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Article

In Situ XANES/XPS Investigation of Doped Manganese Perovskite Catalysts

1
Institut für Materialphysik, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
2
Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
*
Author to whom correspondence should be addressed.
Catalysts 2014, 4(2), 129-145; https://doi.org/10.3390/catal4020129
Received: 14 February 2014 / Revised: 26 March 2014 / Accepted: 1 April 2014 / Published: 23 April 2014
(This article belongs to the Special Issue Perovskite Catalysts)
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. View Full-Text
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
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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. https://doi.org/10.3390/catal4020129

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. https://doi.org/10.3390/catal4020129

Chicago/Turabian Style

Mierwaldt, Daniel, Stephanie Mildner, Rosa Arrigo, Axel Knop-Gericke, Emanuel Franke, Andreas Blumenstein, Jörg Hoffmann, and Christian Jooss. 2014. "In Situ XANES/XPS Investigation of Doped Manganese Perovskite Catalysts" Catalysts 4, no. 2: 129-145. https://doi.org/10.3390/catal4020129

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