SAHER, Saim; SONG, Jia; VIBHU, Vaibhav; NICOLLET, Clément; FLURA, Aurelien; BASSAT, Jean-Marc.; BOUWMEESTER, Henny J. M.

doi:10.1039/c7ta08885j

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SAHER, Saim
Institute for Nanotechnology [MESA+]

SONG, Jia
Institute for Nanotechnology [MESA+]

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

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Journal of Materials Chemistry A. 2018, vol. 6, n° 18, p. 8331-8339

Royal Society of Chemistry

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Electrical conductivity relaxation (ECR) and oxygen permeation measurements were conducted, at 750 °C, to assess the long-term oxygen transport characteristics of the mixed ionic–electronic conducting Pr2NiO4+δ with a K2NiF4 structure. The results show that the apparent values for the oxygen diffusion and surface exchange coefficients extracted from the data and the associated oxygen flux increase over 120 h by 1–2 orders of magnitude. The results of post-mortem X-ray diffraction analysis of the samples show partial to virtually complete decomposition of Pr2NiO4+δ under the conditions of the experiments to Pr4Ni3O10+δ, PrNiO3−δ, Pr6O11, and traces of NiO. Pulse 18O–16O isotopic exchange (PIE) measurements confirmed fast surface exchange kinetics of the higher-order Ruddlesden–Popper phase Pr4Ni3O10+δ and Pr6O11 formed upon decomposition. Additional factors related to the microstructure, however, need to be considered to explain the observations.< Réduire

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Influence of annealing at intermediate temperature on oxygen transport kinetics of Pr2NiO4+d

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