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Updated: Jun 21, 2025

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Subsurface Single-Atom Catalyst Enabled by Mechanochemical Synthesis for Oxidation Chemistry.

Xuze Guan1, Rong Han2, Hiroyuki Asakura3,4

  • 1Department of Chemical Engineering, University College London, London, WC1E 7JE, UK.

Angewandte Chemie (International Ed. in English)
|July 14, 2024
PubMed
Summary

Mechanochemistry stabilizes single copper atoms within iron oxide supports. Subsurface single-atom catalysts prevent sintering and poisoning, unlike surface atoms, advancing catalyst design.

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ammonia oxidationball millingheterogeneous catalysissingle-atom catalystssurface chemistry

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Area of Science:

  • Materials Science
  • Catalysis
  • Nanotechnology

Background:

  • Single-atom catalysts offer high atom efficiency but face instability issues like sintering and poisoning.
  • Controlling atom location (surface vs. subsurface) is key to catalyst performance.

Purpose of the Study:

  • To investigate the stability and properties of single copper atoms embedded in an iron oxide support using a mechanochemical method.
  • To compare the behavior of surface versus subsurface single copper atoms under different environmental conditions.

Main Methods:

  • Utilized the mechanochemical method for atom insertion.
  • Synthesized catalysts with single Cu atoms at surface and subsurface sites of Fe2O3.
  • Evaluated catalyst stability under oxidation and reduction environments.

Main Results:

  • Subsurface single Cu atoms in Fe2O3 remained isolated in both oxidation and reduction conditions.
  • Surface single Cu atoms on Fe2O3 exhibited sintering under reduction conditions.
  • Distinct adsorption properties and reaction mechanisms were observed based on atom location.

Conclusions:

  • Mechanochemically synthesized subsurface single-atom catalysts demonstrate enhanced stability against sintering and poisoning.
  • Controlling the subsurface embedding of single atoms offers a novel strategy for designing robust and efficient catalysts.
  • This work necessitates new perspectives in catalyst design for improved industrial applications.