Photoelectron holography characterization of protonated brownmillerite SrCoO2.5 epitaxial films

Daisuke Kan; Yusuke Hashimoto; Thanh Ngoc Pham; Lingling Xie; Yosuke Isoda; Tomohiro Matsushita; Yoshitada Morikawa; Yuichi Shimakawa

doi:10.2109/jcersj2.25062

version.2

Photoelectron holography characterization of protonated brownmillerite SrCoO_2.5 epitaxial films

Daisuke Kan, Yusuke Hashimoto, Thanh Ngoc Pham, Lingling Xie, Yosuke Isoda, Tomohiro Matsushita, Yoshitada Morikawa, Yuichi Shimakawa

Author information

Daisuke Kan
Institute for Chemical Research, Kyoto University
Yusuke Hashimoto
Graduate School of Science and Technology, Nara Institute of Science and Technology
Thanh Ngoc Pham
Department of Precision Engineering, Graduate School of Engineering, The University of Osaka
Faculty of Engineering – Technology and Environment, An Giang University (AGU)
Climate Change Institute, AGU
Vietnam National University
Lingling Xie
Institute for Chemical Research, Kyoto University
Yosuke Isoda
Institute for Chemical Research, Kyoto University
Tomohiro Matsushita
Graduate School of Science and Technology, Nara Institute of Science and Technology
Yoshitada Morikawa
Department of Precision Engineering, Graduate School of Engineering, The University of Osaka
Research Center for Precision Engineering, Graduate School of Engineering, The University of Osaka
Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (ICS-OTRI), The University of Osaka
Nanotechnology Program, Faculty of Advanced Technology and Engineering, Vietnam Japan University, Vietnam National University
Yuichi Shimakawa
Institute for Chemical Research, Kyoto University

Keywords: Photoelectron holography, Epitaxial films, Hydrogen, SrCoO_2.5

JOURNAL OPEN ACCESS Advance online publication
Supplementary material

Article ID: 25062

DOI https://doi.org/10.2109/jcersj2.25062

version.2： July 10, 2025
version.1： May 28, 2025

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Abstract

We characterized protonated SrCoO_2.5 epitaxial films by the photoelectron holography technique. We found that photoelectron holography patterns change due to cation displacements induced by electrochemical protonation. By simulating holography patterns based on structural models of the protonated SrCoO_2.5 using machine-learning enhanced global optimization and comparing them with the experimentally observed patterns, we evaluated hydrogen concentration and cation displacements in protonated SrCoO_2.5 films. Our results show that photoelectron holography is useful in characterizing protonation-induced changes in metal transition oxides.

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