Temperature- and pressure-dependent adsorption configuration of NO molecules on Rh(111) surface: A theoretical study

Takahiro Hirai, Masaki Okoshi, Atsushi Ishikawa, Hiromi Nakai

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Understanding the behavior of NO molecules on Rh metal surfaces is necessary for gaining fundamental knowledge about catalytic chemistry and surface science. The present theoretical study details the configuration of NO molecules adsorbed on Rh(111) surface on the basis of density functional theory (DFT) calculations. The impact of coverage dependences on the adsorption/desorption energies is examined systematically: multiple configurations of NO adsorption structures are investigated with NO surface coverage from 0.06 to 0.75. A phase diagram for the various NO configurations with temperature and pressure is obtained by considering the adsorption equilibrium. Adsorption energies of NO molecules generally decrease with increasing surface coverage, reflecting the repulsive interactions between the adsorbed NO molecules. Microkinetic simulations for temperature-programmed desorption (TPD) spectra are performed. Simulated TPD spectra on the basis of the surface coverage-dependent desorption energies are in reasonable agreement with the experimental results.

Original languageEnglish
Pages (from-to)58-62
Number of pages5
JournalSurface Science
Volume686
DOIs
Publication statusPublished - 2019 Aug 1

Keywords

  • Adsorption equilibrium
  • DFT (density functional theory)
  • NO (nitric oxide)
  • Phase diagram
  • Rh (rhodium)
  • TPD (temperature-programmed desorption)

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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