USENKA, Alexandra; PANKOV, Vladimir; VIBHU, Vaibhav; FLURA, Aurelien; GRENIER, Jean-Claude; BASSAT, Jean-Marc.

doi:10.1149/09101.1341ecst

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USENKA, Alexandra
Institute of General of Inorganic Chemistry

PANKOV, Vladimir
Institute of General of Inorganic Chemistry

VIBHU, Vaibhav
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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ECS Transactions. 2019-08-30, vol. 91, n° 1, p. 1341-1353

Electrochemical Society, Inc.

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The present work is devoted to the investigation of temperature programmed oxygen desorption - sorption (TPD) processes performed on SOFC innovative cathode materials with Pr2-xLaxNiO4+δ composition. The experiments were performed using the coulometric titration technique involving an OXYLYT™ device, over the temperature cycle 20 – 900 – 20 °C. The considered parameters were the time and temperature dependences of both the titration current and the oxygen over-stoichiometry. TPD spectra of Pr2-xLaxNiO4+δ (x ≠ 0) exhibited two sharp peaks (maxima) of titration current with excellent resolution at p(O2) = 50 Pa, induced by removal of oxygen from different sites of the crystal lattice. TPD spectrum of Pr2NiO4+δ recorded under the same conditions drastically differs from the spectra of Pr2-xLaxNiO4+δ as four sharp maxima of titration current are detected. The TPD spectra of Pr2-xLaxNiO4+δ then strongly depend on the nature of the rare-earth (La or Pr) in link with the oxygen over-stoichiometry amount.< Réduire

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Temperature programmed oxygen desorption and sorption processes on Pr2-XLaxNiO4+δ nickelates

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