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Correlating 3D Surface Atomic Structure and Catalytic Activities of Pt Nanocrystals

Title
Correlating 3D Surface Atomic Structure and Catalytic Activities of Pt Nanocrystals
Authors
Kim, SunginKwag, JiminMachello, ChiaraKang, SungsuHeo, JunyoungReboul, Cyril F.Kang, DohunKang, SeulkiShim, SangdeokPark, So-JungKim, Byung HyoHyeon, TaeghwanErcius, PeterElmlund, HansPark, Jungwon
Ewha Authors
박소정
SCOPUS Author ID
박소정scopus
Issue Date
2021
Journal Title
NANO LETTERS
ISSN
1530-6984JCR Link

1530-6992JCR Link
Citation
NANO LETTERS vol. 21, no. 2, pp. 1175 - 1183
Keywords
Surface atomic structure3D coordination map3D atomic structureSurface coordination numberStructure-catalytic activity relationshipNanocrystal imaging
Publisher
AMER CHEMICAL SOC
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
Active sites and catalytic activity of heterogeneous catalysts is determined by their surface atomic structures. However, probing the surface structure at an atomic resolution is difficult, especially for solution ensembles of catalytic nanocrystals, which consist of heterogeneous particles with irregular shapes and surfaces. Here, we constructed 3D maps of the coordination number (CN) and generalized CN ((CN) over bar) for individual surface atoms of sub-3 nm Pt nanocrystals. Our results reveal that the synthesized Pt nanocrystals are enclosed by islands of atoms with nonuniform shapes that lead to complex surface structures, including a high ratio of low-coordination surface atoms, reduced domain size of low-index facets, and various types of exposed high-index facets. 3D maps of (CN) over bar are directly correlated to catalytic activities assigned to individual surface atoms with distinct local coordination structures, which explains the origin of high catalytic performance of small Pt nanocrystals in important reactions such as oxygen reduction reactions and CO electro-oxidation.
DOI
10.1021/acs.nanolett.0c04873
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자연과학대학 > 화학·나노과학전공 > Journal papers
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