INVESTIGADORES
MOGNI Liliana Veronica
artículos
Título:
Thermal stability of Ln2NiO4+d (Ln: La, Pr, Nd) and their chemical compatibility with YSZ and CGO solid electrolytes
Autor/es:
A. MONTENEGRO HERNÁNDEZ; J. VEGA-CASTILLO; L. MOGNI; A. CANEIRO
Revista:
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Lugar: Amsterdam; Año: 2011 vol. 36 p. 15704 - 15714
ISSN:
0360-3199
Resumen:
Thermal stability and chemical compatibility with electrolyte materials for Solid Oxide FuelCells (SOFC) have been studied on Ruddlesden-Popper nickelates Ln2NiO4+d with Ln: La, Prand Nd. Samples of each composition prepared by three different routes, were characterizedby X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). Differentmicrostructures were achieved by each preparation method. The thermal stability of thesecompounds was analyzed by annealing all the samples at 700 and 900 C in air. Pr2NiO4+d(PNO) decomposes after 24 h of annealing at 700 C confirming its instability at theseconditions. Evidences of chemical reaction between La2NiO4+d (LNO) and bothCe0.9Gd0.1O1.96 (CGO) and Zr0.92Y0.08O1.96 (YSZ) were observed at 700 and 900 C, respectively.No decomposition or chemical reaction with YSZ or CGO were found for Nd2NiO4þd (NNO)below 900 C. Nevertheless, reactivity with both electrolytes was found for this compoundat 1000 C. The kinetics of these reactions strongly depends on the microstructure ofLn2NiO4+d.
