Presentation Information
[3P84]The adsorbed structure of carbonate species formed via CO2 disproportion on Cu(111)
*Wataru Osada1, Yoshiko Sakaguchi2, Noriyuki Tsukahara2,3, Jun Yoshinobu2 (1. National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, 2. Institute of Solid State Physics, The University of Tokyo, 3. National Institute of Technology, Gunma College)
The surface reaction of CO2 on Cu(111) at the near-ambient condition was investigated using scanning tunneling microscopy (STM) and in-situ infrared reflection absorption spectroscopy (IRAS). CO2 exposure was carried out at 300 K, and the pressure was 0.1 Pa for STM and 0.01 Pa for in-situ IRAS. In the STM images after CO2 exposure, the depletion having 3-fold rotation symmetry was observed, attributed to the adsorbed carbonate (CO3) species with the molecular plane parallel to the surface. In-situ IRAS experiment, which was conducted under CO2 atmosphere, observed development of the vibrational peak at 1288-1292 cm−1. This can be assigned to the asymmetric stretching mode of CO3 parallel to the surface, indicating the adsorption at the bridge site judging from the surface normal dipole selection rule. We conclude that CO2 is chemisorbed as carbonate on Cu(111) at the near-ambient condition at 300 K. It is adsorbed at the bridge site with the molecular plane parallel to the surface.