Scanning Tunneling Microscopy and Infrared Spectroscopy as Combined In- Situ Probes of Electrochemical Adlayer Structure: Cyanide on PT(111)
PURDUE UNIV LAFAYETTE IN DEPT OF CHEMISTRY
Pagination or Media Count:
The spatial structure of irreversibly adsorbed cyanide adlayers on a Pt111 electrode is deduced by means of in-situ scanning tunneling microscopy STM combined with infrared reflection-absorption spectroscopy IRAS. The latter data suggests atop-like Pt-CN coordination. The STM images display a 2 sq rt of 3 x 2 sq rt of 3R30 deg-7CN structure, with cyanides bound in symmetric atop sites surrounded by hexagonal clusters of CN, likely bound in near-atop sites. This arrangement, stable over the applied potential range -0.5 to 0 V vs SCE, gives way to a 2 x 2 structure and disordered adlayers at lower potentials. These findings are compared with previous structural information deduced from ex-situ electron diffraction.
- Inorganic Chemistry
- Physical Chemistry
- Atomic and Molecular Physics and Spectroscopy