Atomic Reconstruction and Oxygen Evolution Reaction of Mn3O4Nanoparticles

Sangmoon Yoon, Hongmin Seo, Kyoungsuk Jin, Hyoung Gyun Kim, Seung Yong Lee, Janghyun Jo, Kang Hee Cho, Jinseok Ryu, Aram Yoon, Young Woon Kim, Jian Min Zuo, Young Kyun Kwon, Ki Tae Nam, Miyoung Kim

Research output: Contribution to journalArticlepeer-review

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 Mn3O4nanoparticles. We image surface structures of Mn3O4nanoparticles 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.

Original languageEnglish
Pages (from-to)8336-8343
Number of pages8
JournalJournal of Physical Chemistry Letters
Volume13
Issue number35
DOIs
Publication statusPublished - 2022 Sep 8

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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