Temperature Programmed Oxygen Desorption and Sorption Processes on Pr2-XLaxNiO4+δ Nickelates

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...

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Bibliographic Details
Published in:ECS transactions 2019-08, Vol.91 (1), p.1341-1353
Main Authors: Usenka, Alexandra, Pankov, Vladimir, Vibhu, Vaibhav, Flura, Aurélien, Grenier, Jean-Claude, Bassat, Jean-Marc
Format: Article
Language:English
Subjects:
Chemical Sciences
Material chemistry
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Summary: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.
ISSN:1938-5862
1938-6737
DOI:10.1149/09101.1341ecst