Abstract
We report on the results of the in-situ structural characterization of underpotential deposited TI and Pb on Cu(111) electrodes with x-ray standing waves. These measurements show that submonolayer amounts of Ti and Pb are adsorbed at a distance normal to the Cu(111) surface, which is consistent with a threefold coordinated adsorption site for both, TI and Pb. On oxidized Cu(111) surfaces, the adsorbate relaxes inward by about 0.3 Å in both cases. This can be understood by oxygen incorporation into the Cu(111) surface for which a model is proposed. Oxidation and reduction of the Cu electrodes can be controlled by the electrode potential and were monitored by cyclic voltammetry. The x-ray standing wave technique is explained briefly in particular with respect to its application towards the characterization of electrode-electrolyte interfaces.
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Zegenhagen, J., Materlik, G., Dirks, J.P., Schmäh, M. (1994). Electrode-Electrolyte Interfaces Investigated with X-Ray Standing Waves: Cu(111)/Pb, Tl. In: Melendres, C.A., Tadjeddine, A. (eds) Synchrotron Techniques in Interfacial Electrochemistry. NATO ASI Series, vol 432. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-3200-0_20
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DOI: https://doi.org/10.1007/978-94-017-3200-0_20
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