Surface structural and chemical characterization of Pt/Ru composite electrodes: a combined study by XPS, STM and IR spectroscopy |
| |
| Authors: | S Cramm K A Friedrich K-P Geyzers U Stimming R Vogel |
| |
| Institution: | Institut für Festk?rperforschung (IFF), Forschungszentrum Jülich (KFA) GmbH, D-52425 Jülich, Germany, DE
Institut für Energieverfahrenstechnik (IEV), Forschungszentrum Jülich (KFA) GmbH, D-52425 Jülich, Germany, DE
|
| |
| Abstract: | Electrochemical Ru deposits on Pt(111) surfaces are investigated by STM; the images of the Ru-modified surfaces show islands
of monoatomic height and between 2–5 nm in diameter. The density of islands on the surface depends on the Ru deposition potential
(observed by STM and XRSD) and the cyclic voltammograms indicate an increasing Ru coverage for lower deposition potentials.
The Ru surface coverage is determined by ex-situ XPS measurements and a linear dependence of the Ru coverage on the deposition
potential is demonstrated. IR spectra of a monolayer of adsorbed CO on the Ru-modified Pt(111) surfaces show distinct bands
for CO adsorbed on Pt and on Ru. For the integrated band intensity of the CO/Ru vibration a linear dependence on deposition
potential is found indicating that lateral dipole interactions between CO adsorbed on Pt and Ru are unimportant and that the
CO coverage on the Ru islands is constant for the Ru coverages investigated. The possibility of using adsorbate vibrational
bands for the determination of the coverage of deposits is discussed.
Received: 24 June 1996 / Revised: 6 December 1996 / Accepted: 12 December 1996 |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
