Physics
Scientific paper
Jun 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..430..627b&link_type=abstract
The eleventh international conference on fourier transform spectroscopy. AIP Conference Proceedings, Volume 430, pp. 627-630 (1
Physics
Scientific paper
Several studies have shown a difference in the electrochemical response of bare platinum vs platinized platinum electrodes. We have found that the thickness of the platinum black coverage on a Pt electrode also changes the spectroscopic response of CO adsorbed on such a surface. A polycrystalline electrode was platinized at 2.75 V in a solution of chloroplatinic acid/lead acetate for time periods of 10 to 30 s. External reflection spectra were calculated using a single-beam spectrum collected with a monolayer of CO on the electrode and a single beam spectrum without the adsorbed CO as a reference. At lower platinization times, the CO peak existed as the expected upward-going band. As the platinization time was increased, the band shape became dispersive and the intensity of the band increased. At the highest platinization time, the peak appeared to invert itself into a downward going band, i.e., the reflection increased in the region of the CO absorption. This surprising phenomenon appears to be directly related to the change in the surface features with increased platinization time.
Bjerke Amy E.
Griffiths Peter R.
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