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

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Title
Correlating 3D Surface Atomic Structure and Catalytic Activities of Pt Nanocrystals
Author(s)
Sungin Kim; Kwag, Jimin; Machello, Chiara; Sungsu Kang; Junyoung Heo; Reboul, Cyril F.; Kang, Dohun; Kang, Seulki; Shim, Sangdeok; Park, So-Jung; Byung Hyo Kim; Taeghwan Hyeon; Ercius, Peter; Elmlund, Hans; Jungwon Park
Publication Date
2021-01
Journal
NANO LETTERS, v.21, no.2, pp.1175 - 1183
Publisher
AMER CHEMICAL SOC
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.
URI
https://pr.ibs.re.kr/handle/8788114/9869
DOI
10.1021/acs.nanolett.0c04873
ISSN
1530-6984
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > 1. Journal Papers (저널논문)
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