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Catalysts 2014, 4(2), 129-145; doi:10.3390/catal4020129
Article

In Situ XANES/XPS Investigation of Doped Manganese Perovskite Catalysts

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Received: 14 February 2014; in revised form: 26 March 2014 / Accepted: 1 April 2014 / Published: 23 April 2014
(This article belongs to the Special Issue Perovskite Catalysts)
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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−xCaxMnO3) 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.
Keywords: catalysis; oxygen evolution; manganese perovskite; Pr1−xCaxMnO3; XANES; XPS; Mn L-edge; active state; oxygen vacancies; surface valence catalysis; oxygen evolution; manganese perovskite; Pr1−xCaxMnO3; XANES; XPS; Mn L-edge; active state; oxygen vacancies; surface valence
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Mierwaldt, D.; Mildner, S.; Arrigo, R.; Knop-Gericke, A.; Franke, E.; Blumenstein, A.; Hoffmann, J.; Jooss, C. In Situ XANES/XPS Investigation of Doped Manganese Perovskite Catalysts. Catalysts 2014, 4, 129-145.

AMA Style

Mierwaldt D, Mildner S, Arrigo R, Knop-Gericke A, Franke E, Blumenstein A, Hoffmann J, Jooss C. In Situ XANES/XPS Investigation of Doped Manganese Perovskite Catalysts. Catalysts. 2014; 4(2):129-145.

Chicago/Turabian Style

Mierwaldt, Daniel; Mildner, Stephanie; Arrigo, Rosa; Knop-Gericke, Axel; Franke, Emanuel; Blumenstein, Andreas; Hoffmann, Jörg; Jooss, Christian. 2014. "In Situ XANES/XPS Investigation of Doped Manganese Perovskite Catalysts." Catalysts 4, no. 2: 129-145.


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