Cobalt–iron red–ox behavior in nanostructured La0.4Sr0.6Co0.8Fe0.2O3−δ cathodes

Analía L. Soldati, Laura Baqué, Federico Napolitano, Adriana Serquis

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Nano-sized La0.4Sr0.6Co0.8Fe0.2O3−δ (LSCF) perovskite samples (prepared by a conventional acetate route and a novel acetate synthesis with HMTA additives), were tested simulating a red–ox cycle. The crystallography was studied by X-ray Powder Diffraction (XPD) and the changes in the oxidation state of the perovskite B-site were evaluated by synchrotron X-ray Absorption Near Edge Spectroscopy (XANES). After a reducing treatment, LSFC particles show the appearance of a new phase that coexists with the original one. The structural change is accompanied by a Co and Fe formal oxidation states decrease, although Fe remains always closer to 4+ and Co closer to 3+. The treatment produces a B-site valence average reduction from 3.52+ to 3.26+ and the formation of oxygen vacancies. A re-oxidation treatment under O2 rich atmosphere at 800°C for 10h shows that the change is reversible and independent of the two chemical methods used to synthesize the LSCF nano-particles.
Original languageEnglish
JournalJournal of Solid State Chemistry
Volume198
Pages (from-to)253-261
ISSN0022-4596
DOIs
Publication statusPublished - 2013

Keywords

  • LSCF
  • Cathodes
  • Fuel cell
  • Perovskite
  • B-site

Cite this

Soldati, Analía L. ; Baqué, Laura ; Napolitano, Federico ; Serquis, Adriana. / Cobalt–iron red–ox behavior in nanostructured La0.4Sr0.6Co0.8Fe0.2O3−δ cathodes. In: Journal of Solid State Chemistry. 2013 ; Vol. 198. pp. 253-261.
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title = "Cobalt–iron red–ox behavior in nanostructured La0.4Sr0.6Co0.8Fe0.2O3−δ cathodes",
abstract = "Nano-sized La0.4Sr0.6Co0.8Fe0.2O3−δ (LSCF) perovskite samples (prepared by a conventional acetate route and a novel acetate synthesis with HMTA additives), were tested simulating a red–ox cycle. The crystallography was studied by X-ray Powder Diffraction (XPD) and the changes in the oxidation state of the perovskite B-site were evaluated by synchrotron X-ray Absorption Near Edge Spectroscopy (XANES). After a reducing treatment, LSFC particles show the appearance of a new phase that coexists with the original one. The structural change is accompanied by a Co and Fe formal oxidation states decrease, although Fe remains always closer to 4+ and Co closer to 3+. The treatment produces a B-site valence average reduction from 3.52+ to 3.26+ and the formation of oxygen vacancies. A re-oxidation treatment under O2 rich atmosphere at 800°C for 10h shows that the change is reversible and independent of the two chemical methods used to synthesize the LSCF nano-particles.",
keywords = "LSCF, Cathodes, Fuel cell, Perovskite, B-site",
author = "Soldati, {Anal{\'i}a L.} and Laura Baqu{\'e} and Federico Napolitano and Adriana Serquis",
year = "2013",
doi = "10.1016/j.jssc.2012.10.019",
language = "English",
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Cobalt–iron red–ox behavior in nanostructured La0.4Sr0.6Co0.8Fe0.2O3−δ cathodes. / Soldati, Analía L.; Baqué, Laura; Napolitano, Federico; Serquis, Adriana.

In: Journal of Solid State Chemistry, Vol. 198, 2013, p. 253-261.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Cobalt–iron red–ox behavior in nanostructured La0.4Sr0.6Co0.8Fe0.2O3−δ cathodes

AU - Soldati, Analía L.

AU - Baqué, Laura

AU - Napolitano, Federico

AU - Serquis, Adriana

PY - 2013

Y1 - 2013

N2 - Nano-sized La0.4Sr0.6Co0.8Fe0.2O3−δ (LSCF) perovskite samples (prepared by a conventional acetate route and a novel acetate synthesis with HMTA additives), were tested simulating a red–ox cycle. The crystallography was studied by X-ray Powder Diffraction (XPD) and the changes in the oxidation state of the perovskite B-site were evaluated by synchrotron X-ray Absorption Near Edge Spectroscopy (XANES). After a reducing treatment, LSFC particles show the appearance of a new phase that coexists with the original one. The structural change is accompanied by a Co and Fe formal oxidation states decrease, although Fe remains always closer to 4+ and Co closer to 3+. The treatment produces a B-site valence average reduction from 3.52+ to 3.26+ and the formation of oxygen vacancies. A re-oxidation treatment under O2 rich atmosphere at 800°C for 10h shows that the change is reversible and independent of the two chemical methods used to synthesize the LSCF nano-particles.

AB - Nano-sized La0.4Sr0.6Co0.8Fe0.2O3−δ (LSCF) perovskite samples (prepared by a conventional acetate route and a novel acetate synthesis with HMTA additives), were tested simulating a red–ox cycle. The crystallography was studied by X-ray Powder Diffraction (XPD) and the changes in the oxidation state of the perovskite B-site were evaluated by synchrotron X-ray Absorption Near Edge Spectroscopy (XANES). After a reducing treatment, LSFC particles show the appearance of a new phase that coexists with the original one. The structural change is accompanied by a Co and Fe formal oxidation states decrease, although Fe remains always closer to 4+ and Co closer to 3+. The treatment produces a B-site valence average reduction from 3.52+ to 3.26+ and the formation of oxygen vacancies. A re-oxidation treatment under O2 rich atmosphere at 800°C for 10h shows that the change is reversible and independent of the two chemical methods used to synthesize the LSCF nano-particles.

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KW - Cathodes

KW - Fuel cell

KW - Perovskite

KW - B-site

U2 - 10.1016/j.jssc.2012.10.019

DO - 10.1016/j.jssc.2012.10.019

M3 - Journal article

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SP - 253

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JO - Journal of Solid State Chemistry

JF - Journal of Solid State Chemistry

SN - 0022-4596

ER -