Innovative improvement of sintered ceramic electrolytes by salt infiltration

Previously sintered (1500 °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 sa...

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Principais autores: Nascimento, Rubens Maribondo do, Grilo, João Paulo de Freitas, Macedo, Daniel Araújo de, Marques, Fernando Manuel Bico
Formato: article
Idioma:English
Publicado em: Elsevier
Assuntos:
Gd-doped ceria
Molten carbonates
Grain boundary
Impedance spectroscopy
Endereço do item:https://repositorio.ufrn.br/handle/123456789/45458
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spelling ri-123456789-454582024-03-19T04:02:07Z Innovative improvement of sintered ceramic electrolytes by salt infiltration Nascimento, Rubens Maribondo do Grilo, João Paulo de Freitas Macedo, Daniel Araújo de Marques, Fernando Manuel Bico Gd-doped ceria Molten carbonates Grain boundary Impedance spectroscopy Previously sintered (1500 °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 to 800 oC 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 °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 2030-12 2021-12-17T14:49:38Z 2021-02-15 article GRILO, João P. F.; MACEDO, Daniel A.; NASCIMENTO, Rubens M.; MARQUES, Fernando M. B. Innovative improvement of sintered ceramic electrolytes by salt infiltration. Ceramics International, [S.L.], v. 47, n. 4, p. 5079-5090, fev. 2021. Disponível em: https://www.sciencedirect.com/science/article/pii/S0272884220331291?via%3Dihub. Acesso em: 31 mar. 2021. http://dx.doi.org/10.1016/j.ceramint.2020.10.086. 0272-8842 https://repositorio.ufrn.br/handle/123456789/45458 10.1016/j.ceramint.2020.10.086 en Elsevier
institution Repositório Institucional
collection RI - UFRN
language English
topic Gd-doped ceria
Molten carbonates
Grain boundary
Impedance spectroscopy
spellingShingle Gd-doped ceria
Molten carbonates
Grain boundary
Impedance spectroscopy
Nascimento, Rubens Maribondo do
Grilo, João Paulo de Freitas
Macedo, Daniel Araújo de
Marques, Fernando Manuel Bico
Innovative improvement of sintered ceramic electrolytes by salt infiltration
description Previously sintered (1500 °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 to 800 oC 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 °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
format article
author Nascimento, Rubens Maribondo do
Grilo, João Paulo de Freitas
Macedo, Daniel Araújo de
Marques, Fernando Manuel Bico
author_facet Nascimento, Rubens Maribondo do
Grilo, João Paulo de Freitas
Macedo, Daniel Araújo de
Marques, Fernando Manuel Bico
author_sort Nascimento, Rubens Maribondo do
title Innovative improvement of sintered ceramic electrolytes by salt infiltration
title_short Innovative improvement of sintered ceramic electrolytes by salt infiltration
title_full Innovative improvement of sintered ceramic electrolytes by salt infiltration
title_fullStr Innovative improvement of sintered ceramic electrolytes by salt infiltration
title_full_unstemmed Innovative improvement of sintered ceramic electrolytes by salt infiltration
title_sort innovative improvement of sintered ceramic electrolytes by salt infiltration
publisher Elsevier
publishDate 2021
url https://repositorio.ufrn.br/handle/123456789/45458
work_keys_str_mv AT nascimentorubensmaribondodo innovativeimprovementofsinteredceramicelectrolytesbysaltinfiltration
AT grilojoaopaulodefreitas innovativeimprovementofsinteredceramicelectrolytesbysaltinfiltration
AT macedodanielaraujode innovativeimprovementofsinteredceramicelectrolytesbysaltinfiltration
AT marquesfernandomanuelbico innovativeimprovementofsinteredceramicelectrolytesbysaltinfiltration
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