Related Experiment Video
Updated: Jul 17, 2025
07:47
Reverse Microemulsion-mediated Synthesis of Monometallic and Bimetallic Early Transition Metal Carbide and Nitride Nanoparticles
Published on: November 27, 2015
10.9K
Sub-nanometric High-Entropy Alloy Cluster: Hydrogen Spillover Driven Synthesis on CeO2 and Structural Reversibility
Naoki Hashimoto1, Kohsuke Mori1,2, Shuichiro Matsuzaki1
1Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan.
JACS Au
|September 1, 2023
Summary
Sub-nanometer high-entropy alloy (HEA) clusters synthesized on ceria nanorods show enhanced low-temperature catalytic activity for NO reduction. These quantum-sized clusters exhibit unique structural reversibility and novel properties due to multielement mixing.
Area of Science:
- Materials Science
- Catalysis
- Nanotechnology
Background:
- High-entropy alloy (HEA) nanoparticles (NPs) offer synergistic effects for catalysis.
- Sub-nanometer HEA clusters (<1 nm) are underexplored but may exhibit unique quantum properties.
- Ceria (CeO2) is a reducible material known to facilitate catalytic reactions.
Purpose of the Study:
- To synthesize sub-nanometer high-entropy alloy (HEA) clusters on ceria nanorods (CeO2-NRs).
- To investigate the catalytic performance of these HEA clusters for low-temperature NO reduction.
- To explore the structural stability and unique properties of quantum-sized HEA clusters.
Main Methods:
- Synthesis of CeO2 nanorods (CeO2-NRs).
- Formation of sub-nanometer CoNiCuZnPd HEA clusters on CeO2-NRs via hydrogen spillover.
- Evaluation of catalytic activity for H2 reduction of NO.
- Analysis of structural reversibility under oxidative/reductive conditions.
- Experimental and theoretical characterization.
Main Results:
- Sub-nanometer CoNiCuZnPd HEA clusters were successfully synthesized on CeO2-NRs.
- The HEA clusters demonstrated significantly higher catalytic activity for NO reduction at low temperatures compared to monometallic catalysts.
- The HEA clusters exhibited remarkable structural reversibility under cycling conditions.
- Novel catalytic properties were attributed to multielement mixing in quantum-sized regions.
Conclusions:
- Sub-nanometer HEA clusters on CeO2-NRs are promising catalysts for low-temperature NO reduction.
- The unique properties arise from quantum size effects and synergistic multielement interactions.
- The developed HEA clusters offer a new avenue for designing advanced catalytic materials.
