Showing papers by "Andrew Hamnett published in 2000"

Electro-oxidation of CO at the Ru(0001) single-crystal electrode surface

Abstract: In situ FTIR spectroscopic and electrochemical data and ex situ (emersion) electron diffraction (LEED and RHEED) and Auger spectroscopic data are presented on the structure and reactivity, with res...

In situ FTIR studies of the effect of temperature on the adsorption and electrooxidation of CO at the Ru(0001) electrode surface

Abstract: The adsorption and electrooxidation of CO at a Ru(0001) electrode in perchloric acid solution have been investigated as a function of temperature, potential and time using in situ FTIR spectroscopy. This builds upon and extends previous work on the same system carried out at room temperature. As was observed at room temperature, both linear (COL) and 3-fold-hollow (COH) binding CO adsorbates (bands at 2000−2045 cm-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 behavior of the CO adlayer. At 10 °C, the in-situ FTIR data showed that the adsorbed CO species still remain in rather compact islands up to ca. 1100 mV vs Ag/AgCl as the CO oxidation reaction proceeds, with oxidation occurring only at the boundaries between the COad and active surface oxide/hydroxide domains. However, the IR data collected at 50 °C strongly suggest that the adsorbed CO species are prese...