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Unraveling CO adsorption on model single-atom catalysts
Jan Hulva1, Matthias Meier1,2, Roland Bliem1
1Institute of Applied Physics, TU Wien, Vienna, Austria.
Investigating single-atom catalysts on iron oxide supports reveals that metal-CO bond strength varies significantly. Local environment and charge transfer effects influence catalyst stability and reactivity, impacting adsorption energies.
Area of Science:
- Surface science
- Catalysis
- Materials science
Background:
- Understanding single-atom catalyst (SAC) local environments is crucial for predicting stability and reactivity.
- Metal-support interactions significantly influence catalytic performance.
Purpose of the Study:
- To investigate the adsorption properties of various single metal atoms (Cu, Ag, Au, Ni, Pd, Pt, Rh, Ir) on a model Fe3O4(001) support.
- To elucidate the role of the local environment and charge transfer in modifying metal-CO interactions.
Main Methods:
- Deposition of single metal atoms on Fe3O4(001) at room temperature.
- Utilizing surface science techniques to study CO adsorption.
- Analyzing charge transfer effects and d-state modifications.
Main Results:
- CO adsorption strength at single metal sites differs from bulk metals and clusters.
- Charge transfer into the Fe3O4 support alters metal d-states and metal-CO bond strength.
- CO-induced structural distortions reduce adsorption energies, with relaxations predictable via coordination chemistry.
Conclusions:
- The local coordination environment and electronic interactions on Fe3O4(001) critically influence SAC behavior.
- Predicting catalytic activity requires considering both electronic structure and CO-induced geometric relaxations.
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