Innovative improvement of sintered ceramic electrolytes by salt infiltration
authors Grilo, JPF; Macedo, DA; Nascimento, RM; Marques, FMB
nationality International
journal CERAMICS INTERNATIONAL
author keywords Gd-doped ceria; Molten carbonates; Grain boundary; Impedance spectroscopy
keywords GRAIN-BOUNDARY CONDUCTIVITY; DOPED CERIA; ELECTRICAL-CONDUCTIVITY; SOLID ELECTROLYTES; LITHIUM-OXIDE; SPACE-CHARGE; BEHAVIOR; CARBONATES; STABILITY; AID
abstract Previously sintered (1500 degrees C, 4 h) dense pellets of Ce0.9Gd0.1O1.95 (GDC) were covered and heat treated with eutectic mixtures of Na2CO3 and Li2CO3 (NLC), and their electrical performance was assessed against pure GDC and chemically synthesized GDC + NLC. Microstructural analysis of NLC impregnated samples confirmed slight migration of the molten phase to the interior of the GDC pellets via grain boundaries, resulting in a significant improvement of the grain boundary conductivity, increasing with duration of heat treatment (0.5-2 h) and temperature (600-800 degrees C range). The observed total conductivity exceeded in almost 20% the corresponding values obtained for standard GDC samples. Cells tested before and after direct current polarization (0.5 V, 500 degrees C) showed the same electrical performance, discarding the possibility of parallel contributions of salt ions to the total conductivity. Grain boundary engineering using salt infiltration is an effective tool to improve the electrical performance of ceramic electrolytes.
publisher ELSEVIER SCI LTD
issn 0272-8842
isbn 1873-3956
year published 2021
volume 47
issue 4
beginning page 5079
ending page 5090
digital object identifier (doi) 10.1016/j.ceramint.2020.10.086
web of science category 12
subject category Materials Science, Ceramics
unique article identifier WOS:000608688100004
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