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
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
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.