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  On the Active Surface State of Nickel-Ceria Solid Oxide Fuel Cell Anodes During Methane Electrooxidation

Papaefthimiou, V., Shishkin, M., Niakolas, D. K., Athanasiou, M., Law, Y. T., Arrigo, R., et al. (2013). On the Active Surface State of Nickel-Ceria Solid Oxide Fuel Cell Anodes During Methane Electrooxidation. Advanced Energy Materials, 3(6), 762-769. doi:10.1002/aenm.201200727.

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 Urheber:
Papaefthimiou, Vasiliki1, Autor
Shishkin, Maxim2, Autor
Niakolas, Dimitris K.3, Autor
Athanasiou, Michalis3, Autor
Law, Yeuk Ting1, Autor
Arrigo, Rosa4, Autor           
Teschner, Detre4, Autor           
Hävecker, Michael4, 5, Autor           
Knop-Gericke, Axel4, Autor           
Schlögl, Robert4, Autor           
Ziegler, Tom2, Autor
Neophytides, Stylianos G.3, Autor
Zafeiratos, Spiros1, Autor           
Affiliations:
1Laboratoire LMSPC, UMR7515 CNRS-Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg, France, ou_persistent22              
2Department of Chemistry, University of Calgary, University Drive 2500, Calgary, Alberta T2N 1N4, Canada, ou_persistent22              
3FORTH/ICE-HT, GR-26504 Rion (Patras), Greece, ou_persistent22              
4Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
5Helmholtz-Zentrum Berlin fuer Materialien und Energy GmbH, Division Solar Energy Research, Elektronenspeicherring BESSY II, ou_persistent22              

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Schlagwörter: catalysis; composite materials; electrodes; electronic structures/processes/mechanisms; fuel cells
 Zusammenfassung: Solid oxide fuel cells (SOFCs) have grown in recognition as a viable technology able to convert chemical energy directly into electricity, with higher efficiencies than conventional thermal engines. Direct feeding of the SOFCs anode with hydrocarbons from fossil or renewable sources, appears more attractive compared to the use of hydrogen as a fuel. The addition of mixed oxide-ion/electron conductors, like gadolinium-doped ceria (GDC), to commonly used nickel-based anodes is a well–known strategy that significantly enhances the performance of the SOFCs. Here we provide in situ experimental evidence of the active surface oxidation state and composition of Ni/GDC anodes during methane electroxidation using realistic solid oxide electrode assemblies. Ambient pressure X-ray photoelectron and near edge X-ray absorption fine structure spectroscopies (APPES and NEXAFS respectively) combined with on line electrical and gas phase measurements, were used to directly associate the surface state and the electrocatalytic performance of Ni/GDC anodes working at intermediate temperatures (700°C). A reduced anode surface (Ce3+ and Ni), with an optimum Ni to Ce surface composition, were found to be the most favorable configuration for maximum cell currents. Experimental results are rationalized on the basis of first principles calculations, proposing a detailed mechanism of the cell function.

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Sprache(n): eng - English
 Datum: 2013-01-312013-06
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1002/aenm.201200727
 Art des Abschluß: -

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Titel: Advanced Energy Materials
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Weinheim : Wiley-VCH
Seiten: - Band / Heft: 3 (6) Artikelnummer: - Start- / Endseite: 762 - 769 Identifikator: Anderer: ISSN
CoNE: https://pure.mpg.de/cone/journals/resource/1614-6832