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Updated: Sep 18, 2025

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Dynamic interfacial structure of au/CeO2 catalyst upon thermal activation.

Hongpeng Liu1, Zhongliang Cao1, Siyuan Yang1

  • 1Institute of Molecular Plus, Department of Chemistry, Tianjin University, Tianjin 300072, China.

Journal of Colloid and Interface Science
|June 24, 2025
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Summary

The study reveals how gold nanoparticles on ceria supports restructure at the atomic level during heating. This dynamic behavior, influenced by support interactions and defects, impacts catalyst performance.

Keywords:
Atomic scaleAuCeO(2)In situ TEMMetal-support interaction

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Area of Science:

  • Materials Science
  • Catalysis
  • Surface Science

Background:

  • Catalyst performance is critically determined by the dynamic behavior of oxide-supported metal catalyst interfaces under thermal and gaseous activation.
  • Understanding the atomic-scale evolution of these interfaces is crucial for designing efficient catalysts.

Purpose of the Study:

  • To reveal the atomic-scale evolution of gold (Au) nanoparticles on cerium dioxide (CeO2) supports during thermal treatment.
  • To elucidate the key factors governing the Au/CeO2 interface structure and the mechanisms of nanoparticle restructuring.

Main Methods:

  • In situ transmission electron microscopy (TEM) was employed to observe the dynamic behavior of Au nanoparticles on CeO2 supports at the atomic scale.
  • Analysis focused on the structural evolution during thermal activation.

Main Results:

  • The Au/CeO2 interface structure is dictated by epitaxial matching, nanoparticle morphology, and metal-support interactions, governed by energy balances.
  • Thermal activation induced significant structural reorganization, including size- and support-dependent facet reorientation.
  • Crystalline defects, such as twin boundaries and dislocations, facilitate atomic rearrangement and reduce the energy barrier for transformations.

Conclusions:

  • The dynamic restructuring of Au nanoparticles on CeO2 during thermal treatment is a complex process influenced by multiple factors.
  • Understanding these atomic-scale transformations is key to controlling catalyst properties and enhancing catalytic performance.