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Metal-Oxide Interface Sites Created Using Atomic Layer Deposition and Tested for CO Oxidation.

Wang Ke1, Ilkeun Lee1, Francisco Zaera1

  • 1Department of Chemistry and UCR Center for Catalysis, University of California, Riverside, California 92521, United States.

ACS Catalysis
|July 24, 2025
PubMed
Summary

The order of depositing platinum (Pt) and titanium dioxide (TiO2) on SBA-15 significantly impacts catalyst performance. Depositing TiO2 first, followed by Pt, optimizes catalytic activity by creating ideal Pt/TiO2 interface sites for reactions.

Keywords:
atomic layer depositioncarbon monoxidein situ infrared absorption spectroscopymetal–oxide interfaceoxidation catalysisplatinumtitania

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Area of Science:

  • Materials Science
  • Catalysis
  • Nanotechnology

Background:

  • High-surface-area catalysts are crucial for various chemical reactions.
  • Controlling the interface between metal nanoparticles and support materials is key to optimizing catalyst performance.
  • Atomic Layer Deposition (ALD) offers precise control over thin film deposition at the nanoscale.

Purpose of the Study:

  • To systematically characterize the performance of Pt/TiO2 catalysts supported on SBA-15.
  • To investigate the influence of the deposition order (TiO2 first vs. Pt first) on catalyst properties and activity.
  • To elucidate the role of Pt/TiO2 interface sites in catalytic mechanisms.

Main Methods:

  • Atomic Layer Deposition (ALD) for creating TiO2 thin films on SBA-15.
  • In situ infrared absorption spectroscopy (IR) for characterizing adsorbed CO species.
  • Electron microscopy for analyzing catalyst morphology.
  • Adsorption-desorption isothermal measurements for surface area analysis.

Main Results:

  • TiO2 films evenly distributed within SBA-15 mesopores with controllable submonolayer thickness.
  • Deposition order significantly altered catalyst properties and Pt nanoparticle characteristics.
  • Pt deposited on TiO2/SBA-15 resulted in smaller NPs and lower Pt coordination.
  • TiO2 deposited on Pt/SBA-15 led to partial Pt surface blockage and altered CO binding at interface sites.
  • Optimal catalytic activity achieved with TiO2 deposited first, at approximately half-monolayer coverage (≥2 ALD cycles).

Conclusions:

  • The sequence of ALD for TiO2 and Pt deposition critically influences the resulting catalyst's structure-property relationships.
  • Pt/TiO2 interface sites play a vital role in the catalytic reaction mechanism, involving CO adsorption and migration.
  • Tuning the density of these interface sites by controlling TiO2 coverage is essential for maximizing catalytic efficiency.