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Area of Science:

  • Heterogeneous catalysis
  • Materials science
  • Surface chemistry

Background:

  • Single-atom catalysts (SACs) offer maximized metal utilization and unique electronic properties.
  • Understanding metal-adsorbate and metal-support interactions is crucial for SACs' performance but remains challenging.
  • Previous studies on activity correlations with metal atom charge states yielded controversial results.

Purpose of the Study:

  • To investigate the relationship between oxide support properties and the activity of palladium single-atom catalysts (Pd1 SACs).
  • To establish a general descriptor for selecting effective metal-support pairs for catalysis.

Main Methods:

  • Investigated Pd1 SACs on 14 different semiconductor oxide supports.
  • Correlated catalytic activity with the lowest unoccupied molecular orbital (LUMO) positions of the supports.
  • Utilized frontier molecular orbital theory to explain observed phenomena.

Main Results:

  • A linear scaling relationship was found between Pd1 SAC activity and the LUMO position of oxide supports.
  • Reducing support particle size to nanometers elevated the LUMO, boosting catalytic activity and stability.
  • Elevated support LUMO facilitated Pd1-support orbital hybridization and enhanced Pd1-adsorbate interactions.

Conclusions:

  • The LUMO position of oxide supports is a key descriptor for predicting Pd1 SAC activity and stability.
  • Tuning support electronic properties, specifically the LUMO, offers a rational design strategy for advanced catalysts.
  • Findings provide a generalizable approach for selecting optimal metal-support combinations in heterogeneous catalysis.