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Related Concept Videos

Catalysis02:50

Catalysis

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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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Updated: Aug 23, 2025

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Pt Atomic Single-Layer Catalyst Embedded in Defect-Enriched Ceria for Efficient CO Oxidation.

Shaohua Xie1, Liping Liu2, Yue Lu3

  • 1Department of Civil, Environmental, and Construction Engineering, Catalysis Cluster for Renewable Energy and Chemical Transformations (REACT), NanoScience Technology Center (NSTC), University of Central Florida, Orlando, Florida 32816, United States.

Journal of the American Chemical Society
|November 2, 2022
PubMed
Summary
This summary is machine-generated.

Platinum single-atom catalysts with controlled coordination structures boost CO oxidation. Embedded platinum atomic single-layers on ceria-alumina supports show superior activity and stability.

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Area of Science:

  • Catalysis
  • Materials Science
  • Surface Chemistry

Background:

  • The local coordination structure of metal sites is crucial for supported metal catalyst performance.
  • Controlling the coordination environment of single-atom catalysts (SACs) is key to optimizing their activity.

Purpose of the Study:

  • To fabricate platinum atomic single-layer (PtASL) structures with controlled local coordination environments (embedded vs. adsorbed) on ceria-alumina supports.
  • To investigate the impact of Pt1 local coordination on catalytic activity and structure evolution during reduction activation.

Main Methods:

  • Surface defect enrichment strategy for fabricating PtASL structures.
  • Characterization of Pt1 local coordination and dispersion.
  • Evaluation of catalytic activity for CO oxidation.

Main Results:

  • Achieved 100% metal dispersion with precisely controlled embedded and adsorbed PtASL structures.
  • Embedded PtASL exhibited 3.5x higher turnover frequency than adsorbed PtASL for CO oxidation.
  • Embedded PtASL showed 10-70x higher activity compared to Pt single-atoms (Pt1).
  • Favorable CO adsorption and enhanced lattice oxygen activation contributed to superior CO oxidation over embedded PtASL.

Conclusions:

  • The local coordination environment of Pt1 significantly influences catalytic activity and structural stability.
  • Embedded PtASL on ceria-alumina offers a promising pathway for high-performance catalysts.
  • Precise control over metal site coordination enables 100% atomic utilization efficiency and optimal catalytic activity.