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

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

Risultato della ricerca: Articlepeer review

32 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

All Science Journal Classification (ASJC) codes

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

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