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Single-Atom-Layer-Induced Reversed Diffusion Pathway of Reactive Metal-Support Interaction.

Xiao Han1, Shuwen Niu2, Geng Wu3

  • 1Hefei National Research Center for Physical Sciences at the Microscale, Department of Applied Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, P.R. China.

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|November 27, 2025
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Summary
This summary is machine-generated.

This study reveals a new mechanism for reactive metal-support interaction (RMSI) in Pt/TiO2 catalysts. Platinum atoms first form a single layer on the support before titanium incorporates, creating an efficient intermetallic compound for catalysis.

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Area of Science:

  • Catalysis science
  • Materials science
  • Surface chemistry

Background:

  • Reactive metal-support interaction (RMSI) is crucial for tuning catalyst properties.
  • Existing models propose metal atom diffusion from support to nanoparticles during RMSI.

Purpose of the Study:

  • To elucidate the atomic-level mechanism of RMSI in Pt/TiO2 catalysts.
  • To investigate the formation pathway of platinum-titanium intermetallic compounds (IMCs).

Main Methods:

  • In situ heating aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM).
  • Theoretical analysis of diffusion pathways and electronic structure changes.

Main Results:

  • A reversed diffusion pathway for RMSI was observed, with Pt atoms spreading to form a single-atom layer on TiO2 first.
  • This single-atom layer Pt facilitated Ti-O bond weakening, oxygen release, and Ti migration, enabling Pt3Ti IMC formation.
  • The resulting Pt3Ti IMC showed electron-rich Pt sites and enhanced resistance to CO poisoning.

Conclusions:

  • The formation of a single-atom-layer Pt intermediate is key to effective IMC formation in Pt/TiO2.
  • Understanding this reversed diffusion pathway provides guidance for designing catalysts with improved IMC formation and performance.
  • The Pt3Ti IMC demonstrates superior electrocatalytic activity for hydrogen oxidation due to reduced CO poisoning.