Dresden 2003 – scientific programme
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O: Oberflächenphysik
O 12: Postersitzung (Struktur und Dynamik reiner Oberfl
ächen, Grenzfl
äche fest-flüssig, Nanostrukturen, Teilchen und Cluster, Halbleiteroberfl
ächen und Grenzfl
ächen, Zeitaufgelöste Spektroskopie, Rastersondentechniken, Methodisches)
O 12.7: Poster
Monday, March 24, 2003, 18:00–21:00, P1
Following adsorption kinetics at electrolyte/metal interfaces through crystal truncation scattering: Sulfur on Au(111) — •Frank Renner1, Jose Martin-Gago2, C. Vericat3, M.E. Vela3, G.A. Andreasen3, R.C. Salvarezza3, F. Borgatti4, R. Felici4, T.L. Lee1, and Jörg Zegenhagen1 — 1ESRF, Grenoble, France — 2ICM-CSIC, Madrid, Spain — 3INIFTA, La Plata, Argentina — 4INFM-OGG, Grenoble, France
By combining electrochemical methods, in-situ scanning tunneling microscopy, and surface X-ray diffraction and in particular so-called crystal truncation rod scattering, we were able study the structure and kinetics of S/Au(111) electrodes in aqueous electrolytes under potential control. Integrated intensities of a particular crystal truncation rod at anti-Bragg condition were used to trace the sulfur adsorption and desorption as a function of electrode potential in real-time. We established that the S adsorption follows a Langmuir isotherm, whereas the S desorption is a first order process. The analysis of the x-ray data showed taht a weakly bound S layer is present on the surface before charge transfer, and thus specific adsorption, occurs.