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In Situ XANES/XPS Investigation of Doped Manganese Perovskite Catalysts

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Arrigo,  Rosa
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Knop-Gericke,  Axel
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Mierwaldt, D., Mildner, S., Arrigo, R., Knop-Gericke, A., Franke, E., Blumenstein, A., et al. (2014). In Situ XANES/XPS Investigation of Doped Manganese Perovskite Catalysts. Special Issue "Perovskite Catalysts". doi:10.3390/catal4020129.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0018-BBE2-8
Abstract
Studying catalysts in situ is of high interest for understanding their surface structure and electronic states in operation. Herein, we present a study of epitaxial manganite perovskite thin films (Pr1-xCax MnO3) active for the oxygen evolution reaction (OER) from electro-catalytic water splitting. X-ray absorption near-edge spectroscopy (XANES) at the Mn L- and O K-edges, as well as X-ray photoemission spectroscopy (XPS) of the O 1s and Ca 2p states have been performed in ultra-high vacuum and in water vapor under positive applied bias at room temperature. It is shown that under the oxidizing conditions of the OER a reduced Mn2+ species is generated at the catalyst surface. The Mn valence shift is accompanied by the formation of surface oxygen vacancies. Annealing of the catalysts in O2 atmosphere at 120 °C restores the virgin surfaces.