Time Resolved DXAS Study on Micro and Nano NiO/Ce0.9Gd0.1O1.95 Cermets for Intermediate Temperature Solid Oxide Fuel Cells
- Fernandez Zuvich, Afra
- Larrondo, Susana Adelina
- Saleta, Martin
- Napolitano, Federico Ricardo
- Caneiro, Alberto
- Troiani, Horacio Esteban
- Lamas, Diego Germán
- Arce, Mauricio Damián
- Serquis, Adriana Cristina
- Soldati, Analía Leticia
DOIAbstract
We present a crystallographic, morphologic and redox dynamic study on (60:40) NiO/Ce0.9Gd0.1O1.95 (NiO/GDC) cermets simulating Intermediate Temperature Solid Oxide Fuel Cells (IT-SOFC) anodes in situ conditions. We tested micro- and nanometer sized materials at 700ºC in three different atmospheres (5% H2, 5% O2 and 20% CH4). We used Dispersive X-ray Absorption Spectroscopy (DXAS) analysisat the Ce L3-edge and at the Ni K-edge to follow the metal´s oxidation states. A correlation between the catalytic/redox properties and the sample´s characteristics (microstructure, Ni distribution, etc.) was found, indicating that nanometric sized particles showed faster and higher reduction extents than micrometric particles of the same composition.Fil: F...
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