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May 29, 2026Hosokawa Powder Technology Foundation ANNUAL REPORT0 citationsOpen Access

Design of High-Entropy Alloy Nanoparticles and Exploration of Novel Catalytic Functions

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KMKohsuke Mori

Key Points

  • The aim is to design high-entropy alloy (HEA) nanoparticles and explore their novel catalytic functions.
  • Utilized rod-shaped CeO2 for hydrogen spillover to reduce Co2+, Ni2+, Cu2+, Zn2+, and Pd2+ ions simultaneously.
  • Developed HEA sub-nanoclusters below 1 nm using a specific oxidizing environment.
  • Created HEA@Rh nanoparticles through galvanic displacement for enhanced catalytic activity.
  • HEA sub-nanoclusters showed significantly improved catalytic activity compared to single-metal Pd nanoparticles in NO reduction.
  • Distinct oxidation-reduction responsiveness correlated with reversible structural changes under NO/H2 conditions was observed.
  • Developed HEA@Rh nanoparticles exhibited further increased catalytic activity due to controlled noble metal composition.

Abstract

還元性の高い(110)面を優先的に露出したロッド状CeO2の水素スピルオーバーを利用することで，還元電位の異なるCo2+，Ni2+，Cu2+，Zn2+，Pd2+イオンを同時還元し，1 nm以下のHEAサブナノクラスターが形成された．NO還元反応にてCeO2ロッド上のHEAサブナノクラスターは単金属Pdナノ粒子触媒よりも飛躍的に活性が向上した．また，NO/H2流通下で単金属Pdナノ粒子とは異なる特異な酸化還元応答性に伴う可逆的な構造変化を示した．さらにガルバニック置換を施しナノ粒子表面における貴金属組成の制御を行うことでHEAをコア，Rhをシェルに持つHEA@Rhナノ粒子担持触媒を開発し，更なる触媒活性の向上に成功した．

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Cite This Study

Kohsuke Mori (2026) studied this question.

synapsesocial.com/papers/6a192cb4fab5b468c441584ehttps://doi.org/10.14356/hptf.23116
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