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dc.contributor.author
Acuña, Leandro Marcelo
dc.contributor.author
Cabezas, Marcelo Daniel
dc.contributor.author
Fuentes, Rodolfo Oscar
dc.date.available
2023-11-02T15:35:34Z
dc.date.issued
2022-06
dc.identifier.citation
Acuña, Leandro Marcelo; Cabezas, Marcelo Daniel; Fuentes, Rodolfo Oscar; Improvement on the electrochemical performance by morphology control of nanostructured La0.6Sr0.4CoO3-δ-Gd0.1Ce0.9O1.95cathodes for IT-SOFC; Royal Society of Chemistry; Energy Advances; 6; 6-2022; 344-356
dc.identifier.issn
2753-1457
dc.identifier.uri
http://hdl.handle.net/11336/216877
dc.description.abstract
The effect of the particle's shape of Gd0.1Ce0.9O2-d (GDC) nanopowders on the electrochemical performance of La0.6Sr0.4CoO3-δ (LSC)-GDC composite cathodes was experimentally studied by electrochemical impedance spectroscopy (EIS). Composites were made of nanostructured LSC perovskite (average crystallite size D = 30 nm) mixed with nanostructured GDC powder (D = 8 nm) of irregular particle shape or with spherical particles of 200 nm diameter. Symmetrical cells (cathode/electrolyte/cathode) with different weight ratios of LSC:GDC (100: 0, 75 : 25, 50: 50 and 25 : 75 wt%) thick cathodes were fabricated by the screen-printing method and tested by EIS in the temperature range of 500-700 °C under a synthetic air flow of 100 mL min-1. These nanostructured composite materials exhibited excellent performance (area-specific resistance - ASR - values in the range of 0.019-0.032 Ω cm2 for an operating temperature of 700 °C). The best performance was achieved at a weight ratio of 75 : 25 wt% (LSC:GDC) when nanostructured GDC spheres were employed. This enhanced performance can be attributed to GDC morphology along with GDC anionic conduction, which prevent the blocking of LSC electrochemical reaction sites on surface, keeping them active by depleting its surface of adsorbed and reduced oxygen. The limiting processes were determined to take place on the LSC surface. New insight on cobalt's speciation under working-like conditions, determined by in situ X-ray Absorption Spectroscopy (XAS) experiments, suggests that the ease of cobalt atoms for changing their oxidation state is the key feature that rules the electrochemical activity of LSC and an atomistic model that explains it is proposed.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Royal Society of Chemistry
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc/2.5/ar/
dc.subject
Cathodes
dc.subject
SOFC
dc.subject
EIS
dc.subject
XAS
dc.subject.classification
Físico-Química, Ciencia de los Polímeros, Electroquímica
dc.subject.classification
Ciencias Químicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Improvement on the electrochemical performance by morphology control of nanostructured La0.6Sr0.4CoO3-δ-Gd0.1Ce0.9O1.95cathodes for IT-SOFC
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2023-11-01T11:07:30Z
dc.journal.number
6
dc.journal.pagination
344-356
dc.journal.pais
Reino Unido
dc.journal.ciudad
London
dc.description.fil
Fil: Acuña, Leandro Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Investigación y Desarrollo Estratégico para la Defensa. Ministerio de Defensa. Unidad de Investigación y Desarrollo Estratégico para la Defensa; Argentina
dc.description.fil
Fil: Cabezas, Marcelo Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Investigación y Desarrollo Estratégico para la Defensa. Ministerio de Defensa. Unidad de Investigación y Desarrollo Estratégico para la Defensa; Argentina
dc.description.fil
Fil: Fuentes, Rodolfo Oscar. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Constituyentes | Comision Nacional de Energia Atomica. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia. Unidad Ejecutora Instituto de Nanociencia y Nanotecnologia - Nodo Constituyentes.; Argentina
dc.journal.title
Energy Advances
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://pubs.rsc.org/en/content/articlelanding/2022/YA/D2YA00085G
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1039/d2ya00085g
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