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

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dc.identifier.uri http://dx.doi.org/10.15488/801
dc.identifier.uri http://www.repo.uni-hannover.de/handle/123456789/825
dc.contributor.author Smolinsky, T.
dc.contributor.author Homann, M.
dc.contributor.author Imbihl, R.
dc.date.accessioned 2016-12-06T07:56:24Z
dc.date.available 2016-12-06T07:56:24Z
dc.date.issued 2016
dc.identifier.citation Smolinsky, T.; Homann, M.; Imbihl, R.: Tuning excitability by alloying: the Rh(111)/Ni/H2 + O2 system. In: Physical chemistry chemical physics : PCCP 18 (2016), Nr. 2, S. 970-973. DOI: http://dx.doi.org/10.1039/C5CP06792H
dc.description.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 x 10(-5) mbar the bifurcation diagram has been mapped out as a function of the Ni coverage in a range of 0 ML </= Theta(Ni) >/= 1.3 ML. A critical Ni coverage of Theta(Ni,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 Theta(Ni) = 0.13 ML to Theta(Ni) = 1.3 ML. eng
dc.description.sponsorship DFG
dc.language.iso eng
dc.publisher Cambridge : Royal Society of Chemistry
dc.relation.ispartofseries Physical Chemistry Chemical Physics 18 (2016), Nr. 2
dc.rights Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden. Dieser Beitrag ist aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
dc.subject O2 eng
dc.subject H2 eng
dc.subject physical chemistry eng
dc.subject Bimetallic catalysts eng
dc.subject.ddc 540 | Chemie ger
dc.title Tuning excitability by alloying: the Rh(111)/Ni/H2 + O2 system
dc.type article
dc.type Text
dc.relation.essn 1463-9084
dc.relation.issn 1463-9076
dc.relation.doi http://dx.doi.org/10.1039/C5CP06792H
dc.bibliographicCitation.issue 2
dc.bibliographicCitation.volume 18
dc.bibliographicCitation.firstPage 970
dc.bibliographicCitation.lastPage 973
dc.description.version publishedVersion
tib.accessRights frei zug�nglich


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