Cerium–terbium mixed oxides as potential materials for anodes in solid oxide fuel cells

Highly homogeneous (Ce,Tb) oxides are prepared by a microemulsion technique, and their structural and electronic state after high temperature calcination is examined with X-ray diffraction, high resolution transmission electron microscopy, X-ray photoelectron and absorption (XANES) spectroscopies an...

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Autores: Martínez Arias, Arturo, Hungría, Ana B., Iglesias Juez, Ana, Conesa Cegarra, José Carlos, Mather, Glenn C., Munuera, Guillermo, Fernández, M.
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2005
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/173090
Acceso en línea:http://hdl.handle.net/10261/173090
Access Level:acceso abierto
Palabra clave:Cerium oxide
Terbium oxide
Solid oxide fuel cell
Anode
Structure
Surface area
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spelling Cerium–terbium mixed oxides as potential materials for anodes in solid oxide fuel cellsMartínez Arias, ArturoHungría, Ana B.Iglesias Juez, AnaConesa Cegarra, José CarlosMather, Glenn C.Munuera, GuillermoFernández, M.Cerium oxideTerbium oxideSolid oxide fuel cellAnodeStructureSurface areaHighly homogeneous (Ce,Tb) oxides are prepared by a microemulsion technique, and their structural and electronic state after high temperature calcination is examined with X-ray diffraction, high resolution transmission electron microscopy, X-ray photoelectron and absorption (XANES) spectroscopies and impedance spectroscopy measurements. Addition of Tb stabilizes significantly (in comparison to pure ceria) specific surface area and small particles sizes during high temperature calcination (up to 1100 °C); phase decomposition at these high temperatures, similar to that occurring when stabilization of ceria is carried out with Zr, does not occur, and the mixed oxide remains homogeneous throughout. Tb addition to ceria may thus be beneficial when used as a component of SOFC anodes. TEM data indicate reshaping of oxide particles and provide evidence of crystal superstructures after high temperature treatments, while XPS and XANES reveal an increase in the Tb4+/Tb3+ ratio (for a given pretreatment) with the Tb/Ce ratio; Ce seems to be less reducible to Ce3+ in the presence of Tb. Total electrical conductivity of CT samples under H2 is mediated by electron transport (involving probably only Ce) and is lower than in gadolinia-doped ceria (GCO); in air conductivity is higher than for GCO, particularly at low temperatures, and it is probable that a p-type transport mechanism predominates in this case.Thanks are given to CICYT (Project MAT2003-03925) for financial support of this research, to the Universities of Madrid (Complutense) and Cádiz for the facilities given for the obtention of TEM data, to ICP-Unidad de Apoyo staff for chemical analysis results and XRD recording, to technical staff at Daresbury Laboratory Station 9.3 (Drs. I. Harvey and A.R. Lennie) for the help given during recording of the XAFS spectra, and to Mr. A. Macías for assistance in recording the XPS data.Peer reviewedElsevierComisión Interministerial de Ciencia y Tecnología, CICYT (España)Universidad Complutense de MadridUniversidad de CádizConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]201820182005info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/173090reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.1016/j.jpowsour.2005.02.079Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1730902026-05-22T06:33:51Z
dc.title.none.fl_str_mv Cerium–terbium mixed oxides as potential materials for anodes in solid oxide fuel cells
title Cerium–terbium mixed oxides as potential materials for anodes in solid oxide fuel cells
spellingShingle Cerium–terbium mixed oxides as potential materials for anodes in solid oxide fuel cells
Martínez Arias, Arturo
Cerium oxide
Terbium oxide
Solid oxide fuel cell
Anode
Structure
Surface area
title_short Cerium–terbium mixed oxides as potential materials for anodes in solid oxide fuel cells
title_full Cerium–terbium mixed oxides as potential materials for anodes in solid oxide fuel cells
title_fullStr Cerium–terbium mixed oxides as potential materials for anodes in solid oxide fuel cells
title_full_unstemmed Cerium–terbium mixed oxides as potential materials for anodes in solid oxide fuel cells
title_sort Cerium–terbium mixed oxides as potential materials for anodes in solid oxide fuel cells
dc.creator.none.fl_str_mv Martínez Arias, Arturo
Hungría, Ana B.
Iglesias Juez, Ana
Conesa Cegarra, José Carlos
Mather, Glenn C.
Munuera, Guillermo
Fernández, M.
author Martínez Arias, Arturo
author_facet Martínez Arias, Arturo
Hungría, Ana B.
Iglesias Juez, Ana
Conesa Cegarra, José Carlos
Mather, Glenn C.
Munuera, Guillermo
Fernández, M.
author_role author
author2 Hungría, Ana B.
Iglesias Juez, Ana
Conesa Cegarra, José Carlos
Mather, Glenn C.
Munuera, Guillermo
Fernández, M.
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv Comisión Interministerial de Ciencia y Tecnología, CICYT (España)
Universidad Complutense de Madrid
Universidad de Cádiz
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Cerium oxide
Terbium oxide
Solid oxide fuel cell
Anode
Structure
Surface area
topic Cerium oxide
Terbium oxide
Solid oxide fuel cell
Anode
Structure
Surface area
description Highly homogeneous (Ce,Tb) oxides are prepared by a microemulsion technique, and their structural and electronic state after high temperature calcination is examined with X-ray diffraction, high resolution transmission electron microscopy, X-ray photoelectron and absorption (XANES) spectroscopies and impedance spectroscopy measurements. Addition of Tb stabilizes significantly (in comparison to pure ceria) specific surface area and small particles sizes during high temperature calcination (up to 1100 °C); phase decomposition at these high temperatures, similar to that occurring when stabilization of ceria is carried out with Zr, does not occur, and the mixed oxide remains homogeneous throughout. Tb addition to ceria may thus be beneficial when used as a component of SOFC anodes. TEM data indicate reshaping of oxide particles and provide evidence of crystal superstructures after high temperature treatments, while XPS and XANES reveal an increase in the Tb4+/Tb3+ ratio (for a given pretreatment) with the Tb/Ce ratio; Ce seems to be less reducible to Ce3+ in the presence of Tb. Total electrical conductivity of CT samples under H2 is mediated by electron transport (involving probably only Ce) and is lower than in gadolinia-doped ceria (GCO); in air conductivity is higher than for GCO, particularly at low temperatures, and it is probable that a p-type transport mechanism predominates in this case.
publishDate 2005
dc.date.none.fl_str_mv 2005
2018
2018
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/173090
url http://hdl.handle.net/10261/173090
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.1016/j.jpowsour.2005.02.079
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,81155

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