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 [Ln5.5(Mo,W)O11.25], the effect of composition heterogeneity on the oxygen mobility was demonstrated. For Ln6 – xWO12 – 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 do** hampers the cooperative migration, resulting in oxygen mobility deterioration and sometimes forming additional slow diffusion channels. In the PrNi0.5Co0.5O3–Ce0.9Y0.1O2 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.
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ACKNOWLEDGMENTS
Authors are grateful to the Organizers of the International Conference “Fundamental problems of solid state ionics” (Chernogolovka, Russia, September 9–13, 2018).
Funding
The reported study was funded in part by RSF (project no. 16-13-00112), the budget project for Boreskov Institute of Catalysis, Siberian Division of Russian Academy of Sciences (project no. АААА-А17-117041110045-9), Institute of High-Temperature Electrochemistry, Ural Division of Russian Academy of Sciences, and subsidized from the Governmental order of Semenov Institute of Chemical Physics, Russian Academy of Sciences (project no. 0052-2014-0011 “nanochemistry”, registration no. АААА-А17-111711600093 – 8), and also by RFBR (projects nos. 16-03-00143, 18-38-20063 mol_а_ved).
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Based on the paper presented at the XIV Meeting “Fundamental Problems of Solid State Ionics,” Chernogolovka (Russia), September 9–13, 2018.
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Sadykov, V.A., Sadovskaya, E.M., Eremeev, N.F. et al. Oxygen Mobility in the Materials for Solid Oxide Fuel Cells and Catalytic Membranes (Review). Russ J Electrochem 55, 701–718 (2019). https://doi.org/10.1134/S1023193519080147
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DOI: https://doi.org/10.1134/S1023193519080147