Reactivity of atomically dispersed Pt2+ species towards H-2: model Pt-CeO2 fuel cell catalyst
Lykhach Y, Figueroba A, Camellone MF, Neitzel A, Skala T, Negreiros FR, Vorokhta M, Tsud N, Prince KC, Fabris S, Neyman KM, Matolin V, Libuda J (2016)
Publication Status: Published
Publication Type: Journal article
Publication year: 2016
Journal
Publisher: ROYAL SOC CHEMISTRY
Book Volume: 18
Pages Range: 7672-7679
Journal Issue: 11
DOI: 10.1039/c6cp00627b
Abstract
The reactivity of atomically dispersed Pt2+ species on the surface of nanostructured CeO2 films and the mechanism of H-2 activation on these sites have been investigated by means of synchrotron radiation photoelectron spectroscopy and resonant photoemission spectroscopy in combination with density functional calculations. Isolated Pt2+ sites are found to be inactive towards H-2 dissociation due to high activation energy required for H-H bond scission. Trace amounts of metallic Pt are necessary to initiate H-2 dissociation on Pt-CeO2 films. H-2 dissociation triggers the reduction of Ce4+ cations which, in turn, is coupled with the reduction of Pt2+ species. The mechanism of Pt2+ reduction involves reverse oxygen spillover and formation of oxygen vacancies on Pt-CeO2 films. Our calculations suggest the existence of a threshold concentration of oxygen vacancies associated with the onset of Pt2+ reduction.
Authors with CRIS profile
Yaroslava Lykhach
Lehrstuhl für Physikalische Chemie II
Armin Neitzel
Lehrstuhl für Physikalische Chemie II
Jörg Libuda
Professur für Physikalische Chemie
Additional Organisation(s)
Involved external institutions
Elettra Sincrotrone Trieste S.C.p.A.
Italy (IT)
Univerzita Karlova v Praze / Charles University in Prague
Czech Republic (CZ)
Consiglio Nazionale delle Ricerche (CNR) / National Research Council of Italy
Italy (IT)
Universitat de Barcelona (UB) / University of Barcelona
Spain (ES)
Italy (IT)
Univerzita Karlova v Praze / Charles University in Prague
Czech Republic (CZ)
Consiglio Nazionale delle Ricerche (CNR) / National Research Council of Italy
Italy (IT)
Universitat de Barcelona (UB) / University of Barcelona
Spain (ES)
How to cite
APA:
Lykhach, Y., Figueroba, A., Camellone, M.F., Neitzel, A., Skala, T., Negreiros, F.R.,... Libuda, J. (2016). Reactivity of atomically dispersed Pt2+ species towards H-2: model Pt-CeO2 fuel cell catalyst. Physical Chemistry Chemical Physics, 18(11), 7672-7679. https://dx.doi.org/10.1039/c6cp00627b
MLA:
Lykhach, Yaroslava, et al. "Reactivity of atomically dispersed Pt2+ species towards H-2: model Pt-CeO2 fuel cell catalyst." Physical Chemistry Chemical Physics 18.11 (2016): 7672-7679.
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