Person:
Martínez De Irujo Labalde, Xabier

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First Name
Xabier
Last Name
Martínez De Irujo Labalde
URI
https://hdl.handle.net/20.500.14352/86806
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Químicas
Department
Química Inorgánica
Area
Química Inorgánica
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2016 - 201912020 - 20211
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Author: García Martín, Susana × Has files: false ×

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    Complex modulation of the crystal structure of a layered perovskite. A promising solid-oxide-fuelcell cathode
    (Journal of Materials Chemistry A, 2016) Martínez De Irujo Labalde, Xabier; Muñoz Gil, Daniel; Urones Garrote, Esteban; Ávila Brande, David; García Martín, Susana
    Layered-type perovskites have been the focus of research in the last few years due to their outstanding properties as solid oxide fuel cell oxygen electrodes. The synthesis of a new (GdBa)0.8Ca0.4Co0.6Fe1.4O6-d layered perovskite as a single phase as well as the crystal structure determination and catalytic activity for oxygen reduction is reported. Highly advanced methods of transmission electron microscopy have been used for structure determination at atomic resolution. The oxide shows a complex modulation of the crystal structure associated with layered-type ordering of the Gd, Ba and Ca atoms in combination with formation of different coordination polyhedra of the Fe and Co atoms. Location of the anion vacancies within particular highly ion-conducting layers of the crystal structure has been achieved by phase image reconstruction. This material exhibits excellent electrochemical behaviour and thermal stability for use as an air electrode in IT-SOFCs.
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    YBaCuO-type perovskites as potential air electrodes for SOFCs. The case of YSr2Cu2FeO7+δ
    (Journal of Materials Chemistry A, 2021) López Paz, Sara Almudena; Marín Gamero, Rafael; Martínez De Irujo Labalde, Xabier; Sánchez Marcos, Jorge; Perez Coll, Domingo; Alario y Franco, Miguel Ángel; García Martín, Susana
    The electrochemical properties of YSr2Cu2FeO7+d with YBaCuO-type structure have been studied. The temperature dependent oxygen content of this oxide has a marked influence on its p-type conducting behavior, since topochemical oxygen release occurs on heating above 673 K while reversible oxygen uptake takes place on cooling. Mixed valence Fe3+/Fe4+ and Cu2+/Cu3+ in combination with anion vacancies within the oxygen-sublattice suggest mixed (electronic and ionic) conductivity in this oxide. Electrochemical measurements indicate that YSr2Cu2FeO7+d shows high oxygen reduction reaction activity at intermediate temperatures, revealing its potential applications as an air electrode in SOFCs.