Growth of Stable Surface Oxides on Pt(111) at Near-Ambient Pressures.

Autor: Fantauzzi D; Institute of Electrochemistry, Ulm University, Albert-Einstein-Allee 47, 89069, Ulm, Germany.; Helmholtz Institute Ulm (HIU) Electrochemical Energy Storage, 89081, Ulm, Germany.; Karlsruhe Institute of Technology (KIT), P.O. Box 3640, 76021, Karlsruhe, Germany., Krick Calderón S; Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058, Erlangen, Germany., Mueller JE; Institute of Electrochemistry, Ulm University, Albert-Einstein-Allee 47, 89069, Ulm, Germany.; Helmholtz Institute Ulm (HIU) Electrochemical Energy Storage, 89081, Ulm, Germany.; Karlsruhe Institute of Technology (KIT), P.O. Box 3640, 76021, Karlsruhe, Germany., Grabau M; Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058, Erlangen, Germany., Papp C; Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058, Erlangen, Germany., Steinrück HP; Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058, Erlangen, Germany., Senftle TP; Department of Mechanical and Aereospace Engineering, Princeton University, Princeton, NJ, 08544-5263, USA., van Duin AC; Department of Mechanical and Nuclear Engineering, Pennsylvania State University, University Park, PA, 16801, USA., Jacob T; Institute of Electrochemistry, Ulm University, Albert-Einstein-Allee 47, 89069, Ulm, Germany.; Helmholtz Institute Ulm (HIU) Electrochemical Energy Storage, 89081, Ulm, Germany.; Karlsruhe Institute of Technology (KIT), P.O. Box 3640, 76021, Karlsruhe, Germany.
Jazyk: angličtina
Zdroj: Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2017 Mar 01; Vol. 56 (10), pp. 2594-2598. Date of Electronic Publication: 2017 Jan 25.
DOI: 10.1002/anie.201609317
Abstrakt: Detailed knowledge of the structure and degree of oxidation of platinum surfaces under operando conditions is essential for understanding catalytic performance. However, experimental investigations of platinum surface oxides have been hampered by technical limitations, preventing in situ investigations at relevant pressures. As a result, the time-dependent evolution of oxide formation has only received superficial treatment. In addition, the amorphous structures of many surface oxides have hindered realistic theoretical studies. Using near-ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) we show that a time scale of hours (t≥4 h) is required for the formation of platinum surface oxides. These experimental observations are consistent with ReaxFF grand canonical Monte Carlo (ReaxFF-GCMC) calculations, predicting the structures and coverages of stable, amorphous surface oxides at temperatures between 430-680 K and an O 2 partial pressure of 1 mbar.
(© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Databáze: MEDLINE
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