Mainz 2017 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 5: Cluster

MS 5.1: Vortrag

Dienstag, 7. März 2017, 15:30–15:45, RW 2

The Oxidation of Cationic Tantalum Clusters Under Multi-Collision Conditions — •Martin Tschurl, Jan Frederik Eckhard, Tsugunosuke Masubuchi, Daniel Neuwirth, and Ueli Heiz — Technical University of Munich, Chair of Physical Chemistry, Lichtenbergstraße 4, 85748 Garching, Germany

Tantalum clusters and their oxides represent prospective materials for catalysis. In particular, they offer great potential as oxidation catalysts, as e.g. in the electrochemical oxygen evolution reaction or the methane activation. In this talk it will be shown, how the oxidation properties of tantalum clusters are governed by their size. It is found that three different species are formed depending on the number of atoms and the oxidation state of the clusters. For smaller clusters fully oxidized tantalum oxides result, whereas the oxidation of larger clusters favors the formation of species with an intact metal core. For the latter a second oxidation mechanism occurs of higher oxidation states, which is assigned to species for which the O-O bond remains intact. Furthermore, it is show how these results will contribute to future studies of ion-molecule reactions.