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  Enhancing Electrochemical Water-Splitting Kinetics by Polarization-Driven Formation of Near-Surface Iron(0): An In Situ XPS Study on Perovskite-Type Electrodes

Opitz, A. K., Nenning, A., Rameshan, C., Rameshan, R., Blume, R., Hävecker, M., et al. (2015). Enhancing Electrochemical Water-Splitting Kinetics by Polarization-Driven Formation of Near-Surface Iron(0): An In Situ XPS Study on Perovskite-Type Electrodes. Angewandte Chemie International Edition, 54(9), 2628-2635. doi:10.1002/anie.201409527.

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015 - BESSY beamtime Angew. Paper - ver.9.pdf (Any fulltext), 902KB
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 Creators:
Opitz, Alexander K.1, Author
Nenning, Andreas1, Author
Rameshan, Christoph2, Author
Rameshan, Raffael3, 4, Author              
Blume, Raoul3, 5, Author              
Hävecker, Michael3, 5, Author              
Knop-Gericke, Axel3, Author              
Rupprechter, Günther2, Author
Fleig, Jürgen1, Author
Klötzer, Bernhard4, Author
Affiliations:
1Vienna University of Technology, Institute of Chemical Technologies and Analytics, Getreidemarkt 9/164-EC, 1060 Vienna (Austria), ou_persistent22              
2Vienna University of Technology, Institute of Materials Chemistry, Getreidemarkt 9/165-PC, 1060 Vienna (Austria), ou_persistent22              
3Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
4University of Innsbruck, Institute of Physical Chemistry, Innrain 80-82, 6020 Innsbruck (Austria), ou_persistent22              
5Abt. Solarenergieforschung, Helmhotz-Zentrum Berlin, ou_persistent22              

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Free keywords: electrocatalysis; heterogeneous catalysis; perovskites; solid oxide electrolysis cells; thin-film electrodes
 Abstract: In the search for optimized cathode materials for high-temperature electrolysis, mixed conducting oxides are highly promising candidates. This study deals with fundamentally novel insights into the relation between surface chemistry and electrocatalytic activity of lanthanum ferrite based electrolysis cathodes. For this means, near-ambient-pressure X-ray photoelectron spectroscopy (NAP-XPS) and impedance spectroscopy experiments were performed simultaneously on electrochemically polarized La0.6Sr0.4FeO3−δ (LSF) thin film electrodes. Under cathodic polarization the formation of Fe0 on the LSF surface could be observed, which was accompanied by a strong improvement of the electrochemical water splitting activity of the electrodes. This correlation suggests a fundamentally different water splitting mechanism in presence of the metallic iron species and may open novel paths in the search for electrodes with increased water splitting activity.

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Language(s): eng - English
 Dates: 2014-09-262014-12-302015-02-23
 Publication Status: Published in print
 Pages: 5
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1002/anie.201409527
 Degree: -

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Title: Angewandte Chemie International Edition
  Abbreviation : Angew. Chem. Int. Ed.
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: 54 (9) Sequence Number: - Start / End Page: 2628 - 2635 Identifier: Other: 1521-3773
CoNE: https://pure.mpg.de/cone/journals/resource/0570-0833