Activation and reactions of CO2on a K-promoted Au(111) surface

Arnold Péter Farkas, F. Solymosi

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

The adsorption of potassium and CO2and their interaction on a Au(111) surface have been studied using high-resolution electron energy loss spectroscopy, thermal desorption spectroscopy, work function measurements, and Auger electron spectroscopy. Potassium adsorbs in cationic form on Au(111) at low coverage, depolarizing to a neutral metallic state at high coverage. CO 2 adsorbs only weakly on clean Au(111), desorbing with a T p ∼ 124 K. Its binding energy is greatly enhanced by the presence of potassium and led to the formation of a CO2- anion radical characterized by losses at 957, 1360, and 1620 cm-1. An enhancement of a weakly held, unperturbed CO2 also occurred on a K-dosed surface, which was attributed to the formation of an unstable cluster compound (CO2)n ·CO2-. The surface concentration and the reactivity of the CO2- radical sensitively depend on the K coverage and on the state of potassium. At low K coverages, CO2- dissociated into CO(a) and O - (a). At higher coverages, it disproportionated into stable CO3-(a) and CO(a) -; they decomposed and released only above 500 K. CO formed on a K-dosed surface gave vibration losses at 1940-1700 cm-1 and was also stabilized by potassium.

Original languageEnglish
Pages (from-to)19930-19936
Number of pages7
JournalJournal of Physical Chemistry C
Volume113
Issue number46
DOIs
Publication statusPublished - 2009

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Potassium
Carbon Monoxide
potassium
Chemical activation
activation
Thermal desorption spectroscopy
Electron energy loss spectroscopy
Auger electron spectroscopy
Binding energy
spectroscopy
Auger spectroscopy
Anions
electron spectroscopy
Negative ions
reactivity
energy dissipation
binding energy
desorption
electron energy
anions

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Activation and reactions of CO2on a K-promoted Au(111) surface. / Farkas, Arnold Péter; Solymosi, F.

In: Journal of Physical Chemistry C, Vol. 113, No. 46, 2009, p. 19930-19936.

Research output: Contribution to journalArticle

Farkas, Arnold Péter ; Solymosi, F. / Activation and reactions of CO2on a K-promoted Au(111) surface. In: Journal of Physical Chemistry C. 2009 ; Vol. 113, No. 46. pp. 19930-19936.
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