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Dynamic Stabilization of Ultrafine Pt Nanoparticles against Sintering: Insights from Machine Learning.

Mingyu Tang1, Yuxin Li1, Kuibo Yin2

  • 1School of Chemistry and Chemical Engineering, Southeast University, Nanjing, Jiangsu 211189, P. R. China.

Nano Letters
|March 3, 2026
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Summary

This study developed a dynamic confinement method to prevent metal sintering in catalysts. Ultrafine platinum nanoparticles on iron oxide showed high thermal stability and maintained catalytic activity for extended periods.

Keywords:
NanocatalystsNanoconfinementPtSinter-resistance

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Area of Science:

  • Materials Science
  • Catalysis
  • Nanotechnology

Background:

  • Metal sintering is a major cause of catalyst deactivation, especially for ultrafine nanoparticles.
  • Maintaining nanoparticle stability under reaction conditions is crucial for catalyst longevity.

Purpose of the Study:

  • To develop a dynamic confinement strategy for stabilizing ultrafine platinum (Pt) nanoparticles (<3 nm) on porous iron oxide (Fe2O3).
  • To achieve high sinter-resistance and maintain catalytic activity under demanding conditions.

Main Methods:

  • Utilized *in situ* transmission electron microscopy (TEM) for real-time observation of nanoparticle behavior.
  • Employed artificial neural network (ANN) analysis to predict nanoparticle size evolution and understand sintering mechanisms.
  • Conducted stability tests, including aging at high temperatures (up to 850 °C) and elevated space velocities, and catalytic performance tests (CO conversion).

Main Results:

  • Achieved significant sinter-resistance for Pt nanoparticles up to 850 °C.
  • Confirmed nanoparticle mobility and retained catalytic activity, resisting coalescence and ripening.
  • Demonstrated complete CO conversion at 150 °C even after aging at 500 °C, with sustained activity for over 600 hours.
  • ANN model successfully predicted nanoparticle size evolution.

Conclusions:

  • The dynamic confinement strategy effectively stabilizes ultrafine Pt nanoparticles, preventing sintering and deactivation.
  • This approach offers fundamental insights into antisintering mechanisms.
  • Provides a pathway for designing highly thermally stable nanocatalysts for various applications.