Caracterización estructural y estudio de las propiedades electroquímicas de óxidos derivados del GdBaCo₂O₅₊δ: nuevos materiales para cátodos de pilas de combustible tipo SOFC

The aim of this work is the synthesis, structural characterisation and study of the physical properties of oxides based on GdBaCo2O5+δ for being used as cathodes in solid oxide fuel cells (SOFCs). We have studied the effect of the substitution of different transition-metal atoms by Co in the GdBaCo2...

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Detalhes bibliográficos
Autor: Muñoz Gil, Daniel
Formato: tesis doctoral
Fecha de publicación:2016
País:España
Recursos:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:español
OAI Identifier:oai:docta.ucm.es:20.500.14352/26929
Acesso em linha:https://hdl.handle.net/20.500.14352/26929
Access Level:acceso abierto
Palavra-chave:546(043.2)
Química inorgánica
Chemistry
Inorganic
Química inorgánica (Química)
2303 Química Inorgánica
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oai_identifier_str oai:docta.ucm.es:20.500.14352/26929
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network_name_str España
repository_id_str
spelling Caracterización estructural y estudio de las propiedades electroquímicas de óxidos derivados del GdBaCo₂O₅₊δ: nuevos materiales para cátodos de pilas de combustible tipo SOFCMuñoz Gil, Daniel546(043.2)Química inorgánicaChemistryInorganicQuímica inorgánica (Química)2303 Química InorgánicaThe aim of this work is the synthesis, structural characterisation and study of the physical properties of oxides based on GdBaCo2O5+δ for being used as cathodes in solid oxide fuel cells (SOFCs). We have studied the effect of the substitution of different transition-metal atoms by Co in the GdBaCo2O5+δ compound. In particular, the work has focused in the study of the GdBaCo2-xFexO5+δ, GdBaCo2-xMnxO5+δ, GdBaMn2- xFexO5+δ and Gd0.5Ca0.5BaCo2-xFexO5+δ systems. The oxides have been prepared by ceramic method under different gas atmospheres. The structural characterisation has been carried out by a combination of techniques: xray diffraction (XRD), selected area electron diffraction (SAED), high-resolution transmission electron microscopy (HRTEM) and in some cases by scanning transmission electron microscopy (STEM). Oxides have also been characterized (metallic composition, average oxidation state of the transition metals and oxygen content) by XEDS, EELS and redox titration. Thermal stability has been evaluated by thermogravimetric analysis in air from room temperature to 900 ºC. Thermal expansion coefficients (TEC) have been determinate from the variation of the lattice parameters of the unit cell with the temperature, obtained by fitting the profile of the XRD patterns at different temperatures. Electrical properties have been studied by DC measurements under different gas atmospheres (air, O2 and N2). Electrochemical behaviour has been investigated by AC impedance spectroscopy on symmetrical cells using CGO as electrolyte...Universidad Complutense de MadridGarcía Martín, SusanaUniversidad Complutense de Madrid20162016-04-0620162016-04-06doctoral thesishttp://purl.org/coar/resource_type/c_db06info:eu-repo/semantics/doctoralThesisapplication/pdfhttps://hdl.handle.net/20.500.14352/26929reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Españolspaopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/269292026-06-02T12:44:21Z
dc.title.none.fl_str_mv Caracterización estructural y estudio de las propiedades electroquímicas de óxidos derivados del GdBaCo₂O₅₊δ: nuevos materiales para cátodos de pilas de combustible tipo SOFC
title Caracterización estructural y estudio de las propiedades electroquímicas de óxidos derivados del GdBaCo₂O₅₊δ: nuevos materiales para cátodos de pilas de combustible tipo SOFC
spellingShingle Caracterización estructural y estudio de las propiedades electroquímicas de óxidos derivados del GdBaCo₂O₅₊δ: nuevos materiales para cátodos de pilas de combustible tipo SOFC
Muñoz Gil, Daniel
546(043.2)
Química inorgánica
Chemistry
Inorganic
Química inorgánica (Química)
2303 Química Inorgánica
title_short Caracterización estructural y estudio de las propiedades electroquímicas de óxidos derivados del GdBaCo₂O₅₊δ: nuevos materiales para cátodos de pilas de combustible tipo SOFC
title_full Caracterización estructural y estudio de las propiedades electroquímicas de óxidos derivados del GdBaCo₂O₅₊δ: nuevos materiales para cátodos de pilas de combustible tipo SOFC
title_fullStr Caracterización estructural y estudio de las propiedades electroquímicas de óxidos derivados del GdBaCo₂O₅₊δ: nuevos materiales para cátodos de pilas de combustible tipo SOFC
title_full_unstemmed Caracterización estructural y estudio de las propiedades electroquímicas de óxidos derivados del GdBaCo₂O₅₊δ: nuevos materiales para cátodos de pilas de combustible tipo SOFC
title_sort Caracterización estructural y estudio de las propiedades electroquímicas de óxidos derivados del GdBaCo₂O₅₊δ: nuevos materiales para cátodos de pilas de combustible tipo SOFC
dc.creator.none.fl_str_mv Muñoz Gil, Daniel
author Muñoz Gil, Daniel
author_facet Muñoz Gil, Daniel
author_role author
dc.contributor.none.fl_str_mv García Martín, Susana
Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 546(043.2)
Química inorgánica
Chemistry
Inorganic
Química inorgánica (Química)
2303 Química Inorgánica
topic 546(043.2)
Química inorgánica
Chemistry
Inorganic
Química inorgánica (Química)
2303 Química Inorgánica
description The aim of this work is the synthesis, structural characterisation and study of the physical properties of oxides based on GdBaCo2O5+δ for being used as cathodes in solid oxide fuel cells (SOFCs). We have studied the effect of the substitution of different transition-metal atoms by Co in the GdBaCo2O5+δ compound. In particular, the work has focused in the study of the GdBaCo2-xFexO5+δ, GdBaCo2-xMnxO5+δ, GdBaMn2- xFexO5+δ and Gd0.5Ca0.5BaCo2-xFexO5+δ systems. The oxides have been prepared by ceramic method under different gas atmospheres. The structural characterisation has been carried out by a combination of techniques: xray diffraction (XRD), selected area electron diffraction (SAED), high-resolution transmission electron microscopy (HRTEM) and in some cases by scanning transmission electron microscopy (STEM). Oxides have also been characterized (metallic composition, average oxidation state of the transition metals and oxygen content) by XEDS, EELS and redox titration. Thermal stability has been evaluated by thermogravimetric analysis in air from room temperature to 900 ºC. Thermal expansion coefficients (TEC) have been determinate from the variation of the lattice parameters of the unit cell with the temperature, obtained by fitting the profile of the XRD patterns at different temperatures. Electrical properties have been studied by DC measurements under different gas atmospheres (air, O2 and N2). Electrochemical behaviour has been investigated by AC impedance spectroscopy on symmetrical cells using CGO as electrolyte...
publishDate 2016
dc.date.none.fl_str_mv 2016
2016-04-06
2016
2016-04-06
dc.type.none.fl_str_mv doctoral thesis
http://purl.org/coar/resource_type/c_db06
dc.type.openaire.fl_str_mv info:eu-repo/semantics/doctoralThesis
format doctoralThesis
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/26929
url https://hdl.handle.net/20.500.14352/26929
dc.language.none.fl_str_mv Español
spa
language_invalid_str_mv Español
language spa
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidad Complutense de Madrid
publisher.none.fl_str_mv Universidad Complutense de Madrid
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300719

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