Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 4083-4090 |
| Seitenumfang | 8 |
| Fachzeitschrift | Journal of Physical Chemistry C |
| Jahrgang | 116 |
| Ausgabenummer | 6 |
| Frühes Online-Datum | 3 Feb. 2012 |
| Publikationsstatus | Veröffentlicht - 16 Feb. 2012 |
Abstract
Self-organization phenomena such as rate oscillations, chemical wave patterns, and precipitation of nanoparticles can be observed in the catalytic H 2 + O 2 reaction on a Rh(111) surface after alloying with Ni. The bimetallic Rh(111)/Ni surface has been studied in the 10 -6-10 -4 mbar range using PEEM (photoemission electron microscopy) and LEEM/SPELEEM (low energy electron microscopy and its spectroscopic variant) as the main analytical methods. The Rh(111)/Ni catalysts are prepared by thermal decomposition of Ni(CO) 4 on Rh(111), resulting in an alloyed surface with about 25% Ni in the topmost layers. One finds rate oscillations and chemical wave patterns comprising target patterns, pulse trains, and rotating spiral waves. The oscillatory behavior is attributed to periodic changes in the composition of the bimetallic surface alloy causing concomitant variations in catalytic activity. Under pattern-forming reaction conditions, three-dimensional NiO particles develop on top of the alloyed Rh/Ni surface, with dimensions ranging from <1 μm up to 50 μm. Their size which depends on the total pressure controls the Ni content in the surface alloy.
ASJC Scopus Sachgebiete
- Werkstoffwissenschaften (insg.)
- Elektronische, optische und magnetische Materialien
- Energie (insg.)
- Allgemeine Energie
- Chemie (insg.)
- Physikalische und Theoretische Chemie
- Werkstoffwissenschaften (insg.)
- Oberflächen, Beschichtungen und Folien
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in: Journal of Physical Chemistry C, Jahrgang 116, Nr. 6, 16.02.2012, S. 4083-4090.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Chemical waves and rate oscillations in the H 2 + O 2 reaction on a bimetallic Rh(111)/Ni catalyst
AU - Lovis, Florian
AU - Smolinsky, Tim
AU - Locatelli, Andrea
AU - Niño, Miguel Á
AU - Imbihl, Ronald
PY - 2012/2/16
Y1 - 2012/2/16
N2 - Self-organization phenomena such as rate oscillations, chemical wave patterns, and precipitation of nanoparticles can be observed in the catalytic H 2 + O 2 reaction on a Rh(111) surface after alloying with Ni. The bimetallic Rh(111)/Ni surface has been studied in the 10 -6-10 -4 mbar range using PEEM (photoemission electron microscopy) and LEEM/SPELEEM (low energy electron microscopy and its spectroscopic variant) as the main analytical methods. The Rh(111)/Ni catalysts are prepared by thermal decomposition of Ni(CO) 4 on Rh(111), resulting in an alloyed surface with about 25% Ni in the topmost layers. One finds rate oscillations and chemical wave patterns comprising target patterns, pulse trains, and rotating spiral waves. The oscillatory behavior is attributed to periodic changes in the composition of the bimetallic surface alloy causing concomitant variations in catalytic activity. Under pattern-forming reaction conditions, three-dimensional NiO particles develop on top of the alloyed Rh/Ni surface, with dimensions ranging from <1 μm up to 50 μm. Their size which depends on the total pressure controls the Ni content in the surface alloy.
AB - Self-organization phenomena such as rate oscillations, chemical wave patterns, and precipitation of nanoparticles can be observed in the catalytic H 2 + O 2 reaction on a Rh(111) surface after alloying with Ni. The bimetallic Rh(111)/Ni surface has been studied in the 10 -6-10 -4 mbar range using PEEM (photoemission electron microscopy) and LEEM/SPELEEM (low energy electron microscopy and its spectroscopic variant) as the main analytical methods. The Rh(111)/Ni catalysts are prepared by thermal decomposition of Ni(CO) 4 on Rh(111), resulting in an alloyed surface with about 25% Ni in the topmost layers. One finds rate oscillations and chemical wave patterns comprising target patterns, pulse trains, and rotating spiral waves. The oscillatory behavior is attributed to periodic changes in the composition of the bimetallic surface alloy causing concomitant variations in catalytic activity. Under pattern-forming reaction conditions, three-dimensional NiO particles develop on top of the alloyed Rh/Ni surface, with dimensions ranging from <1 μm up to 50 μm. Their size which depends on the total pressure controls the Ni content in the surface alloy.
UR - http://www.scopus.com/inward/record.url?scp=84857411056&partnerID=8YFLogxK
U2 - 10.1021/jp209411t
DO - 10.1021/jp209411t
M3 - Article
AN - SCOPUS:84857411056
VL - 116
SP - 4083
EP - 4090
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 6
ER -