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Stamenkovic V, Chou KC, Somorjai GA, Ross PN, Markovic NM: Vibrational properties of CO at the Pt (111)-solution interface: the anomalous Stark-tuning slope. J Phys Chem B. 2005 Jan 20;109(2):678-80.
Vibrational properties of CO have been studied on Pt (111) in acid and alkaline electrolytes by synchronous measurements of CO oxidation current (0.5 mV/s) and IRAS spectra (one spectrum for every 1 mV). We found that in acid solutions the frequency-tuning rate (dnu (CO)/dE) as well as the potential-dependent bandwidth (dDeltanu1/2/dE) deviates from expected linear relationships. This unusual potential-dependent behavior is interpreted in terms of compression/dissipation of CO islands during the CO oxidation, engendered by competitive adsorption between inactive anions from a supporting electrolyte and the reactive OH species. |
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