Structural stability and catalytic activity of lanthanum-based perovskites

Lucia M. Petkovic, Vivek Utgikar, Sergey N. Rashkeev

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Perovskite-type oxide materials with a general formula La 1-xAxFe1-yCoyO3-δ, where A is an alkaline earth metal Sr or Ba, have been studied as cathode materials for catalytic reduction of oxygen in solid oxide fuel cells (SOFCs), as well as combustion catalysts. In this study, we use a combination of temperature-programmed reduction measurements, X-ray diffraction, carbon black catalytic oxidation measurements, and first-principles, density-functional- theory (DFT) calculations to elucidate the main processes that contribute to the structural stability and catalytic activity for soot oxidation of these materials. In particular, we investigate the dynamics of the structure reconstruction with oxygen loss during the regulated increase of the temperature. The calculations are in good qualitative agreement with catalytic experiments and allow us to identify special combinations of the perovskite chemical composition and local surface structures for which one could expect the highest catalytic activity for the soot oxidation process.

Original languageEnglish
Pages (from-to)8709-8715
Number of pages7
JournalJournal of Physical Chemistry C
Volume115
Issue number17
DOIs
Publication statusPublished - 5 May 2011
Externally publishedYes

Fingerprint

Soot
Lanthanum
structural stability
perovskites
lanthanum
catalytic activity
Catalyst activity
soot
Perovskite
oxidation
Alkaline Earth Metals
Oxygen
fuel combustion
Alkaline earth metals
Oxidation
alkaline earth metals
Catalytic oxidation
oxygen
solid oxide fuel cells
Carbon black

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Structural stability and catalytic activity of lanthanum-based perovskites. / Petkovic, Lucia M.; Utgikar, Vivek; Rashkeev, Sergey N.

In: Journal of Physical Chemistry C, Vol. 115, No. 17, 05.05.2011, p. 8709-8715.

Research output: Contribution to journalArticle

Petkovic, Lucia M. ; Utgikar, Vivek ; Rashkeev, Sergey N. / Structural stability and catalytic activity of lanthanum-based perovskites. In: Journal of Physical Chemistry C. 2011 ; Vol. 115, No. 17. pp. 8709-8715.
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