In order to elucidate electronic effects on the oxidation of CO on small Ru clusters, we investigated this reaction on well defined Ru/Au(111) model systems via parallel in-situ STM studies of the structure and electrochemical deposition of Ru on Au(111) in H2SO4 solution and cyclic voltammetry of CO monolayer oxidation on these surfaces. The Ru deposit consists of nanoscale islands, which coalesce with increasing coverage. The Ru saturation coverage depends on the deposition potential, resulting in Ru submonolayer (>0.1 V), (defective) monolayer (≥ -0.1 V), and multilayer films (< -0.1 V). At potentials > 0.6 V irreversible formation of Ru oxide/hydroxide species is observed, which can be partly reduced in the range 0.4 to 0.0 V. CO stripping commences at ≈0.1 V and occurs over a broad potential range. From the stripping charge a local CO coverage on the Ru monolayer islands of 0.7 ML was estimated. The observed influence of the morphology of the Ru deposit on the CO stripping voltamm...etry is explained by (local) variations in the CO adsorption energy due to electronic modifications of the Ru film.
Keywords:
Au(111) / Bimetallic surfaces / CO oxidation / Ru deposition
Source:
Journal of Electroanalytical Chemistry, 2001, 500, 1-2, 479-490
TY - JOUR
AU - Štrbac, Svetlana
AU - Maroun, Fouad
AU - Magnussen, Olaf Magnus
AU - Behm, Rolf Jürgen
PY - 2001
UR - https://cer.ihtm.bg.ac.rs/handle/123456789/4345
AB - In order to elucidate electronic effects on the oxidation of CO on small Ru clusters, we investigated this reaction on well defined Ru/Au(111) model systems via parallel in-situ STM studies of the structure and electrochemical deposition of Ru on Au(111) in H2SO4 solution and cyclic voltammetry of CO monolayer oxidation on these surfaces. The Ru deposit consists of nanoscale islands, which coalesce with increasing coverage. The Ru saturation coverage depends on the deposition potential, resulting in Ru submonolayer (>0.1 V), (defective) monolayer (≥ -0.1 V), and multilayer films (< -0.1 V). At potentials > 0.6 V irreversible formation of Ru oxide/hydroxide species is observed, which can be partly reduced in the range 0.4 to 0.0 V. CO stripping commences at ≈0.1 V and occurs over a broad potential range. From the stripping charge a local CO coverage on the Ru monolayer islands of 0.7 ML was estimated. The observed influence of the morphology of the Ru deposit on the CO stripping voltammetry is explained by (local) variations in the CO adsorption energy due to electronic modifications of the Ru film.
PB - Elsevier
T2 - Journal of Electroanalytical Chemistry
T1 - The structure, growth and reactivity of electrodeposited Ru/Au(111) surfaces
VL - 500
IS - 1-2
SP - 479
EP - 490
DO - 10.1016/S0022-0728(00)00471-X
ER -
@article{
author = "Štrbac, Svetlana and Maroun, Fouad and Magnussen, Olaf Magnus and Behm, Rolf Jürgen",
year = "2001",
abstract = "In order to elucidate electronic effects on the oxidation of CO on small Ru clusters, we investigated this reaction on well defined Ru/Au(111) model systems via parallel in-situ STM studies of the structure and electrochemical deposition of Ru on Au(111) in H2SO4 solution and cyclic voltammetry of CO monolayer oxidation on these surfaces. The Ru deposit consists of nanoscale islands, which coalesce with increasing coverage. The Ru saturation coverage depends on the deposition potential, resulting in Ru submonolayer (>0.1 V), (defective) monolayer (≥ -0.1 V), and multilayer films (< -0.1 V). At potentials > 0.6 V irreversible formation of Ru oxide/hydroxide species is observed, which can be partly reduced in the range 0.4 to 0.0 V. CO stripping commences at ≈0.1 V and occurs over a broad potential range. From the stripping charge a local CO coverage on the Ru monolayer islands of 0.7 ML was estimated. The observed influence of the morphology of the Ru deposit on the CO stripping voltammetry is explained by (local) variations in the CO adsorption energy due to electronic modifications of the Ru film.",
publisher = "Elsevier",
journal = "Journal of Electroanalytical Chemistry",
title = "The structure, growth and reactivity of electrodeposited Ru/Au(111) surfaces",
volume = "500",
number = "1-2",
pages = "479-490",
doi = "10.1016/S0022-0728(00)00471-X"
}
Štrbac, S., Maroun, F., Magnussen, O. M.,& Behm, R. J.. (2001). The structure, growth and reactivity of electrodeposited Ru/Au(111) surfaces. in Journal of Electroanalytical Chemistry
Elsevier., 500(1-2), 479-490.
https://doi.org/10.1016/S0022-0728(00)00471-X
Štrbac S, Maroun F, Magnussen OM, Behm RJ. The structure, growth and reactivity of electrodeposited Ru/Au(111) surfaces. in Journal of Electroanalytical Chemistry. 2001;500(1-2):479-490.
doi:10.1016/S0022-0728(00)00471-X .
Štrbac, Svetlana, Maroun, Fouad, Magnussen, Olaf Magnus, Behm, Rolf Jürgen, "The structure, growth and reactivity of electrodeposited Ru/Au(111) surfaces" in Journal of Electroanalytical Chemistry, 500, no. 1-2 (2001):479-490,
https://doi.org/10.1016/S0022-0728(00)00471-X . .
