Crystal structure, cobalt and iron speciation and oxygen non-stoichiometry of La0.6Sr0.4Co1-yFeyO3-δ nanorods for IT-SOFC cathodes

Augusto E. Mejía Gómez; Joaquín Sacanell; Cristián Huck-Iriart; Cinthia P. Ramos; Analía L. Soldati; Santiago J.A. Figueroa; Manfredo H. Tabacniks; Márcia C.A. Fantini; Aldo F. Craievich; Diego G. Lamas

doi:10.1016/j.jallcom.2019.153250

Crystal structure, cobalt and iron speciation and oxygen non-stoichiometry of La_0.6Sr_0.4Co_1-yFe_yO_3-δ nanorods for IT-SOFC cathodes

Augusto E. Mejía Gómez, Joaquín Sacanell, Cristián Huck-Iriart, Cinthia P. Ramos, Analía L. Soldati, Santiago J.A. Figueroa, Manfredo H. Tabacniks, Márcia C.A. Fantini, Aldo F. Craievich, Diego G. Lamas

Department of Physics

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

Single-phased La_0.6Sr_0.4Co_1-yFe_yO_3-δ (y = 0.2, 0.5, 0.8) nanorods exhibiting the rhombohedral perovskite-type phase were synthesized by a pore-wetting technique. We studied their chemical composition, crystal and electronic structures, morphology and hyperfine properties as a function of the Co/Fe content of the samples. Our results demonstrate that Co cations exhibit a slightly lower oxidation state than Fe ones, resulting in a higher oxygen non-stoichiometry δ for Co-rich samples. In addition, the values of δ determined in this work for nanostructured samples are much higher than those reported in the literature for bulk materials. This can be attributed to the high number of defects in nanomaterials and is probably one important factor in the high electrochemical performance for the oxygen reduction reaction of nanostructured La_0.6Sr_0.4Co_1-yFe_yO_3-δ IT-SOFC cathodes, which have been reported in a previous work.

Original language	English
Article number	153250
Journal	Journal of Alloys and Compounds
Volume	817
DOIs	https://doi.org/10.1016/j.jallcom.2019.153250
State	Published - 15 Mar 2020

Keywords

Electrode materials
Mössbauer spectroscopy
NEXAFS
Nanostructured materials
X-ray diffraction

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10.1016/j.jallcom.2019.153250

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Mejía Gómez, A. E., Sacanell, J., Huck-Iriart, C., Ramos, C. P., Soldati, A. L., Figueroa, S. J. A., Tabacniks, M. H., Fantini, M. C. A., Craievich, A. F., & Lamas, D. G. (2020). Crystal structure, cobalt and iron speciation and oxygen non-stoichiometry of La_0.6Sr_0.4Co_1-yFe_yO_3-δ nanorods for IT-SOFC cathodes. Journal of Alloys and Compounds, 817, Article 153250. https://doi.org/10.1016/j.jallcom.2019.153250

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title = "Crystal structure, cobalt and iron speciation and oxygen non-stoichiometry of La0.6Sr0.4Co1-yFeyO3-δ nanorods for IT-SOFC cathodes",

abstract = "Single-phased La0.6Sr0.4Co1-yFeyO3-δ (y = 0.2, 0.5, 0.8) nanorods exhibiting the rhombohedral perovskite-type phase were synthesized by a pore-wetting technique. We studied their chemical composition, crystal and electronic structures, morphology and hyperfine properties as a function of the Co/Fe content of the samples. Our results demonstrate that Co cations exhibit a slightly lower oxidation state than Fe ones, resulting in a higher oxygen non-stoichiometry δ for Co-rich samples. In addition, the values of δ determined in this work for nanostructured samples are much higher than those reported in the literature for bulk materials. This can be attributed to the high number of defects in nanomaterials and is probably one important factor in the high electrochemical performance for the oxygen reduction reaction of nanostructured La0.6Sr0.4Co1-yFeyO3-δ IT-SOFC cathodes, which have been reported in a previous work.",

keywords = "Electrode materials, M{\"o}ssbauer spectroscopy, NEXAFS, Nanostructured materials, X-ray diffraction",

author = "{Mej{\'i}a G{\'o}mez}, {Augusto E.} and Joaqu{\'i}n Sacanell and Cristi{\'a}n Huck-Iriart and Ramos, {Cinthia P.} and Soldati, {Anal{\'i}a L.} and Figueroa, {Santiago J.A.} and Tabacniks, {Manfredo H.} and Fantini, {M{\'a}rcia C.A.} and Craievich, {Aldo F.} and Lamas, {Diego G.}",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",

year = "2020",

month = mar,

day = "15",

doi = "10.1016/j.jallcom.2019.153250",

language = "English",

volume = "817",

journal = "Journal of Alloys and Compounds",

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Mejía Gómez, AE, Sacanell, J, Huck-Iriart, C, Ramos, CP, Soldati, AL, Figueroa, SJA, Tabacniks, MH, Fantini, MCA, Craievich, AF & Lamas, DG 2020, 'Crystal structure, cobalt and iron speciation and oxygen non-stoichiometry of La_0.6Sr_0.4Co_1-yFe_yO_3-δ nanorods for IT-SOFC cathodes', Journal of Alloys and Compounds, vol. 817, 153250. https://doi.org/10.1016/j.jallcom.2019.153250

TY - JOUR

T1 - Crystal structure, cobalt and iron speciation and oxygen non-stoichiometry of La0.6Sr0.4Co1-yFeyO3-δ nanorods for IT-SOFC cathodes

AU - Mejía Gómez, Augusto E.

AU - Sacanell, Joaquín

AU - Huck-Iriart, Cristián

AU - Ramos, Cinthia P.

AU - Soldati, Analía L.

AU - Figueroa, Santiago J.A.

AU - Tabacniks, Manfredo H.

AU - Fantini, Márcia C.A.

AU - Craievich, Aldo F.

AU - Lamas, Diego G.

PY - 2020/3/15

Y1 - 2020/3/15

N2 - Single-phased La0.6Sr0.4Co1-yFeyO3-δ (y = 0.2, 0.5, 0.8) nanorods exhibiting the rhombohedral perovskite-type phase were synthesized by a pore-wetting technique. We studied their chemical composition, crystal and electronic structures, morphology and hyperfine properties as a function of the Co/Fe content of the samples. Our results demonstrate that Co cations exhibit a slightly lower oxidation state than Fe ones, resulting in a higher oxygen non-stoichiometry δ for Co-rich samples. In addition, the values of δ determined in this work for nanostructured samples are much higher than those reported in the literature for bulk materials. This can be attributed to the high number of defects in nanomaterials and is probably one important factor in the high electrochemical performance for the oxygen reduction reaction of nanostructured La0.6Sr0.4Co1-yFeyO3-δ IT-SOFC cathodes, which have been reported in a previous work.

AB - Single-phased La0.6Sr0.4Co1-yFeyO3-δ (y = 0.2, 0.5, 0.8) nanorods exhibiting the rhombohedral perovskite-type phase were synthesized by a pore-wetting technique. We studied their chemical composition, crystal and electronic structures, morphology and hyperfine properties as a function of the Co/Fe content of the samples. Our results demonstrate that Co cations exhibit a slightly lower oxidation state than Fe ones, resulting in a higher oxygen non-stoichiometry δ for Co-rich samples. In addition, the values of δ determined in this work for nanostructured samples are much higher than those reported in the literature for bulk materials. This can be attributed to the high number of defects in nanomaterials and is probably one important factor in the high electrochemical performance for the oxygen reduction reaction of nanostructured La0.6Sr0.4Co1-yFeyO3-δ IT-SOFC cathodes, which have been reported in a previous work.

KW - Electrode materials

KW - Mössbauer spectroscopy

KW - NEXAFS

KW - Nanostructured materials

KW - X-ray diffraction

UR - http://www.scopus.com/inward/record.url?scp=85076148757&partnerID=8YFLogxK

U2 - 10.1016/j.jallcom.2019.153250

DO - 10.1016/j.jallcom.2019.153250

M3 - Article

AN - SCOPUS:85076148757

SN - 0925-8388

VL - 817

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

M1 - 153250

ER -

Crystal structure, cobalt and iron speciation and oxygen non-stoichiometry of La_0.6Sr_0.4Co_1-yFe_yO_3-δ nanorods for IT-SOFC cathodes

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Keywords

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