Tuning excitability by alloying: The Rh(111)/Ni/H2 + O2 system

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Autoren

  • T. Smolinsky
  • M. Homann
  • R. Imbihl
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Details

OriginalspracheEnglisch
Seiten (von - bis)970-973
Seitenumfang4
FachzeitschriftPhysical Chemistry Chemical Physics
Jahrgang18
Ausgabenummer2
PublikationsstatusVeröffentlicht - 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.

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Tuning excitability by alloying: The Rh(111)/Ni/H2 + O2 system. / Smolinsky, T.; Homann, M.; Imbihl, R.
in: Physical Chemistry Chemical Physics, Jahrgang 18, Nr. 2, 30.11.2016, S. 970-973.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Smolinsky T, Homann M, Imbihl R. Tuning excitability by alloying: The Rh(111)/Ni/H2 + O2 system. Physical Chemistry Chemical Physics. 2016 Nov 30;18(2):970-973. doi: 10.1039/c5cp06792h, 10.15488/801
Smolinsky, T. ; Homann, M. ; Imbihl, R. / Tuning excitability by alloying : The Rh(111)/Ni/H2 + O2 system. in: Physical Chemistry Chemical Physics. 2016 ; Jahrgang 18, Nr. 2. S. 970-973.
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AU - Homann, M.

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N1 - Funding Information: The authors are indebted to the Deutsche Forschungsgemeinschaft (DFG) for its financial support.

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