Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 13: Magnetic Materials
MA 13.11: Vortrag
Montag, 26. März 2012, 17:45–18:00, H 0112
(contribution withdrawn) Surface magnetism of RuO2 (110): implications for electro-catalysis — Chang-Ming Fang1, •Engin Torun1, Gilles A de Wijs1, and Robert A de Groot1,2 — 1Radboud University Nijmegen, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ, Nijmegen, The Netherlands. — 2Laboratory of Chemical Physics, Zernike Institute of Advanced Materials, Nijenborgh 4, NL-9747 AG Groningen, The Netherlands.
Chemical reactions, where one of the reactants is magnetic, are slow because of the violation of the conservation of angular momentum. Production of hydrogen by electrolysis of water can be considered as an archetype example of such reactions: practically all losses occur in the production of magnetic oxygen. Anodes with a relatively low overvoltage (a measure of the losses) are based on the ruthenium-dioxide (110) surface. First-principles electronic structure calculations reported here show that this surface itself carries magnetic moments, which is a rare situation for 4d metals and their compounds, and it is the only surface of low index to do so. This surface enables the production of oxygen conserving angular momentum.