Time Resolved DXAS Study on Micro and Nano NiO/Ce0.9Gd0.1O1.95 Cermets for Intermediate Temperature Solid Oxide Fuel Cells

FERNANDEZ ZUVICH, A.; LARRONDO, S.; SALETA, M.; NAPOLITANO, F.; CANEIRO, A.; TROIANI, H.; LAMAS, D. G.; ARCE, M. D.; SERQUIS, A.; SOLDATI, A.

ECS Transactions

The Journal of the Electrochemical Society

Año: 2016 vol. 72 p. 215 - 224

1938-6737

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) analysis at 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.