Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 40: Solid-Liquid Interfaces
O 40.3: Poster
Dienstag, 17. März 2015, 18:15–21:00, Poster A
Electrochemistry of natural polycrystalline vs natural single crystal magnetite — •Diana Hötger1, Santiago Herrera1,2, Doris Grumelli1, Benjamin Wurster1, Peter Jacobson1, Rico Gutzler1, Ernesto Calvo2, and Klaus Kern1,3 — 1Max Planck Institute for Solid State Research, Stuttgart, Germany — 2Departamento de Química inorgánica, analítica y fisicoquímica, INQUIMAE, Univerdidad de Buenos Aires, Argentina — 3Institute de Physique de la Matière Condensée, EPFL, Lausanne, Switzerland
Metal oxides have attracted a lot of interest in catalytic research as a cheap alternative to noble metal devices used in present applications. The electrochemistry of natural polycrystalline magnetite (Fe3O4) and their reactivity towards oxygen reduction reaction (ORR) has been widely studied [1,2]. Electrocatalysis is a surface dependent process, as surface composition, structure, and defects govern the electrochemical response. For a better understanding of the mechanisms and to improve the efficiency of electrocatalysts, it is crucial to work with very well defined surfaces. Electrochemistry of Fe3O4(001) single crystal surfaces prepared under ultra-high vacuum (UHV) conditions has previously been reported [3]. Here we expand this research and compare the electrochemistry of UHV prepared Fe3O4(001) single crystals with polycrystalline Fe3O4 by using a specially designed transfer system between UHV and electrochemical environment.
[1] P. A. Castro et al., J. Chem. Soc. Faraday Trans. 1996, 92, 3371.
[2] E. J. Calvo, Mater. Corros. 2014, 65, 345–350.
[3] R.Bliem et al., 2014, doi: 10.1126/science.1260556.