Abstract
Sulfate adlayers on a copper(111) electrode were investigated by in-situ infrared reflection absorption spectroscopy (IRRAS) combined with in-situ scanning tunneling microscopy (STM). The latter data show clear evidence for a bridging bidendate coordination of sulfate to the copper surface. The IR spectra exhibit one single absorption band in the frequency range of 1205–1225 cm −1. Further analysis of the band frequency and intensity with respect to the electrode potential leads to sulfate desorption with sulfate remaining in islands at the surface during the desorption process. This model is supported by additional STM measurements of the desorption behavior.
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