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dc.contributor.author
Acuña, Leandro Marcelo
dc.contributor.author
Muñoz, Fernando Francisco
dc.contributor.author
Fuentes, Rodolfo Oscar
dc.date.available
2018-05-04T21:44:11Z
dc.date.issued
2016-09
dc.identifier.citation
Acuña, Leandro Marcelo; Muñoz, Fernando Francisco; Fuentes, Rodolfo Oscar; Correlation between Structural, Chemical, and Electrochemical Properties of La 0.6 Sr 0.4 CoO 3– d Nanopowders for Application in Intermediate Temperature Solid Oxide Fuel Cells; American Chemical Society; Journal of Physical Chemistry C; 120; 36; 9-2016; 20387-20399
dc.identifier.issn
1932-7447
dc.identifier.uri
http://hdl.handle.net/11336/44248
dc.description.abstract
Lanthanum–strontium cobaltites are excellent mixed ionic and electronic conductors and exhibit good activity for the oxygen reduction reaction (ORR) at temperatures higher than 500 °C. This led to these materials being proposed as cathodes for solid-oxide fuel cell devices, either for the standard high temperature (SOFC, 900–1000 °C) or the intermediate temperature (IT-SOFC, 500–700 °C) range. Although it was determined that crystal structure and oxygen vacancies play a central role in these properties, little is known about cobalt speciation at SOFC or IT-SOFC working temperatures. In this study the cobalt speciation and local order of La0.6Sr0.4CoO3–d (LSC) is analyzed in detail for the first time in nano- and microstructured powders by means of in situ experiments using X-ray absorption spectroscopy (XAS) in the temperature range of 20–700 °C. The electrochemical performance of LSC-based cathodes in symmetrical cells under the same conditions is also studied using electrochemical impedance spectroscopy (EIS). Cobalt atoms can be found in any of the three possible oxidation states. Their relative amount depends on temperature and crystallite size. In crystallites of a few tens of nanometers, the ease with which Co atoms change their oxidation state is enhanced. This effect probably facilitates oxide transport in LSC-based cathodes.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
American Chemical Society
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Perovskites
dc.subject
Sofc
dc.subject
Xanes
dc.subject
Exafs
dc.subject.classification
Nano-materiales
dc.subject.classification
Nanotecnología
dc.subject.classification
INGENIERÍAS Y TECNOLOGÍAS
dc.title
Correlation between Structural, Chemical, and Electrochemical Properties of La 0.6 Sr 0.4 CoO 3– d Nanopowders for Application in Intermediate Temperature Solid Oxide Fuel Cells
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-05-04T14:57:42Z
dc.journal.volume
120
dc.journal.number
36
dc.journal.pagination
20387-20399
dc.journal.pais
Estados Unidos
dc.journal.ciudad
Washington
dc.description.fil
Fil: Acuña, Leandro Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones Científicas y Técnicas de las Fuerzas Armadas. Centro de Investigaciones en Sólidos; Argentina
dc.description.fil
Fil: Muñoz, Fernando Francisco. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones Científicas y Técnicas de las Fuerzas Armadas. Centro de Investigaciones en Sólidos; Argentina
dc.description.fil
Fil: Fuentes, Rodolfo Oscar. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.journal.title
Journal of Physical Chemistry C
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://dx.doi.org/10.1021/acs.jpcc.6b06622
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://pubs.acs.org/doi/10.1021/acs.jpcc.6b06622


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