Palladium local structure of La1-xSrxCo1-yFey-0.03Pd0.03O3-δperovskites synthesized using a one pot citrate method

Antonino Martorana, Fabrizio Puleo, Leonarda Francesca Liotta, Alessandro Longo, Valeria La Parola, Antonino Martorana, Alessandro Longo, Leonarda F. Liotta, Dipanjan Banerjee, Valeria La Parola

Risultato della ricerca: Article

25 Citazioni (Scopus)

Abstract

Nanostructured La1-xSrxCo1-yFey-0.03Pd0.03O3-δ(LSCF-Pd) perovskites with fixed La-Sr composition (x = 0.4) and two different Fe contents (y = 0.2 and 0.8) were successfully synthesized using a one pot citrate method starting from nitrates of the metal cations. Pd-free La1-xSrxCo1-yFeyO3-δ(LSCF) systems were prepared for comparison. LSCF powders were calcined at 1300 °C and characterized by XRD and Rietveld refinement, EXAFS, XPS, TPR analyses. Promotion of La0.6Sr0.4Co0.8Fe0.2O3-δand of La0.6Sr0.4Co0.2Fe0.8O3-δby incorporation of palladium was evidenced by solving the local environment of Pd using EXAFS spectroscopy. XPS analyses, in agreement with TPR measurements, demonstrated an increase of superficial oxygen vacancies, the variation being much more pronounced in the La0.6Sr0.4Co0.8Fe0.17Pd0.03O3-δsample. It is argued that this increase is associated with the introduction of Pd in the B site of LSCF. Moreover, ionic Pd4+was detected as the only palladium species on the perovskite surface, whereas Pd metal clusters of about 2 nm, not detectable in the surface, are embedded in the matrix and strongly interact with the bulk. This result has strong consequences in the synthesis and in the design of new perovskite materials that can be used as cathodes in fuel cell application at intermediate operating temperatures. © the Partner Organisations 2014.
Lingua originaleEnglish
pagine (da-a)22677-22686
Numero di pagine10
RivistaPhysical Chemistry Chemical Physics
Volume16
Stato di pubblicazionePublished - 2014

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Palladium
citrates
perovskites
Citric Acid
palladium
X ray photoelectron spectroscopy
Metals
Extended X ray absorption fine structure spectroscopy
Rietveld refinement
promotion
metal clusters
Oxygen vacancies
operating temperature
Nitrates
Powders
fuel cells
Cations
nitrates
Fuel cells
Cathodes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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Palladium local structure of La1-xSrxCo1-yFey-0.03Pd0.03O3-δperovskites synthesized using a one pot citrate method. / Martorana, Antonino; Puleo, Fabrizio; Liotta, Leonarda Francesca; Longo, Alessandro; La Parola, Valeria; Martorana, Antonino; Longo, Alessandro; Liotta, Leonarda F.; Banerjee, Dipanjan; Parola, Valeria La.

In: Physical Chemistry Chemical Physics, Vol. 16, 2014, pag. 22677-22686.

Risultato della ricerca: Article

@article{f9df12414ce845bf945b3f9458e6ccce,
title = "Palladium local structure of La1-xSrxCo1-yFey-0.03Pd0.03O3-{\^I}´perovskites synthesized using a one pot citrate method",
abstract = "Nanostructured La1-xSrxCo1-yFey-0.03Pd0.03O3-{\^I}´(LSCF-Pd) perovskites with fixed La-Sr composition (x = 0.4) and two different Fe contents (y = 0.2 and 0.8) were successfully synthesized using a one pot citrate method starting from nitrates of the metal cations. Pd-free La1-xSrxCo1-yFeyO3-{\^I}´(LSCF) systems were prepared for comparison. LSCF powders were calcined at 1300 {\^A}°C and characterized by XRD and Rietveld refinement, EXAFS, XPS, TPR analyses. Promotion of La0.6Sr0.4Co0.8Fe0.2O3-{\^I}´and of La0.6Sr0.4Co0.2Fe0.8O3-{\^I}´by incorporation of palladium was evidenced by solving the local environment of Pd using EXAFS spectroscopy. XPS analyses, in agreement with TPR measurements, demonstrated an increase of superficial oxygen vacancies, the variation being much more pronounced in the La0.6Sr0.4Co0.8Fe0.17Pd0.03O3-{\^I}´sample. It is argued that this increase is associated with the introduction of Pd in the B site of LSCF. Moreover, ionic Pd4+was detected as the only palladium species on the perovskite surface, whereas Pd metal clusters of about 2 nm, not detectable in the surface, are embedded in the matrix and strongly interact with the bulk. This result has strong consequences in the synthesis and in the design of new perovskite materials that can be used as cathodes in fuel cell application at intermediate operating temperatures. {\^A}{\circledC} the Partner Organisations 2014.",
keywords = "Physics and Astronomy (all); Physical and Theoretical Chemistry",
author = "Antonino Martorana and Fabrizio Puleo and Liotta, {Leonarda Francesca} and Alessandro Longo and {La Parola}, Valeria and Antonino Martorana and Alessandro Longo and Liotta, {Leonarda F.} and Dipanjan Banerjee and Parola, {Valeria La}",
year = "2014",
language = "English",
volume = "16",
pages = "22677--22686",
journal = "Physical Chemistry Chemical Physics",
issn = "1463-9076",
publisher = "Royal Society of Chemistry",

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T1 - Palladium local structure of La1-xSrxCo1-yFey-0.03Pd0.03O3-δperovskites synthesized using a one pot citrate method

AU - Martorana, Antonino

AU - Puleo, Fabrizio

AU - Liotta, Leonarda Francesca

AU - Longo, Alessandro

AU - La Parola, Valeria

AU - Martorana, Antonino

AU - Longo, Alessandro

AU - Liotta, Leonarda F.

AU - Banerjee, Dipanjan

AU - Parola, Valeria La

PY - 2014

Y1 - 2014

N2 - Nanostructured La1-xSrxCo1-yFey-0.03Pd0.03O3-δ(LSCF-Pd) perovskites with fixed La-Sr composition (x = 0.4) and two different Fe contents (y = 0.2 and 0.8) were successfully synthesized using a one pot citrate method starting from nitrates of the metal cations. Pd-free La1-xSrxCo1-yFeyO3-δ(LSCF) systems were prepared for comparison. LSCF powders were calcined at 1300 °C and characterized by XRD and Rietveld refinement, EXAFS, XPS, TPR analyses. Promotion of La0.6Sr0.4Co0.8Fe0.2O3-δand of La0.6Sr0.4Co0.2Fe0.8O3-δby incorporation of palladium was evidenced by solving the local environment of Pd using EXAFS spectroscopy. XPS analyses, in agreement with TPR measurements, demonstrated an increase of superficial oxygen vacancies, the variation being much more pronounced in the La0.6Sr0.4Co0.8Fe0.17Pd0.03O3-δsample. It is argued that this increase is associated with the introduction of Pd in the B site of LSCF. Moreover, ionic Pd4+was detected as the only palladium species on the perovskite surface, whereas Pd metal clusters of about 2 nm, not detectable in the surface, are embedded in the matrix and strongly interact with the bulk. This result has strong consequences in the synthesis and in the design of new perovskite materials that can be used as cathodes in fuel cell application at intermediate operating temperatures. © the Partner Organisations 2014.

AB - Nanostructured La1-xSrxCo1-yFey-0.03Pd0.03O3-δ(LSCF-Pd) perovskites with fixed La-Sr composition (x = 0.4) and two different Fe contents (y = 0.2 and 0.8) were successfully synthesized using a one pot citrate method starting from nitrates of the metal cations. Pd-free La1-xSrxCo1-yFeyO3-δ(LSCF) systems were prepared for comparison. LSCF powders were calcined at 1300 °C and characterized by XRD and Rietveld refinement, EXAFS, XPS, TPR analyses. Promotion of La0.6Sr0.4Co0.8Fe0.2O3-δand of La0.6Sr0.4Co0.2Fe0.8O3-δby incorporation of palladium was evidenced by solving the local environment of Pd using EXAFS spectroscopy. XPS analyses, in agreement with TPR measurements, demonstrated an increase of superficial oxygen vacancies, the variation being much more pronounced in the La0.6Sr0.4Co0.8Fe0.17Pd0.03O3-δsample. It is argued that this increase is associated with the introduction of Pd in the B site of LSCF. Moreover, ionic Pd4+was detected as the only palladium species on the perovskite surface, whereas Pd metal clusters of about 2 nm, not detectable in the surface, are embedded in the matrix and strongly interact with the bulk. This result has strong consequences in the synthesis and in the design of new perovskite materials that can be used as cathodes in fuel cell application at intermediate operating temperatures. © the Partner Organisations 2014.

KW - Physics and Astronomy (all); Physical and Theoretical Chemistry

UR - http://hdl.handle.net/10447/278285

M3 - Article

VL - 16

SP - 22677

EP - 22686

JO - Physical Chemistry Chemical Physics

JF - Physical Chemistry Chemical Physics

SN - 1463-9076

ER -