Photoinduced activation of CO2 was investigated on a K-dosed Au(111) surface. The methods used were work function measurements, high-resolution electron energy loss spectroscopy (HREELS), and thermal desorption spectroscopy. Illumination of CO2 adsorbed on a clean Au(111) surface with a 65 W Hg arc lamp produced no HREEL spectral signals indicative of the formation of CO2-. As was revealed in a previous paper (Farkas and Solymosi, J. Phys. Chem. C 2009, 113, 19930), potassium adatoms induce the formation of negatively charged CO2 on Au(111). Illumination of the CO2 + K/Au(111) system enhanced (i) the electron transfer from K-dosed Au to CO2, (ii) the amount of strongly adsorbed CO2, (iii) the formation of CO, and (iv) the intensity of the vibration loss of the asymmetric stretch of CO2-. It is assumed that the photoelectrons play a role in the photolysis of the CO 2 + K coadsorbed layer.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films