Oxygen Mobility in the Materials for Solid Oxide Fuel Cells and Catalytic Membranes (Review)

V. A. Sadykov; E. M. Sadovskaya; N. F. Eremeev; P. I. Skriabin; A. V. Krasnov; Yu. N. Bespalko; S. N. Pavlova; Yu. E. Fedorova; E. Yu. Pikalova; A. V. Shlyakhtina

doi:10.1134/S1023193519080147

Oxygen Mobility in the Materials for Solid Oxide Fuel Cells and Catalytic Membranes (Review)

Authors: Sadykov V.A.¹^,2, Sadovskaya E.M.¹^,2, Eremeev N.F.¹, Skriabin P.I.¹, Krasnov A.V.¹, Bespalko Y.N.¹, Pavlova S.N.¹, Fedorova Y.E.¹, Pikalova E.Y.³^,4, Shlyakhtina A.V.⁵
Affiliations:
1. Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences
2. Novosibirsk State University, Department of Natural Sciences
3. Institute of High-Temperature Electrochemistry, Ural Branch, Russian Academy of Sciences
4. Ural Federal University
5. Semenov Institute of Chemical Physics, Russian Academy of Sciences
Issue: Vol 55, No 8 (2019)
Pages: 701-718
Section: Article
URL: https://journals.rcsi.science/1023-1935/article/view/190767
DOI: https://doi.org/10.1134/S1023193519080147
ID: 190767

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Abstract

Oxygen transport (including oxygen mobility and surface reactivity) is one of the important factors governing electrochemical activity of solid oxide fuel cells electrodes as well as oxygen and hydrogen separation membranes based on materials with mixed oxide-ionic and electronic conductivity. In this work, oxygen mobility data obtained for a series of materials destined for such devices using modern techniques of oxygen isotope heteroexchange are summarized. Series of solid oxide fuel cells’ and membranes’ materials were studied by isotope exchange of their oxygen with ¹⁸O₂ and C¹⁸O₂ in isothermal and temperature-programmed modes using closed and flow reactors and data analysis based on developed model of oxygen diffusion and exchange. For solid electrolytes’ materials (Sc- and Ce-doped zirconia) as well as for proton-conducting materials [Ln_5.5(Mo,W)O_11.25], the effect of composition heterogeneity on the oxygen mobility was demonstrated. For Ln_{6 – x}WO_12 – δ, a strong effect of structure on the oxygen mobility was demonstrated. For oxides with asymmetric structure, where oxygen migration proceeds via cooperative mechanisms [La₂(Mo,W)₂O₉, (Ln,Ca)₂NiO₄], the doping hampers the cooperative migration, resulting in oxygen mobility deterioration and sometimes forming additional slow diffusion channels. In the PrNi_0.5Co_0.5O₃–Ce_0.9Y_0.1O₂ nanocomposites that are materials of the solid oxide fuel cells’ cathode and functional layer of the oxygen separation membranes, two diffusion channels were observed, where more mobile oxygen corresponds to the fluorite phase and interfaces; less mobile, to the perovskite phase. This is due to special features of cations redistribution between the phases.

Keywords

isotope exchange of oxygen, self-diffusion, doped ceria/zirconia, doped lanthanum silicates, complex praseodymium nickelates/cobaltites, layered lanthanide nickelates, lanthanide molybdates/tungstates, composites

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Oxygen Mobility in the Materials for Solid Oxide Fuel Cells and Catalytic Membranes (Review)

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Abstract

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About the authors

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