Extending surface Raman spectroscopic studies to transition metals for practical applications III. Effects of surface roughening procedure on surface-enhanced Raman spectroscopy from nickel and platinum electrodes

Citation
Qj. Huang et al., Extending surface Raman spectroscopic studies to transition metals for practical applications III. Effects of surface roughening procedure on surface-enhanced Raman spectroscopy from nickel and platinum electrodes, SURF SCI, 428, 1999, pp. 162-166
Citations number
23
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
SURFACE SCIENCE
ISSN journal
0039-6028 → ACNP
Volume
428
Year of publication
1999
Pages
162 - 166
Database
ISI
SICI code
0039-6028(19990601)428:<162:ESRSST>2.0.ZU;2-E
Abstract
Surface-enhanced Raman spectroscopy (SERS) has been applied successfully to the in situ study of Ni and Pt electrodes with different surface roughness es. The appropriate surface roughening procedure is indispensable for obtai ning good-quality surface Raman signals from transition metals, with the su rface enhancement factor ranging from one to three orders of amplification. The potential-dependent SERS spectra show that methanol is dissociated to CO at the surface, leading to catalytic poisoning of the reaction sites and , more interestingly, the onset potential of the CO oxidation is affected c onsiderably by the surface roughness. In this paper two important capabilit ies of in situ surface Raman spectroscopy are emphasized: (i) to probe the adsorbate-metal vibration in the low frequency region and (ii) to study hig hly rough transition metal surfaces with dark color that are widely used fo r practical electrocatalysis. (C) 1999 Elsevier Science B.V. All rights res erved.