GRAIN BOUNDARIES IN DOPED-CERIA NANOFILMS USED AS ELECTROLYTES FOR IT-SOFC FUEL CELLS

MOJCA OTONICAR; NOEMÍ E. WALSÖE DE RECA; MARIO F. BIANCHETTI

ANALES DE LA ASOCIACIÓN QUÍMICA ARGENTINA

Asociación Química Argentina

Lugar: CABA; Año: 2018 vol. 105 p. 33 - 40

2545-8655

Ceria (CeO2) ceramics as doped with Y2O3 (CYO) or with Sm2O3 (CSO) are considered promisingmaterials as electrolytes for SOFCs Solid Oxide Fuel Cells due to their high conductivity by oxygen ions.The necessary requirements for fuel cells electrolytes are chemical stability, high conductivity,convenient sintering conditions, high density and absence of open porosity. In this work, the alreadystudied materials in some aspects by the authors: doped CeO2 with molar 10% samaria, was thermallytreated by fast-firing for a short time (3 min) at 850oC and at 1450oC to produce the material sintering.A complete planning of the fast-firing effects to understand these ceramics defects behavior isperformed at DEINSO-CITEDEF, studying: the grain growth, sintering velocity, changes in the grainboundaries, crystallites size measurements, pores density, densification and defects interaction. In thiswork, the fast-firing effect on grain boundaries structure is considered.This study also contributes to synthesize solid electrolytes with higher chemical stability and improvedquality. The ceramics characterization was performed by BET adsorption techniques, XRD, SEM andHRTEM.