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Halogen Phases on Pd(110)

Autor(en)
Peter Amann, Michael Cordin, Thomas Goetsch, Alexander Menzel, Erminald Bertel, Josef Redinger, Cesare Franchini
Abstrakt

Halogens are used as modifiers in catalytic processes, notably including photocatalytic watersplitting; as redox-active species in dye-sensitized solar cells; and as etchants in device fabrication. Atomically resolved studies of the adsorption and reactivity of halogens on Pt and Pd surfaces are scarce in view of the prominent role these metals play in the mentioned applications. The present study reports phases of halogens on Pd(110) in the submonolayer coverage range as monitored by temperature-programmed desorption, low-energy electron diffraction, scanning tunneling microscopy, and density functional calculations. Domain wall and compression structures are observed, as is typical for halogens (except fluorine) on transition and noble metals, but not on Pt, where the bonding is much more site-specific and a different succession of phases is found. The reactivity of Br toward Pd(110) is greater than that of Cl, as judged by the corrosive attack and by the bond strength derived from the thermal desorption temperature. The results confirm that an ionic-bonding picture based on a large metal-to-halogen charge transfer is not valid for Pd and Pt. Rather, the bonding is predominantly covalent, and the reactivity does not obey simple intuitive rules.

Organisation(en)
Computergestützte Materialphysik
Externe Organisation(en)
Leopold-Franzens-Universität Innsbruck, Technische Universität Wien
Journal
The Journal of Physical Chemistry Part C (Nanomaterials and Interfaces)
Band
119
Seiten
3613-3623
Anzahl der Seiten
11
ISSN
1932-7447
DOI
https://doi.org/10.1021/jp512268u
Publikationsdatum
02-2015
Peer-reviewed
Ja
ÖFOS 2012
103025 Quantenmechanik, 103036 Theoretische Physik, 103015 Kondensierte Materie, 103009 Festkörperphysik
Schlagwörter
ASJC Scopus Sachgebiete
Electronic, Optical and Magnetic Materials, Allgemeine Energie, Surfaces, Coatings and Films, Physical and Theoretical Chemistry
Link zum Portal
https://ucrisportal.univie.ac.at/de/publications/974f4992-b061-40c7-8fab-3242877e34bc