Publication
Title
Three-dimensional quantification of the facet evolution of Pt nanoparticles in a variable gaseous environment
Author
Abstract
Pt nanoparticles play an essential role in a wide variety of catalytic reactions. The activity of the particles strongly depends on their three-dimensional (3D) structure and exposed facets, as well as on the reactive environment. High-resolution electron microscopy has often been used to characterize nanoparticle catalysts but unfortunately most observations so far have been either performed in vacuum and/or using conventional (2D) in situ microscopy. The latter however does not provide direct 3D morphological information. We have implemented a quantitative methodology to measure variations of the 3D atomic structure of nanoparticles under the flow of a selected gas. We were thereby able to quantify refaceting of Pt nanoparticles with atomic resolution during various oxidationreduction cycles. In a H2 environment, a more faceted surface morphology of the particles was observed with {100} and {111} planes being dominant. On the other hand, in O2 the percentage of {100} and {111} facets decreased and a significant increase of higher order facets was found, resulting in a more rounded morphology. This methodology opens up new opportunities toward in situ characterization of catalytic nanoparticles because for the first time it enables one to directly measure 3D morphology variations at the atomic scale in a specific gaseous reaction environment.
Language
English
Source (journal)
Nano letters / American Chemical Society. - Washington
Publication
Washington : 2019
ISSN
1530-6984
DOI
10.1021/ACS.NANOLETT.8B04303
Volume/pages
19 :1 (2019) , p. 477-481
ISI
000455561300061
Pubmed ID
30540912
Full text (Publisher's DOI)
Full text (open access)
UAntwerpen
Faculty/Department
Research group
Project info
Picometer metrology for light-element nanostructures: making every electron count (PICOMETRICS).
Colouring Atoms in 3 Dimensions (COLOURATOM).
European infrastructure for spectroscopy, scattering and imaging of soft matteer (EUSMI).
Multiscale, Multimodal and Multidimensional imaging for Engineering (Mummering).
Bringing light atoms to light: precise characterization of light-atom nanostructures using transmission electron microscopy.
Complex hetero-nanosystems: three-dimensional characterisation down to the atomic scale.
Three-dimensional atomic modelling of functional nanocrystalline structures from a single viewing direction.
Understanding and optimization of the property-structure connection of Lanthanide doped luminescent nanoparticles through advanced transmission electron microscopy.
PEGASUS-2: [PEGASUS]², giving wings to your career
Smart strategies to break the beam damage limits in transmission electron microscopy.
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identifier
Creation 21.01.2019
Last edited 02.10.2024
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