Assessment of processing route on the performance of ceria-based composites
authors Grilo, JPF; Macedo, DA; Nascimento, RM; Marques, FMB
nationality International
author keywords alkali metal carbonates; ceria; composites; electronic conductivity; percolation
abstract Gd-doped ceria (GDC)-based composites, including a eutectic mixture of lithium and sodium carbonate (NLC) as second phase, were prepared using several processing routes, namely chemical synthesis, co-firing of both phases, or impregnation of a presintered porous matrix. LiAlO2-based composites were also prepared and used as reference. The structural, microstructural, and electrical properties (impedance spectroscopy in air, up to 700 degrees C) of these materials were assessed in detail. A limited set of compositions was also used in measurements of total electrical conductivity at different oxygen partial pressures (from 0.21 to <10(-25) atm), in the 600 degrees C to 700 degrees C range. The results obtained confirmed the enormous impact of the processing route on the percolation of the ceramic phase. In the exploited range of operating conditions, GDC-NLC composites prepared by infiltration of molten carbonates within a mechanically robust ceramic matrix exhibit a high total ionic conductivity strongly influenced by the contribution of the molten salt while the ceramic phase is decisive in the appearance of a significant component of electronic conductivity under reducing conditions.
publisher WILEY
issn 0363-907X
isbn 1099-114X
year published 2021
volume 45
issue 6
beginning page 9069
ending page 9082
digital object identifier (doi) 10.1002/er.6438
web of science category 14
subject category Energy & Fuels; Nuclear Science & Technology
unique article identifier WOS:000613940100001
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