Innovative improvement of sintered ceramic electrolytes by salt infiltration

Detalhes bibliográficos
Autor(a) principal: Grilo, João P.F.
Data de Publicação: 2021
Outros Autores: Macedo, Daniel A., Nascimento, Rubens M., Marques, Fernando M.B.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10773/37319
Resumo: 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 (600–800 °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 °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.
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spelling Innovative improvement of sintered ceramic electrolytes by salt infiltrationGd-doped ceriaMolten carbonatesGrain boundaryImpedance spectroscopyPreviously 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 (600–800 °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 °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.Elsevier2023-04-24T12:00:39Z2021-02-15T00:00:00Z2021-02-15info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10773/37319eng0272-884210.1016/j.ceramint.2020.10.086Grilo, João P.F.Macedo, Daniel A.Nascimento, Rubens M.Marques, Fernando M.B.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-02-22T12:12:02Zoai:ria.ua.pt:10773/37319Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:07:56.951206Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Innovative improvement of sintered ceramic electrolytes by salt infiltration
title Innovative improvement of sintered ceramic electrolytes by salt infiltration
spellingShingle Innovative improvement of sintered ceramic electrolytes by salt infiltration
Grilo, João P.F.
Gd-doped ceria
Molten carbonates
Grain boundary
Impedance spectroscopy
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
author Grilo, João P.F.
author_facet Grilo, João P.F.
Macedo, Daniel A.
Nascimento, Rubens M.
Marques, Fernando M.B.
author_role author
author2 Macedo, Daniel A.
Nascimento, Rubens M.
Marques, Fernando M.B.
author2_role author
author
author
dc.contributor.author.fl_str_mv Grilo, João P.F.
Macedo, Daniel A.
Nascimento, Rubens M.
Marques, Fernando M.B.
dc.subject.por.fl_str_mv Gd-doped ceria
Molten carbonates
Grain boundary
Impedance spectroscopy
topic Gd-doped ceria
Molten carbonates
Grain boundary
Impedance spectroscopy
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 (600–800 °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 °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.
publishDate 2021
dc.date.none.fl_str_mv 2021-02-15T00:00:00Z
2021-02-15
2023-04-24T12:00:39Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10773/37319
url http://hdl.handle.net/10773/37319
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 0272-8842
10.1016/j.ceramint.2020.10.086
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv
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