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Influence of atomic site-specific strain on catalytic activity of supported nanoparticles.

Abstract：

:Heterogeneous catalysis is an enabling technology that utilises transition metal nanoparticles (NPs) supported on oxides to promote chemical reactions. Structural mismatch at the NP-support interface generates lattice strain that could affect catalytic properties. However, detailed knowledge about strain in supported NPs remains elusive. We experimentally measure the strain at interfaces, surfaces and defects in Pt NPs supported on alumina and ceria with atomic resolution using high-precision scanning transmission electron microscopy. The largest strains are observed at the interfaces and are predominantly compressive. Atomic models of Pt NPs with experimentally measured strain distributions are used for first-principles kinetic Monte Carlo simulations of the CO oxidation reaction. The presence of only a fraction of strained surface atoms is found to affect the turnover frequency. These results provide a quantitative understanding of the relationship between strain and catalytic function and demonstrate that strain engineering can potentially be used for catalyst design.

journal_name

Nat Commun

journal_title

Nature communications

authors

Nilsson Pingel T,Jørgensen M,Yankovich AB,Grönbeck H,Olsson E

doi

10.1038/s41467-018-05055-1

subject

Has Abstract

pub_date

2018-07-13 00:00:00

pages

2722

issue

1

issn

2041-1723

pii

10.1038/s41467-018-05055-1

journal_volume

9

pub_type

杂志文章

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