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Area of Science:

  • Materials Science
  • Catalysis
  • Surface Chemistry

Background:

  • Platinum single-atom catalysts (SACs) face a trade-off between activity and stability in oxidation reactions.
  • High-coordination sites are stable but inactive; low-coordination sites are active but unstable.
  • Overoxidation and aggregation limit the practical application of SACs.

Purpose of the Study:

  • To develop a defect-engineering strategy to overcome the activity-stability dilemma in platinum SACs.
  • To anchor oxidized platinum single atoms onto a vacancy-engineered perovskite support (v-LaFeO3).
  • To enhance catalytic performance for oxidation reactions.

Main Methods:

  • Defect engineering of LaFeO3 perovskite by introducing La-vacancies.
  • Anchoring oxidized platinum single atoms (Pt4+) onto the v-LaFeO3 support.
  • Characterization using structural analysis and in situ experiments.
  • Density Functional Theory (DFT) calculations to verify structure and mechanism.

Main Results:

  • The v-LaFeO3 support enhances lattice oxygen mobility and preserves structural integrity.
  • Anchored Pt single atoms exhibit optimized coordination and a high oxidation state (Pt4+).
  • The catalyst demonstrates high and stable activity for CO oxidation without reduction pretreatment.
  • Vacancies modulate the interfacial electronic structure, activating lattice oxygen and accelerating O2 activation.

Conclusions:

  • Precise control of support defects can concurrently optimize electronic states and stability of SACs.
  • This defect-engineering strategy offers a generalized paradigm for designing robust oxidation catalysts.
  • The developed catalyst shows promise for long-term, high-temperature oxidation reactions.