Temperature dependence of partial conductivities of the BaZr0.7Ce0.2Y0.1O3-δ proton conductor

[EN] Partial conductivities are presented for BaZrCeYO, an important proton conductor for protonic-ceramic fuel cells and membrane reactors. Atmospheric dependencies of impedance performed in humidified and dry O, air, N and H(10%)/N(90%) in the temperature range 300–900 °C, supported by the modifie...

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Detalles Bibliográficos
Autores: Heras-Juaristi, Gemma, Pérez-Coll, Domingo, Mather, Glenn C.
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2017
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/200985
Acceso en línea:http://hdl.handle.net/10261/200985
Access Level:acceso abierto
Palabra clave:BZCY72
Transport numbers
Proton conductivity
Defect chemistry
EMF method
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spelling Temperature dependence of partial conductivities of the BaZr0.7Ce0.2Y0.1O3-δ proton conductorHeras-Juaristi, GemmaPérez-Coll, DomingoMather, Glenn C.BZCY72Transport numbersProton conductivityDefect chemistryEMF method[EN] Partial conductivities are presented for BaZrCeYO, an important proton conductor for protonic-ceramic fuel cells and membrane reactors. Atmospheric dependencies of impedance performed in humidified and dry O, air, N and H(10%)/N(90%) in the temperature range 300–900 °C, supported by the modified emf method, confirm significant electron-hole and protonic contributions to transport. For very reducing and wet atmospheres, the conductivity is predominantly ionic, with a higher participation of protons with decreasing temperature and increasing water-vapour partial pressure (pHO). From moderately reducing conditions of wet N to wet O, however, the conductivity is considerably influenced by electron holes as revealed by a significant dependence of total conductivity on oxygen partial pressure (pO). With higher pHO, proton transport increases, with a concomitant decrease of holes and oxygen vacancies. However, the effect of pHO is also influenced by temperature, with a greater protonic contribution at both lower temperature and pO. Values of proton transport number t ≈ 0.63 and electronic transport number t ≈ 0.37 are obtained at 600 °C for pHO = 0.022 atm and pO = 0.2 atm, whereas t ≈ 0.95 and t ≈ 0.05 for pO = 10 atm. A hydration enthalpy of −109 kJ mol is obtained in the range 600–900 °C.We thank the “Ministerio de Economía, Industria y Competitividad” (MINECO) in Spain for financial assistance (ENE2015-66183-R).Elsevier BVMinisterio de Economía y Competitividad (España)Pérez-Coll, Domingo [0000-0001-5331-2516]Mather, Glenn Christopher [0000-0003-0779-4619]Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2020202020172020info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/200985reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/ENE2015-66183-Rhttp://dx.doi.org/10.1016/j.jpowsour.2017.08.011Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2009852026-05-22T06:33:51Z
dc.title.none.fl_str_mv Temperature dependence of partial conductivities of the BaZr0.7Ce0.2Y0.1O3-δ proton conductor
title Temperature dependence of partial conductivities of the BaZr0.7Ce0.2Y0.1O3-δ proton conductor
spellingShingle Temperature dependence of partial conductivities of the BaZr0.7Ce0.2Y0.1O3-δ proton conductor
Heras-Juaristi, Gemma
BZCY72
Transport numbers
Proton conductivity
Defect chemistry
EMF method
title_short Temperature dependence of partial conductivities of the BaZr0.7Ce0.2Y0.1O3-δ proton conductor
title_full Temperature dependence of partial conductivities of the BaZr0.7Ce0.2Y0.1O3-δ proton conductor
title_fullStr Temperature dependence of partial conductivities of the BaZr0.7Ce0.2Y0.1O3-δ proton conductor
title_full_unstemmed Temperature dependence of partial conductivities of the BaZr0.7Ce0.2Y0.1O3-δ proton conductor
title_sort Temperature dependence of partial conductivities of the BaZr0.7Ce0.2Y0.1O3-δ proton conductor
dc.creator.none.fl_str_mv Heras-Juaristi, Gemma
Pérez-Coll, Domingo
Mather, Glenn C.
author Heras-Juaristi, Gemma
author_facet Heras-Juaristi, Gemma
Pérez-Coll, Domingo
Mather, Glenn C.
author_role author
author2 Pérez-Coll, Domingo
Mather, Glenn C.
author2_role author
author
dc.contributor.none.fl_str_mv Ministerio de Economía y Competitividad (España)
Pérez-Coll, Domingo [0000-0001-5331-2516]
Mather, Glenn Christopher [0000-0003-0779-4619]
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv BZCY72
Transport numbers
Proton conductivity
Defect chemistry
EMF method
topic BZCY72
Transport numbers
Proton conductivity
Defect chemistry
EMF method
description [EN] Partial conductivities are presented for BaZrCeYO, an important proton conductor for protonic-ceramic fuel cells and membrane reactors. Atmospheric dependencies of impedance performed in humidified and dry O, air, N and H(10%)/N(90%) in the temperature range 300–900 °C, supported by the modified emf method, confirm significant electron-hole and protonic contributions to transport. For very reducing and wet atmospheres, the conductivity is predominantly ionic, with a higher participation of protons with decreasing temperature and increasing water-vapour partial pressure (pHO). From moderately reducing conditions of wet N to wet O, however, the conductivity is considerably influenced by electron holes as revealed by a significant dependence of total conductivity on oxygen partial pressure (pO). With higher pHO, proton transport increases, with a concomitant decrease of holes and oxygen vacancies. However, the effect of pHO is also influenced by temperature, with a greater protonic contribution at both lower temperature and pO. Values of proton transport number t ≈ 0.63 and electronic transport number t ≈ 0.37 are obtained at 600 °C for pHO = 0.022 atm and pO = 0.2 atm, whereas t ≈ 0.95 and t ≈ 0.05 for pO = 10 atm. A hydration enthalpy of −109 kJ mol is obtained in the range 600–900 °C.
publishDate 2017
dc.date.none.fl_str_mv 2017
2020
2020
2020
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/10261/200985
url http://hdl.handle.net/10261/200985
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/ENE2015-66183-R
http://dx.doi.org/10.1016/j.jpowsour.2017.08.011
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier BV
publisher.none.fl_str_mv Elsevier BV
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 15,811543

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