INVESTIGADORES
MOGNI Liliana Veronica
artículos
Título:
Review on Ceramic Interphases by Transmission and Scanning Electron Microscopy
Autor/es:
A. SOLDATI; A. MONTENEGRO HERNÁNDEZ; L. BAQUE; H. TROIANI; L. MOGNI; A. SCHREIBER ; A. SERQUIS
Revista:
PRAKTISCHE METALLOGRAPHIE
Editorial:
CARL HANSER VERLAG
Referencias:
Lugar: Berlin, Germany; Año: 2014 vol. 51 p. 675 - 688
ISSN:
0032-678X
Resumen:
The Focused Ion Beam (FIB) technique was used to prepare site-specific samples frominterfacial regions of different solid oxide fuel cells assemblies. Transmission andScanning Electron Microscopy on the FIB foils combined with Electrochemical Im-pedance Spectroscopy (EIS) allowed the characterization of the electrode/electro-lyte interphases and the determination of its influence on the cell performance afterlong-term operation conditions. This work reviews two cases: on one hand, Ln2NiO4+d(Ln= La, Nd) cathodes deposited on both Y0.08Zr0.92O1.96 and Ce0.9Gd0.1O1.95 electroytes, that react at 900 °C during the adhesion treatment and at temperatures higherthan 650 °C during the EIS measurements.These samples present a reaction layer of 10 nm thickness, which contains elementsof both phases and was found responsible of the cell performance degradation.On the other hand, La0.4Sr0.6Co0.8Fe0.2O3-δcathodes showed excelent performanceon Ceria electrolytes, even after 1 000 h at operation conditions. In that case, the mi-croscopic analyses of FIB foils showed a semi-coherent interphase growth.
