Y. Suzuki et al., EVIDENCE FOR INFRARED-ABSORPTION ENHANCEMENT OF SPECIES AT THE LITHIUM METAL ELECTROLYTIC SOLUTION INTERFACE, Applied surface science, 84(1), 1995, pp. 1-7
Citations number
22
Categorie Soggetti
Physics, Condensed Matter","Chemistry Physical","Materials Science, Coatings & Films
Infrared ATR spectroscopic measurements have been made to investigate
electrochemical species at the interface between metallic lithium and
propylene carbonate (PC) solution containing 0.5M LiClO4. The metal wa
s electrodeposited on the internal reflection plane of a Ge prism at -
0.2 V (versus Li/Li+). Lithium deposition was demonstrated by measurin
g both the cyclic voltammogram and light reflectivity simultaneously.
The angle of incidence (theta) was varied from 25-degrees to 70-degree
s in the ATR measurements. Remarkably intensified bands were observed
at 1260 and 1020 cm-1 in p- and s-polarized ATR spectra measured at 0.
35 V. Before Li deposition, the former band was extremely weak and the
latter was not observed. Irrespective of polarization, the 1020 cm-1
band exhibited a maximum intensity at theta = 40-degrees at which the
background reflectivity was minimum, whereas the intensity of the 1260
cm-1 band increased with decreasing theta and reached a maximum at 30
-degrees. Most part of the enhancement observed for these bands is exp
lained in terms of the transverse collective resonance of free electro
ns in the Li film.