Photoelectron spectroscop1c studies of the adsorption of CO2 on potassium-promoted Rh(111) surface

János Kiss, Károly Révész, Frigyes Solymosi

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81 Citations (Scopus)

Abstract

Adsorption of CO2 has been studied on clean and potassium-dosed Rh(111) surfaces by means of UPS and XPS. CO2 adsorbs molecularly at 90 K on clean Rh without a strong influence on the electronic structure of the adsorbed layer. Adsorption of CO2 on potassium-dosed Rh(111) (θk = 0.33) at 100 K and annealing the adsorbed layer at 131 K produced three peaks at 5.2. 8.7 and 10.9 eV in the Hell spectrum and 532.8 for O(1s) and 290.5 eV for C(1s) in XPS. These emissions were attributed to the formation of CO2- radical anions. At higher temperatures the CO2 radical is transformed into carbonate and CO. Carbonate species is characterized by the 3.5. 8.4 and 10.2 eV peaks in UPS, and by C(1s) at 289.0 eV and O(1s) at 531.8 eV levels in XPS. At lower potassium coverage (θk = 0.1). carbonate formation was not observed, but the CO2 anion radical dissociated to CO and O at 131-179 K. This process was accompanied by the appearance of photoemission peaks at 8.2, 11.2 and 6.0 eV.

Original languageEnglish
Pages (from-to)36-54
Number of pages19
JournalSurface Science
Volume207
Issue number1
DOIs
Publication statusPublished - Dec 2 1988

ASJC Scopus subject areas

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

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