Denary High-Entropy Oxide Nanoparticles Synthesized by a Continuous Supercritical Hydrothermal Flow Process

IR (HANDLE) Open Access
  • Hanabata, Shota
    Division of Chemistry, Graduate School of Science, Kyoto University
  • Kusada, Kohei
    Division of Chemistry, Graduate School of Science, Kyoto University; The HAKUBI Center for Advanced Research, Kyoto University
  • Yamamoto, Tomokazu
    The Ultramicroscopy Research Center, Kyushu University
  • Toriyama, Takaaki
    The Ultramicroscopy Research Center, Kyushu University
  • Matsumura, Syo
    The Ultramicroscopy Research Center, Kyushu University; Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University
  • Kawaguchi, Shogo
    Center for Synchrotron Radiation Research, Japan Synchrotron Radiation Research Institute (JASRI), SPring-8
  • Kubota, Yoshiki
    Department of Physics, Graduate School of Science, Osaka Metropolitan University
  • Nishida, Yoshihide
    Advanced Ceramics Research Center, Nagoya Institute of Technology
  • Haneda, Masaaki
    Advanced Ceramics Research Center, Nagoya Institute of Technology
  • Kitagawa, Hiroshi
    Division of Chemistry, Graduate School of Science, Kyoto University

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Description

High-entropy oxide nanoparticles (HEO NPs) have been intensively studied because of their attractive properties, such as high stability and enhanced catalytic activity. In this work, for the first time, denary HEO NPs were successfully synthesized using a continuous supercritical hydrothermal flow process without calcination. Interestingly, this process allows the formation of HEO NPs on the order of seconds at a relatively lower temperature. The synthesized HEO NPs contained 10 metal elements, La, Ca, Sr, Ba, Fe, Mn, Co, Ru, Pd, and Ir, and had a perovskite-type structure. Atomic-resolution high-angle annular dark-field scanning transmission electron microscopy and energy-dispersive X-ray spectroscopy measurements revealed homogeneous dispersion of the 10 metal elements. The obtained HEO NPs also exhibited a higher catalytic activity for the CO oxidation reaction than that of the LaFeO₃ NPs.

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Details 詳細情報について

  • CRID
    1050017345552242944
  • ISSN
    15205126
    00027863
  • HANDLE
    2433/286580
  • Text Lang
    en
  • Article Type
    journal article
  • Data Source
    • IRDB

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