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Area of Science:

  • Heterogeneous catalysis
  • Surface science
  • Chemical kinetics

Background:

  • Catalytic reactions on metal surfaces often exhibit complex kinetic behavior.
  • Understanding the interplay between different crystal facets is crucial for catalyst design.
  • Oscillatory reactions can provide insights into reaction mechanisms and surface dynamics.

Purpose of the Study:

  • To investigate the kinetic behavior of individual rhodium (Rh) nanofacets.
  • To explore the influence of interfacet coupling on reaction dynamics.
  • To understand the role of surface reconstructions in modulating catalytic oscillations.

Main Methods:

  • Utilized a curved rhodium microcrystal as a model single catalytic particle.
  • Employed field electron microscopy for in situ imaging of catalytic hydrogen oxidation.
  • Performed microkinetic simulations of coupled oscillators representing nanofacets.

Main Results:

  • Observed different oscillating reaction modes, including multifrequential oscillations, due to interfacet coupling via hydrogen diffusion.
  • Demonstrated that temperature variations induce surface reconstructions, altering coupling strength and leading to mode transitions.
  • Documented phenomena like entrainment, frequency locking, and reconstruction-induced collapse of spatial coupling.

Conclusions:

  • The kinetic behavior of coupled nanofacets is strongly influenced by surface diffusion and temperature-induced reconstructions.
  • Microkinetic simulations accurately reproduce the experimentally observed complex oscillatory dynamics and spatial synchronization.
  • This work provides a detailed understanding of how local surface structure affects macroscopic catalytic behavior.