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The Electronic Interaction of Pt-Clusters with ITO and HOPG Surfaces upon Water Adsorption

Klett, Joachim and Krähling, Stephan and Elger, Benjamin and Schäfer, Rolf and Kaiser, Bernhard and Jaegermann, Wolfram (2014):
The Electronic Interaction of Pt-Clusters with ITO and HOPG Surfaces upon Water Adsorption.
In: Zeitschrift für Physikalische Chemie, De Gruyter, pp. 503-520, 228, (4-5), ISSN 0942-9352, [Online-Edition: http://dx.doi.org/10.1515/zpch-2013-0499],
[Article]

Abstract

n order to investigate the catalytic properties of supported platinum clusters, their interaction with water was monitored using photoelectron spectroscopy. The clusters were exposed to up to five Langmuir of water at cryogenic temperatures. Additionally, the influence of the substrate was studied by employing HOPG and ITO as complementary support materials. In contrast to bulk platinum a distinct chemical shift is observable in the Pt4f binding energies for Pt clusters deposited on ITO. The same clusters on HOPG show no changes in binding energy. We propose that this trend is due to a change in the surface Fermi level in ITO, hence highlighting the strong interaction between the platinum cluster and the substrate material. Therefore it is reasonable to assume, that the catalytic efficiency of these clusters in general can not solely be described by the electronic structure of the cluster alone, but that also the electronic changes induced in the substrate may have a major impact on the catalytic performance as well.

Item Type: Article
Erschienen: 2014
Creators: Klett, Joachim and Krähling, Stephan and Elger, Benjamin and Schäfer, Rolf and Kaiser, Bernhard and Jaegermann, Wolfram
Title: The Electronic Interaction of Pt-Clusters with ITO and HOPG Surfaces upon Water Adsorption
Language: English
Abstract:

n order to investigate the catalytic properties of supported platinum clusters, their interaction with water was monitored using photoelectron spectroscopy. The clusters were exposed to up to five Langmuir of water at cryogenic temperatures. Additionally, the influence of the substrate was studied by employing HOPG and ITO as complementary support materials. In contrast to bulk platinum a distinct chemical shift is observable in the Pt4f binding energies for Pt clusters deposited on ITO. The same clusters on HOPG show no changes in binding energy. We propose that this trend is due to a change in the surface Fermi level in ITO, hence highlighting the strong interaction between the platinum cluster and the substrate material. Therefore it is reasonable to assume, that the catalytic efficiency of these clusters in general can not solely be described by the electronic structure of the cluster alone, but that also the electronic changes induced in the substrate may have a major impact on the catalytic performance as well.

Journal or Publication Title: Zeitschrift für Physikalische Chemie
Volume: 228
Number: 4-5
Publisher: De Gruyter
Uncontrolled Keywords: Water, Splitting, Cluster, Catalysis, Platinum, ITO
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Surface Science
07 Department of Chemistry > Fachgebiet Anorganische Chemie
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
07 Department of Chemistry
Date Deposited: 27 Feb 2015 13:03
Official URL: http://dx.doi.org/10.1515/zpch-2013-0499
Additional Information:

Special Issue dedicated to Prof. Klaus Rademann on the occasion of his 60th birthday / Eckart Rühl and Helmut Baumgärtel, Berlin

Identification Number: doi:10.1515/zpch-2013-0499
Funders: Financial support of this project by the DFG priority program SPP 1613 aswell as by the DFG Excellence Initiative, DarmstadtGraduate School of Energy Science and Engineering (GSC 1070) is gratefully acknowledged., We also thank the Helmholtz-Zentrum Berlin Electron Storage Ring BESSY II for provision of synchrotron radiation at beamlines U49-2 and TGM 7 and support of the travel costs.
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