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

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Abstract

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.

Graphical abstract: Influence of annealing at intermediate temperature on oxygen transport kinetics of Pr2NiO4+δ

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Publication details

The article was received on 09 Oct 2017, accepted on 25 Mar 2018 and first published on 27 Mar 2018


Article type: Paper
DOI: 10.1039/C7TA08885J
Citation: J. Mater. Chem. A, 2018, Advance Article
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    Influence of annealing at intermediate temperature on oxygen transport kinetics of Pr2NiO4+δ

    S. Saher, J. Song, V. Vibhu, C. Nicollet, A. Flura, J. Bassat and H. J. M. Bouwmeester, J. Mater. Chem. A, 2018, Advance Article , DOI: 10.1039/C7TA08885J

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