Issue 47, 2023

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

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.

Graphical abstract: Support-facet-dependent morphology of small Pt particles on ceria

Supplementary files

Article information

Article type
Paper
Submitted
18 Sept. 2023
Accepted
31 Okt. 2023
First published
02 Nov. 2023
This article is Open Access
Creative Commons BY-NC license

Nanoscale, 2023,15, 19091-19098

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

H. Eliasson, Y. Niu, R. E. Palmer, H. Grönbeck and R. Erni, Nanoscale, 2023, 15, 19091 DOI: 10.1039/D3NR04701F

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