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Preparation and Reactivity of Gasless Nanostructured Energetic Materials
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Surface-Engineered Core-Shell High-Entropy Alloy Nanoparticles with Reversible Structure for Low-Temperature NO

Ryota Hirasawa1, Naoki Hashimoto1, Kazuki Shun1

  • 1Division of Materials and Manufacturing Science, Graduate School of Engineering, The University of Osaka, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan.

ACS Applied Materials & Interfaces
|June 8, 2026
PubMed
Summary
This summary is machine-generated.

High-entropy alloy nanoparticles (HEA NPs) with controlled surface composition show enhanced catalytic activity for NO reduction. This core-shell structure offers reversible structural changes and robust performance under harsh conditions.

Keywords:
cerium oxidecore−shell type nanoparticlesgalvanic replacementhigh-entropy alloyhydrogen spillover

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Area of Science:

  • Materials Science
  • Catalysis
  • Nanotechnology

Background:

  • High-entropy alloy nanoparticles (HEA NPs) offer unique catalytic properties due to their multi-element composition.
  • Precise control over surface active sites in HEA NPs is a significant challenge for optimizing catalysis.
  • Developing robust and efficient catalysts for selective catalytic reduction (SCR) of NO is crucial for environmental remediation.

Purpose of the Study:

  • To develop a surface composition engineering strategy for creating core-shell HEA@Rh nanoparticles.
  • To investigate the catalytic performance of the engineered HEA@Rh/CeO2 catalyst for NO reduction with H2.
  • To explore the structural dynamics and stability of the HEA@Rh nanoparticles under reaction conditions.

Main Methods:

  • Synthesis of HEA NPs on CeO2 nanorods via hydrogen spillover.
  • Galvanic replacement reaction to form core-shell HEA@Rh nanoparticles.
  • In situ X-ray absorption fine structure (XAFS) analysis to study structural evolution.
  • Evaluation of catalytic activity for selective catalytic reduction of NO with H2.

Main Results:

  • The HEA@Rh/CeO2 catalyst demonstrated significantly enhanced activity for NO reduction, especially at low temperatures, compared to Rh and conventional HEA catalysts.
  • In situ XAFS revealed reversible structural reconstruction of HEA@Rh nanoparticles under redox cycling, maintaining particle size.
  • The core-shell structure exhibited exceptional robustness, preserving integrity after repeated cycling and high temperatures.

Conclusions:

  • Surface composition engineering is a powerful strategy to enhance the catalytic potential of HEA catalysts.
  • The dynamic structural reversibility and thermal robustness of HEA@Rh nanoparticles enable stable and efficient catalysis.
  • This approach integrates structural dynamics with multicomponent synergy for advanced catalyst design.