| Abstract
| - The adsorption and electrooxidation of CO at a Ru(0001) electrode in perchloric acid solution have beeninvestigated as a function of temperature, potential and time using in situ FTIR spectroscopy. This buildsupon and extends previous work on the same system carried out at room temperature. As was observed atroom temperature, both linear (COL) and 3-fold-hollow (COH) binding CO adsorbates (bands at 2000−2045cm-1 and 1768−1805 cm-1, respectively) were detected on the Ru(0001) electrode at 10 °C and 50 °C.However, the temperature of the Ru(0001) electrode had a significant effect upon the structure and behaviorof the CO adlayer. At 10 °C, the in-situ FTIR data showed that the adsorbed CO species still remain in rathercompact islands up to ca. 1100 mV vs Ag/AgCl as the CO oxidation reaction proceeds, with oxidation occurringonly at the boundaries between the COad and active surface oxide/hydroxide domains. However, the IR datacollected at 50 °C strongly suggest that the adsorbed CO species are present as relatively looser and weakerstructures, which are more easily electro-oxidized. The temperature-, potential-, and coverage-dependentrelaxation and compression of the COL adlayer at low coverages are also discussed.
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