An insight into the electrochemical performance of La0.5-XPrxBa0.5CoO3- δ as cathodes for solid oxide fuel cells: Study of the O2-reduction reaction

Autores
Garcés, D.; Wang, H.; Barnett, S.A.; Leyva, Adelma Graciela; Napolitano, Federico Ricardo; Fuentes, Rodolfo Oscar; Troiani, Horacio Esteban; Mogni, Liliana Verónica
Año de publicación
2018
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
New LT-SOFC cathodes with La0.5-xPrxBa0.5CoO3-δ (0 ≤ x ≤ 0.5) compositions were studied. The La-rich compounds exhibit an inter-growing cubic and tetragonal structure whereas the Pr-rich show a tetragonal structure. Cathode polarization resistances, estimated from electrochemical impedance (EIS), take values around 0.15 and 0.04 Ω cm2 in air at 600 and 700 °C, respectively. The O2-reduction mechanism and its kinetic coefficients, O-ion diffusion (Dchem) and O-surface exchange (kchem), were studied by applying the ALS model for macro homogenous porous electrodes to the EIS data, in combination with microstructural parameters obtained from three-dimensional tomography using focused ion beam-scanning electron microscopy (3D FIB-SEM). The diffusion coefficients for samples with mixing of phases take values of Dchem ∼ 10-6 cm2 s-1, at 700 °C in air, whereas the pure tetragonal phases present lower values Dchem ∼ 10-8 cm2 s-1. On the contrary the kchem for all samples takes values ranging between 0.4 and 1 × 10-4 cm s-1 at 700 °C in air. In addition, the origin of time evolution of polarization at 700 °C in air was evaluated by combining the EIS spectra as a function of time and the ex situ sample characterization of fresh and tested samples by 3D FIB-SEM tomography and inductively coupled plasma-optical emission spectrometry (ICP-OES). Little changes of microstructures were detected, whereas an increasing of the amount of a water-soluble Ba surface species in comparison with total cation surface segregation was observed for all samples after the ageing. This may constitute the main reason causing the polarization resistance degradation. However, the analysis of time evolution shows, that contrary to the situations reported for SrO segregation in Sr-based perovskites, the Dchem is the coefficient mainly affected for compositions with inter-grown phases. At the same time, both Dchem and kchem decreases with time when only the tetragonal phase is present.
Fil: Garcés, D.. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina
Fil: Wang, H.. Northwestern University; Estados Unidos
Fil: Barnett, S.A.. Northwestern University; Estados Unidos
Fil: Leyva, Adelma Graciela. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Universidad Nacional de San Martín. Escuela de Ciencia y Tecnología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Napolitano, Federico Ricardo. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina
Fil: Fuentes, Rodolfo Oscar. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Troiani, Horacio Esteban. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina
Fil: Mogni, Liliana Verónica. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina
Materia
IT-SOFC
cathode
degradation
FIB-SEM
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/112434
Acceder
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network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling An insight into the electrochemical performance of La0.5-XPrxBa0.5CoO3- δ as cathodes for solid oxide fuel cells: Study of the O2-reduction reactionGarcés, D.Wang, H.Barnett, S.A.Leyva, Adelma GracielaNapolitano, Federico RicardoFuentes, Rodolfo OscarTroiani, Horacio EstebanMogni, Liliana VerónicaIT-SOFCcathodedegradationFIB-SEMhttps://purl.org/becyt/ford/2.5https://purl.org/becyt/ford/2New LT-SOFC cathodes with La0.5-xPrxBa0.5CoO3-δ (0 ≤ x ≤ 0.5) compositions were studied. The La-rich compounds exhibit an inter-growing cubic and tetragonal structure whereas the Pr-rich show a tetragonal structure. Cathode polarization resistances, estimated from electrochemical impedance (EIS), take values around 0.15 and 0.04 Ω cm2 in air at 600 and 700 °C, respectively. The O2-reduction mechanism and its kinetic coefficients, O-ion diffusion (Dchem) and O-surface exchange (kchem), were studied by applying the ALS model for macro homogenous porous electrodes to the EIS data, in combination with microstructural parameters obtained from three-dimensional tomography using focused ion beam-scanning electron microscopy (3D FIB-SEM). The diffusion coefficients for samples with mixing of phases take values of Dchem ∼ 10-6 cm2 s-1, at 700 °C in air, whereas the pure tetragonal phases present lower values Dchem ∼ 10-8 cm2 s-1. On the contrary the kchem for all samples takes values ranging between 0.4 and 1 × 10-4 cm s-1 at 700 °C in air. In addition, the origin of time evolution of polarization at 700 °C in air was evaluated by combining the EIS spectra as a function of time and the ex situ sample characterization of fresh and tested samples by 3D FIB-SEM tomography and inductively coupled plasma-optical emission spectrometry (ICP-OES). Little changes of microstructures were detected, whereas an increasing of the amount of a water-soluble Ba surface species in comparison with total cation surface segregation was observed for all samples after the ageing. This may constitute the main reason causing the polarization resistance degradation. However, the analysis of time evolution shows, that contrary to the situations reported for SrO segregation in Sr-based perovskites, the Dchem is the coefficient mainly affected for compositions with inter-grown phases. At the same time, both Dchem and kchem decreases with time when only the tetragonal phase is present.Fil: Garcés, D.. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; ArgentinaFil: Wang, H.. Northwestern University; Estados UnidosFil: Barnett, S.A.. Northwestern University; Estados UnidosFil: Leyva, Adelma Graciela. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Universidad Nacional de San Martín. Escuela de Ciencia y Tecnología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Napolitano, Federico Ricardo. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; ArgentinaFil: Fuentes, Rodolfo Oscar. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Troiani, Horacio Esteban. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; ArgentinaFil: Mogni, Liliana Verónica. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; ArgentinaRoyal Society of Chemistry2018-08info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/112434Garcés, D.; Wang, H.; Barnett, S.A.; Leyva, Adelma Graciela; Napolitano, Federico Ricardo; et al.; An insight into the electrochemical performance of La0.5-XPrxBa0.5CoO3- δ as cathodes for solid oxide fuel cells: Study of the O2-reduction reaction; Royal Society of Chemistry; Journal of Materials Chemistry A; 6; 34; 8-2018; 16699-167092050-74882050-7496CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://xlink.rsc.org/?DOI=C8TA04338Hinfo:eu-repo/semantics/altIdentifier/doi/10.1039/c8ta04338hinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:01:39Zoai:ri.conicet.gov.ar:11336/112434instacron: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:34982025-09-03 10:01:39.721CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv An insight into the electrochemical performance of La0.5-XPrxBa0.5CoO3- δ as cathodes for solid oxide fuel cells: Study of the O2-reduction reaction
title An insight into the electrochemical performance of La0.5-XPrxBa0.5CoO3- δ as cathodes for solid oxide fuel cells: Study of the O2-reduction reaction
spellingShingle An insight into the electrochemical performance of La0.5-XPrxBa0.5CoO3- δ as cathodes for solid oxide fuel cells: Study of the O2-reduction reaction
Garcés, D.
IT-SOFC
cathode
degradation
FIB-SEM
title_short An insight into the electrochemical performance of La0.5-XPrxBa0.5CoO3- δ as cathodes for solid oxide fuel cells: Study of the O2-reduction reaction
title_full An insight into the electrochemical performance of La0.5-XPrxBa0.5CoO3- δ as cathodes for solid oxide fuel cells: Study of the O2-reduction reaction
title_fullStr An insight into the electrochemical performance of La0.5-XPrxBa0.5CoO3- δ as cathodes for solid oxide fuel cells: Study of the O2-reduction reaction
title_full_unstemmed An insight into the electrochemical performance of La0.5-XPrxBa0.5CoO3- δ as cathodes for solid oxide fuel cells: Study of the O2-reduction reaction
title_sort An insight into the electrochemical performance of La0.5-XPrxBa0.5CoO3- δ as cathodes for solid oxide fuel cells: Study of the O2-reduction reaction
dc.creator.none.fl_str_mv Garcés, D.
Wang, H.
Barnett, S.A.
Leyva, Adelma Graciela
Napolitano, Federico Ricardo
Fuentes, Rodolfo Oscar
Troiani, Horacio Esteban
Mogni, Liliana Verónica
author Garcés, D.
author_facet Garcés, D.
Wang, H.
Barnett, S.A.
Leyva, Adelma Graciela
Napolitano, Federico Ricardo
Fuentes, Rodolfo Oscar
Troiani, Horacio Esteban
Mogni, Liliana Verónica
author_role author
author2 Wang, H.
Barnett, S.A.
Leyva, Adelma Graciela
Napolitano, Federico Ricardo
Fuentes, Rodolfo Oscar
Troiani, Horacio Esteban
Mogni, Liliana Verónica
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv IT-SOFC
cathode
degradation
FIB-SEM
topic IT-SOFC
cathode
degradation
FIB-SEM
purl_subject.fl_str_mv https://purl.org/becyt/ford/2.5
https://purl.org/becyt/ford/2
dc.description.none.fl_txt_mv New LT-SOFC cathodes with La0.5-xPrxBa0.5CoO3-δ (0 ≤ x ≤ 0.5) compositions were studied. The La-rich compounds exhibit an inter-growing cubic and tetragonal structure whereas the Pr-rich show a tetragonal structure. Cathode polarization resistances, estimated from electrochemical impedance (EIS), take values around 0.15 and 0.04 Ω cm2 in air at 600 and 700 °C, respectively. The O2-reduction mechanism and its kinetic coefficients, O-ion diffusion (Dchem) and O-surface exchange (kchem), were studied by applying the ALS model for macro homogenous porous electrodes to the EIS data, in combination with microstructural parameters obtained from three-dimensional tomography using focused ion beam-scanning electron microscopy (3D FIB-SEM). The diffusion coefficients for samples with mixing of phases take values of Dchem ∼ 10-6 cm2 s-1, at 700 °C in air, whereas the pure tetragonal phases present lower values Dchem ∼ 10-8 cm2 s-1. On the contrary the kchem for all samples takes values ranging between 0.4 and 1 × 10-4 cm s-1 at 700 °C in air. In addition, the origin of time evolution of polarization at 700 °C in air was evaluated by combining the EIS spectra as a function of time and the ex situ sample characterization of fresh and tested samples by 3D FIB-SEM tomography and inductively coupled plasma-optical emission spectrometry (ICP-OES). Little changes of microstructures were detected, whereas an increasing of the amount of a water-soluble Ba surface species in comparison with total cation surface segregation was observed for all samples after the ageing. This may constitute the main reason causing the polarization resistance degradation. However, the analysis of time evolution shows, that contrary to the situations reported for SrO segregation in Sr-based perovskites, the Dchem is the coefficient mainly affected for compositions with inter-grown phases. At the same time, both Dchem and kchem decreases with time when only the tetragonal phase is present.
Fil: Garcés, D.. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina
Fil: Wang, H.. Northwestern University; Estados Unidos
Fil: Barnett, S.A.. Northwestern University; Estados Unidos
Fil: Leyva, Adelma Graciela. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Universidad Nacional de San Martín. Escuela de Ciencia y Tecnología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Napolitano, Federico Ricardo. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina
Fil: Fuentes, Rodolfo Oscar. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Troiani, Horacio Esteban. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina
Fil: Mogni, Liliana Verónica. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina
description New LT-SOFC cathodes with La0.5-xPrxBa0.5CoO3-δ (0 ≤ x ≤ 0.5) compositions were studied. The La-rich compounds exhibit an inter-growing cubic and tetragonal structure whereas the Pr-rich show a tetragonal structure. Cathode polarization resistances, estimated from electrochemical impedance (EIS), take values around 0.15 and 0.04 Ω cm2 in air at 600 and 700 °C, respectively. The O2-reduction mechanism and its kinetic coefficients, O-ion diffusion (Dchem) and O-surface exchange (kchem), were studied by applying the ALS model for macro homogenous porous electrodes to the EIS data, in combination with microstructural parameters obtained from three-dimensional tomography using focused ion beam-scanning electron microscopy (3D FIB-SEM). The diffusion coefficients for samples with mixing of phases take values of Dchem ∼ 10-6 cm2 s-1, at 700 °C in air, whereas the pure tetragonal phases present lower values Dchem ∼ 10-8 cm2 s-1. On the contrary the kchem for all samples takes values ranging between 0.4 and 1 × 10-4 cm s-1 at 700 °C in air. In addition, the origin of time evolution of polarization at 700 °C in air was evaluated by combining the EIS spectra as a function of time and the ex situ sample characterization of fresh and tested samples by 3D FIB-SEM tomography and inductively coupled plasma-optical emission spectrometry (ICP-OES). Little changes of microstructures were detected, whereas an increasing of the amount of a water-soluble Ba surface species in comparison with total cation surface segregation was observed for all samples after the ageing. This may constitute the main reason causing the polarization resistance degradation. However, the analysis of time evolution shows, that contrary to the situations reported for SrO segregation in Sr-based perovskites, the Dchem is the coefficient mainly affected for compositions with inter-grown phases. At the same time, both Dchem and kchem decreases with time when only the tetragonal phase is present.
publishDate 2018
dc.date.none.fl_str_mv 2018-08
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/11336/112434
Garcés, D.; Wang, H.; Barnett, S.A.; Leyva, Adelma Graciela; Napolitano, Federico Ricardo; et al.; An insight into the electrochemical performance of La0.5-XPrxBa0.5CoO3- δ as cathodes for solid oxide fuel cells: Study of the O2-reduction reaction; Royal Society of Chemistry; Journal of Materials Chemistry A; 6; 34; 8-2018; 16699-16709
2050-7488
2050-7496
CONICET Digital
CONICET
url http://hdl.handle.net/11336/112434
identifier_str_mv Garcés, D.; Wang, H.; Barnett, S.A.; Leyva, Adelma Graciela; Napolitano, Federico Ricardo; et al.; An insight into the electrochemical performance of La0.5-XPrxBa0.5CoO3- δ as cathodes for solid oxide fuel cells: Study of the O2-reduction reaction; Royal Society of Chemistry; Journal of Materials Chemistry A; 6; 34; 8-2018; 16699-16709
2050-7488
2050-7496
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://xlink.rsc.org/?DOI=C8TA04338H
info:eu-repo/semantics/altIdentifier/doi/10.1039/c8ta04338h
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
application/pdf
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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 13.13397

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