveal the thermodynamic driving force for the migration of small particles. Knowledge of the presented metal–support interactions is crucial to establish structure–function relationships in a range of applications based on supported nanostructures.
Item Description: Raw microscopy data and relaxed atomic models are available on fig share:https://figshare.com/s/b269ca52beb834f496cd.
College: Faculty of Science and Engineering
Funders: H.E.andR.E.acknowledgefundingfromtheSwissNational Science Foundation (200021_196381). H. G. acknowledges fundingfromtheSwedishResearchCouncil (2020-05191)and computational time through a SNIC grant. R. E. P. and Y.N.thanktheWelshGovernmentfortheirfinancialsupport.
Issue: 47
Start Page: 19091
End Page: 19098

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