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
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Surface-enhanced Raman spectroscopy (SERS) has been applied successfully to the in situ study of Ni and Pt electrodes with different surface roughnesses. The appropriate surface roughening procedure is indispensable for obtaining good-quality surface Raman signals from transition metals, with the surface 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 considerably by the surface roughness. In this paper two important capabilities of in situ surface Raman spectroscopy are emphasized: (i) to probe the adsorbate-metal vibration in the low frequency region and (ii) to study highly rough transition metal surfaces with dark color that are widely used for practical electrocatalysis. (C) 1999 Elsevier Science B.V. All rights reserved.