Improvement on the electrochemical performance by morphology control of nanostructured La0.6Sr0.4CoO3-δ-Gd0.1Ce0.9O1.95cathodes for IT-SOFC

Autores
Acuña, Leandro Marcelo; Cabezas, Marcelo Daniel; Fuentes, Rodolfo Oscar
Año de publicación
2022
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The effect of the particle's shape of Gd0.1Ce0.9O2-d (GDC) nanopowders on the electrochemical performance of La0.6Sr0.4CoO3-δ (LSC)-GDC composite cathodes was experimentally studied by electrochemical impedance spectroscopy (EIS). Composites were made of nanostructured LSC perovskite (average crystallite size D = 30 nm) mixed with nanostructured GDC powder (D = 8 nm) of irregular particle shape or with spherical particles of 200 nm diameter. Symmetrical cells (cathode/electrolyte/cathode) with different weight ratios of LSC:GDC (100: 0, 75 : 25, 50: 50 and 25 : 75 wt%) thick cathodes were fabricated by the screen-printing method and tested by EIS in the temperature range of 500-700 °C under a synthetic air flow of 100 mL min-1. These nanostructured composite materials exhibited excellent performance (area-specific resistance - ASR - values in the range of 0.019-0.032 Ω cm2 for an operating temperature of 700 °C). The best performance was achieved at a weight ratio of 75 : 25 wt% (LSC:GDC) when nanostructured GDC spheres were employed. This enhanced performance can be attributed to GDC morphology along with GDC anionic conduction, which prevent the blocking of LSC electrochemical reaction sites on surface, keeping them active by depleting its surface of adsorbed and reduced oxygen. The limiting processes were determined to take place on the LSC surface. New insight on cobalt's speciation under working-like conditions, determined by in situ X-ray Absorption Spectroscopy (XAS) experiments, suggests that the ease of cobalt atoms for changing their oxidation state is the key feature that rules the electrochemical activity of LSC and an atomistic model that explains it is proposed.
Fil: Acuña, Leandro Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Investigación y Desarrollo Estratégico para la Defensa. Ministerio de Defensa. Unidad de Investigación y Desarrollo Estratégico para la Defensa; Argentina
Fil: Cabezas, Marcelo Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Investigación y Desarrollo Estratégico para la Defensa. Ministerio de Defensa. Unidad de Investigación y Desarrollo Estratégico para la Defensa; Argentina
Fil: Fuentes, Rodolfo Oscar. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Constituyentes | Comision Nacional de Energia Atomica. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Constituyentes.; Argentina
Materia
Cathodes
SOFC
EIS
XAS
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/216877
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/216877
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Improvement on the electrochemical performance by morphology control of nanostructured La0.6Sr0.4CoO3-δ-Gd0.1Ce0.9O1.95cathodes for IT-SOFCAcuña, Leandro MarceloCabezas, Marcelo DanielFuentes, Rodolfo OscarCathodesSOFCEISXAShttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1The effect of the particle's shape of Gd0.1Ce0.9O2-d (GDC) nanopowders on the electrochemical performance of La0.6Sr0.4CoO3-δ (LSC)-GDC composite cathodes was experimentally studied by electrochemical impedance spectroscopy (EIS). Composites were made of nanostructured LSC perovskite (average crystallite size D = 30 nm) mixed with nanostructured GDC powder (D = 8 nm) of irregular particle shape or with spherical particles of 200 nm diameter. Symmetrical cells (cathode/electrolyte/cathode) with different weight ratios of LSC:GDC (100: 0, 75 : 25, 50: 50 and 25 : 75 wt%) thick cathodes were fabricated by the screen-printing method and tested by EIS in the temperature range of 500-700 °C under a synthetic air flow of 100 mL min-1. These nanostructured composite materials exhibited excellent performance (area-specific resistance - ASR - values in the range of 0.019-0.032 Ω cm2 for an operating temperature of 700 °C). The best performance was achieved at a weight ratio of 75 : 25 wt% (LSC:GDC) when nanostructured GDC spheres were employed. This enhanced performance can be attributed to GDC morphology along with GDC anionic conduction, which prevent the blocking of LSC electrochemical reaction sites on surface, keeping them active by depleting its surface of adsorbed and reduced oxygen. The limiting processes were determined to take place on the LSC surface. New insight on cobalt's speciation under working-like conditions, determined by in situ X-ray Absorption Spectroscopy (XAS) experiments, suggests that the ease of cobalt atoms for changing their oxidation state is the key feature that rules the electrochemical activity of LSC and an atomistic model that explains it is proposed.Fil: Acuña, Leandro Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Investigación y Desarrollo Estratégico para la Defensa. Ministerio de Defensa. Unidad de Investigación y Desarrollo Estratégico para la Defensa; ArgentinaFil: Cabezas, Marcelo Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Investigación y Desarrollo Estratégico para la Defensa. Ministerio de Defensa. Unidad de Investigación y Desarrollo Estratégico para la Defensa; ArgentinaFil: Fuentes, Rodolfo Oscar. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Constituyentes | Comision Nacional de Energia Atomica. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Constituyentes.; ArgentinaRoyal Society of Chemistry2022-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/216877Acuña, Leandro Marcelo; Cabezas, Marcelo Daniel; Fuentes, Rodolfo Oscar; Improvement on the electrochemical performance by morphology control of nanostructured La0.6Sr0.4CoO3-δ-Gd0.1Ce0.9O1.95cathodes for IT-SOFC; Royal Society of Chemistry; Energy Advances; 6; 6-2022; 344-3562753-1457CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://pubs.rsc.org/en/content/articlelanding/2022/YA/D2YA00085Ginfo:eu-repo/semantics/altIdentifier/doi/10.1039/d2ya00085ginfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-10T13:19:20Zoai:ri.conicet.gov.ar:11336/216877instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-10 13:19:21.238CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Improvement on the electrochemical performance by morphology control of nanostructured La0.6Sr0.4CoO3-δ-Gd0.1Ce0.9O1.95cathodes for IT-SOFC
title Improvement on the electrochemical performance by morphology control of nanostructured La0.6Sr0.4CoO3-δ-Gd0.1Ce0.9O1.95cathodes for IT-SOFC
spellingShingle Improvement on the electrochemical performance by morphology control of nanostructured La0.6Sr0.4CoO3-δ-Gd0.1Ce0.9O1.95cathodes for IT-SOFC
Acuña, Leandro Marcelo
Cathodes
SOFC
EIS
XAS
title_short Improvement on the electrochemical performance by morphology control of nanostructured La0.6Sr0.4CoO3-δ-Gd0.1Ce0.9O1.95cathodes for IT-SOFC
title_full Improvement on the electrochemical performance by morphology control of nanostructured La0.6Sr0.4CoO3-δ-Gd0.1Ce0.9O1.95cathodes for IT-SOFC
title_fullStr Improvement on the electrochemical performance by morphology control of nanostructured La0.6Sr0.4CoO3-δ-Gd0.1Ce0.9O1.95cathodes for IT-SOFC
title_full_unstemmed Improvement on the electrochemical performance by morphology control of nanostructured La0.6Sr0.4CoO3-δ-Gd0.1Ce0.9O1.95cathodes for IT-SOFC
title_sort Improvement on the electrochemical performance by morphology control of nanostructured La0.6Sr0.4CoO3-δ-Gd0.1Ce0.9O1.95cathodes for IT-SOFC
dc.creator.none.fl_str_mv Acuña, Leandro Marcelo
Cabezas, Marcelo Daniel
Fuentes, Rodolfo Oscar
author Acuña, Leandro Marcelo
author_facet Acuña, Leandro Marcelo
Cabezas, Marcelo Daniel
Fuentes, Rodolfo Oscar
author_role author
author2 Cabezas, Marcelo Daniel
Fuentes, Rodolfo Oscar
author2_role author
author
dc.subject.none.fl_str_mv Cathodes
SOFC
EIS
XAS
topic Cathodes
SOFC
EIS
XAS
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The effect of the particle's shape of Gd0.1Ce0.9O2-d (GDC) nanopowders on the electrochemical performance of La0.6Sr0.4CoO3-δ (LSC)-GDC composite cathodes was experimentally studied by electrochemical impedance spectroscopy (EIS). Composites were made of nanostructured LSC perovskite (average crystallite size D = 30 nm) mixed with nanostructured GDC powder (D = 8 nm) of irregular particle shape or with spherical particles of 200 nm diameter. Symmetrical cells (cathode/electrolyte/cathode) with different weight ratios of LSC:GDC (100: 0, 75 : 25, 50: 50 and 25 : 75 wt%) thick cathodes were fabricated by the screen-printing method and tested by EIS in the temperature range of 500-700 °C under a synthetic air flow of 100 mL min-1. These nanostructured composite materials exhibited excellent performance (area-specific resistance - ASR - values in the range of 0.019-0.032 Ω cm2 for an operating temperature of 700 °C). The best performance was achieved at a weight ratio of 75 : 25 wt% (LSC:GDC) when nanostructured GDC spheres were employed. This enhanced performance can be attributed to GDC morphology along with GDC anionic conduction, which prevent the blocking of LSC electrochemical reaction sites on surface, keeping them active by depleting its surface of adsorbed and reduced oxygen. The limiting processes were determined to take place on the LSC surface. New insight on cobalt's speciation under working-like conditions, determined by in situ X-ray Absorption Spectroscopy (XAS) experiments, suggests that the ease of cobalt atoms for changing their oxidation state is the key feature that rules the electrochemical activity of LSC and an atomistic model that explains it is proposed.
Fil: Acuña, Leandro Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Investigación y Desarrollo Estratégico para la Defensa. Ministerio de Defensa. Unidad de Investigación y Desarrollo Estratégico para la Defensa; Argentina
Fil: Cabezas, Marcelo Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Investigación y Desarrollo Estratégico para la Defensa. Ministerio de Defensa. Unidad de Investigación y Desarrollo Estratégico para la Defensa; Argentina
Fil: Fuentes, Rodolfo Oscar. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Constituyentes | Comision Nacional de Energia Atomica. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Constituyentes.; Argentina
description The effect of the particle's shape of Gd0.1Ce0.9O2-d (GDC) nanopowders on the electrochemical performance of La0.6Sr0.4CoO3-δ (LSC)-GDC composite cathodes was experimentally studied by electrochemical impedance spectroscopy (EIS). Composites were made of nanostructured LSC perovskite (average crystallite size D = 30 nm) mixed with nanostructured GDC powder (D = 8 nm) of irregular particle shape or with spherical particles of 200 nm diameter. Symmetrical cells (cathode/electrolyte/cathode) with different weight ratios of LSC:GDC (100: 0, 75 : 25, 50: 50 and 25 : 75 wt%) thick cathodes were fabricated by the screen-printing method and tested by EIS in the temperature range of 500-700 °C under a synthetic air flow of 100 mL min-1. These nanostructured composite materials exhibited excellent performance (area-specific resistance - ASR - values in the range of 0.019-0.032 Ω cm2 for an operating temperature of 700 °C). The best performance was achieved at a weight ratio of 75 : 25 wt% (LSC:GDC) when nanostructured GDC spheres were employed. This enhanced performance can be attributed to GDC morphology along with GDC anionic conduction, which prevent the blocking of LSC electrochemical reaction sites on surface, keeping them active by depleting its surface of adsorbed and reduced oxygen. The limiting processes were determined to take place on the LSC surface. New insight on cobalt's speciation under working-like conditions, determined by in situ X-ray Absorption Spectroscopy (XAS) experiments, suggests that the ease of cobalt atoms for changing their oxidation state is the key feature that rules the electrochemical activity of LSC and an atomistic model that explains it is proposed.
publishDate 2022
dc.date.none.fl_str_mv 2022-06
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/216877
Acuña, Leandro Marcelo; Cabezas, Marcelo Daniel; Fuentes, Rodolfo Oscar; Improvement on the electrochemical performance by morphology control of nanostructured La0.6Sr0.4CoO3-δ-Gd0.1Ce0.9O1.95cathodes for IT-SOFC; Royal Society of Chemistry; Energy Advances; 6; 6-2022; 344-356
2753-1457
CONICET Digital
CONICET
url http://hdl.handle.net/11336/216877
identifier_str_mv Acuña, Leandro Marcelo; Cabezas, Marcelo Daniel; Fuentes, Rodolfo Oscar; Improvement on the electrochemical performance by morphology control of nanostructured La0.6Sr0.4CoO3-δ-Gd0.1Ce0.9O1.95cathodes for IT-SOFC; Royal Society of Chemistry; Energy Advances; 6; 6-2022; 344-356
2753-1457
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://pubs.rsc.org/en/content/articlelanding/2022/YA/D2YA00085G
info:eu-repo/semantics/altIdentifier/doi/10.1039/d2ya00085g
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Royal Society of Chemistry
publisher.none.fl_str_mv Royal Society of Chemistry
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 12.48226

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