La1.98Ni04±δ, a new cathode material for solid oxide fuel cell: Impedance spectroscopy study and compatibility with gadolinia-doped ceria and yttria-stabilized zirconia electrolytes
| Autor: | L. Zerroual, Armelle Ringuedé, A. Khaled, Michel Cassir, Mosbah Ferkhi |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
biology General Chemical Engineering Non-blocking I/O Inorganic chemistry Oxide Electrolyte biology.organism_classification Dielectric spectroscopy chemistry.chemical_compound chemistry Chemical engineering Electrochemistry Lanio Cubic zirconia Solid oxide fuel cell Yttria-stabilized zirconia |
| Zdroj: | Electrochimica Acta. 75:80-87 |
| ISSN: | 0013-4686 |
| DOI: | 10.1016/j.electacta.2012.04.064 |
| Popis: | A new SOFC cathode material, La 1.98 NiO 4± δ , was tested in presence of two electrolytes, yttria-stabilized zirconia (YSZ) and gadolinia-doped ceria (GDC). XRD analysis showed the absence of undesirable phases at the La 1.98 NiO 4± δ /GDC interface, whereas lanthanum zirconate (La 2 Zr 2 O 7 ), an insulating phase, is present between electrode La 1.98 NiO 4± δ and YSZ electrolyte. XPS analysis showed that the oxygen lattice can be present in form of La O and LaNiO 3 , which explains the high conductivity for these materials. At temperatures lower than 650 °C, the area specific resistance of the electrodes, measured by electrochemical impedance spectroscopy is significantly inferior when associated to GDC rather than YSZ electrolyte. In addition, in the case of GDC, a lower activation energy of about 0.7 eV was obtained, which could be explained by a higher mobility of oxide ions at the La 1.98 NiO 4± δ /GDC interface compared to the La 1.98 NiO 4± δ /YSZ one. |
| Databáze: | OpenAIRE |
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