Details
| Original language | English |
|---|---|
| Pages (from-to) | 970-973 |
| Number of pages | 4 |
| Journal | Physical Chemistry Chemical Physics |
| Volume | 18 |
| Issue number | 2 |
| Publication status | Published - 30 Nov 2016 |
Abstract
The dynamic behavior of the O2 + H2 reaction on a Rh(111) surface alloyed with Ni has been studied in the 10-5 mbar range using photoemission electron microscopy (PEEM) as a spatial resolving method. For T = 773 K and p(O2) = 5 × 10-5 mbar the bifurcation diagram has been mapped out as a function of the Ni coverage in a range of 0 ML ≤ ΘNi ≥ 1.3 ML. A critical Ni coverage of ΘNi,crit = 0.13 monolayers (ML) is required for excitability. In the excitable parameter range pulse trains and irregular chemical wave patterns are found. Whereas the propagation speed of the pulses exhibits no clear-cut dependence on the Ni coverage, the frequency of the local PEEM intensity oscillations increases linearly with Ni coverage in the range from ΘNi = 0.13 ML to ΘNi = 1.3 ML.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- General Physics and Astronomy
- Chemistry(all)
- Physical and Theoretical Chemistry
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In: Physical Chemistry Chemical Physics, Vol. 18, No. 2, 30.11.2016, p. 970-973.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Tuning excitability by alloying
T2 - The Rh(111)/Ni/H2 + O2 system
AU - Smolinsky, T.
AU - Homann, M.
AU - Imbihl, R.
N1 - Funding Information: The authors are indebted to the Deutsche Forschungsgemeinschaft (DFG) for its financial support.
PY - 2016/11/30
Y1 - 2016/11/30
N2 - The dynamic behavior of the O2 + H2 reaction on a Rh(111) surface alloyed with Ni has been studied in the 10-5 mbar range using photoemission electron microscopy (PEEM) as a spatial resolving method. For T = 773 K and p(O2) = 5 × 10-5 mbar the bifurcation diagram has been mapped out as a function of the Ni coverage in a range of 0 ML ≤ ΘNi ≥ 1.3 ML. A critical Ni coverage of ΘNi,crit = 0.13 monolayers (ML) is required for excitability. In the excitable parameter range pulse trains and irregular chemical wave patterns are found. Whereas the propagation speed of the pulses exhibits no clear-cut dependence on the Ni coverage, the frequency of the local PEEM intensity oscillations increases linearly with Ni coverage in the range from ΘNi = 0.13 ML to ΘNi = 1.3 ML.
AB - The dynamic behavior of the O2 + H2 reaction on a Rh(111) surface alloyed with Ni has been studied in the 10-5 mbar range using photoemission electron microscopy (PEEM) as a spatial resolving method. For T = 773 K and p(O2) = 5 × 10-5 mbar the bifurcation diagram has been mapped out as a function of the Ni coverage in a range of 0 ML ≤ ΘNi ≥ 1.3 ML. A critical Ni coverage of ΘNi,crit = 0.13 monolayers (ML) is required for excitability. In the excitable parameter range pulse trains and irregular chemical wave patterns are found. Whereas the propagation speed of the pulses exhibits no clear-cut dependence on the Ni coverage, the frequency of the local PEEM intensity oscillations increases linearly with Ni coverage in the range from ΘNi = 0.13 ML to ΘNi = 1.3 ML.
UR - http://www.scopus.com/inward/record.url?scp=84952342492&partnerID=8YFLogxK
U2 - 10.1039/c5cp06792h
DO - 10.1039/c5cp06792h
M3 - Article
AN - SCOPUS:84952342492
VL - 18
SP - 970
EP - 973
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
SN - 1463-9076
IS - 2
ER -