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Atomic Reconstruction and Oxygen Evolution Reaction of Mn3O4Nanoparticles

Authors
Yoon, S.Seo, H.Jin, K.Kim, H.G.Lee, S.-Y.Jo, J.Cho, K.H.Ryu, J.Yoon, A.Kim, Y.-W.Zuo, J.-M.Kwon, Y.-K.Nam, K.T.Kim, M.
Issue Date
9월-2022
Publisher
American Chemical Society
Citation
Journal of Physical Chemistry Letters, v.13, no.35, pp.8336 - 8343
Indexed
SCIE
SCOPUS
Journal Title
Journal of Physical Chemistry Letters
Volume
13
Number
35
Start Page
8336
End Page
8343
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/144144
DOI
10.1021/acs.jpclett.2c01638
ISSN
1948-7185
Abstract
Understanding the chemical states of individual surface atoms and their arrangements is essential for addressing several current issues such as catalysis, energy stroage/conversion, and environmental protection. Here, we exploit a profile imaging technique to understand the correlation between surface atomic structures and the oxygen evolution reaction (OER) in Mn3O4 nanoparticles. We image surface structures of Mn3O4 nanoparticles and observe surface reconstructions in the (110) and (101) planes. Mn3+ ions at the surface, which are commonly considered as the active sites in OER, disappear from the reconstructed planes, whereas Mn3+ ions are still exposed at the edges of nanoparticles. Our observations suggest that surface reconstructions can deactivate low-index surfaces of Mn oxides in OER. These structural and chemical observations are further validated by density functional theory calculations. This work shows why atomic-scale characterization of surface structures is crucial for a molecular-level understanding of a chemical reaction in oxide nanoparticles. © 2022 American Chemical Society.
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