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Related Experiment Videos

NO adsorption on MoS(x) clusters: a density functional theory study.

Xiao-Dong Wen1, Yong-Wang Li, Jianguo Wang

  • 1State Key laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, Shanxi 030001, PR China.

The Journal of Physical Chemistry. B
|October 20, 2006
PubMed
Summary
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Density functional theory (DFT) reveals stoichiometric Mo-S clusters exhibit higher nitric oxide (NO) adsorption affinity. Mononitrosyl adsorption is favored at low coverages, with dinitrosyl and dimer species appearing at higher coverages.

Area of Science:

  • Materials Science
  • Surface Chemistry
  • Computational Chemistry

Background:

  • Understanding molecule adsorption on surfaces is crucial for catalysis and sensing.
  • Molybdenum sulfide (MoS2) is a promising material with diverse applications.
  • Investigating nitric oxide (NO) adsorption provides insights into surface reactivity.

Purpose of the Study:

  • To investigate nitric oxide (NO) adsorption on stoichiometric and nonstoichiometric Mo-S clusters using density functional theory (DFT).
  • To determine the preferred adsorption sites and configurations of NO on different Mo-S cluster stoichiometries.
  • To compare computed vibrational frequencies with experimental data.

Main Methods:

  • Density Functional Theory (DFT) calculations were employed.

Related Experiment Videos

  • Calculations focused on stoichiometric (Mo16S32) and nonstoichiometric (Mo16S34, Mo16S29) Mo-S clusters.
  • Adsorption energies and vibrational frequencies of NO were computed.

    • Main Results:

    • Stoichiometric Mo-S clusters demonstrated stronger NO adsorption affinity compared to nonstoichiometric ones.
    • Mononitrosyl adsorption is favored at low NO coverage.
    • Dinitrosyl and (NO)2 dimer adsorption are possible at high coverage, exhibiting strong repulsive interactions.

    Conclusions:

    • The stoichiometry of Mo-S clusters significantly influences NO adsorption behavior.
    • DFT calculations accurately predict NO adsorption modes and vibrational frequencies for mononitrosyl and dinitrosyl species.
    • Discrepancies in dimer vibrational frequencies suggest potential limitations in the model or experimental interpretation for this species.