Direct Observation of Three-Dimensional Atomic Structure of Twinned Metallic Nanoparticles and Their Catalytic Properties

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We determined a full 3D atomic structure of a dumbbell-shaped Pt nanoparticle formed by a coalescence of two nanoclusters using deep learning assisted atomic electron tomography. Formation of a double twin boundary was clearly observed at the interface, while substantial anisotropy and disorder were also found throughout the nanodumbbell. This suggests that the diffusion of interfacial atoms mainly governed the coalescence process, but other dynamic processes such as surface restructuring and plastic deformation were also involved. A full 3D strain tensor was clearly mapped, which allows direct calculation of the oxygen reduction reaction activity at the surface. Strong tensile strain was found at the protruded region of the nanodumbbell, which results in an improved catalytic activity on {100} facets. This work provides important clues regarding the coalescence mechanism and the relation between the atomic structure and catalytic property at the single-atom level.
Publisher
AMER CHEMICAL SOC
Issue Date
2022-01
Language
English
Article Type
Article
Citation

NANO LETTERS, v.22, no.2, pp.655 - 672

ISSN
1530-6984
DOI
10.1021/acs.nanolett.1c03773
URI
http://hdl.handle.net/10203/292074
Appears in Collection
ME-Journal Papers(저널논문)PH-Journal Papers(저널논문)
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