Abstract: Design of materials for solid oxide fuel cells and oxygen/hydrogen separation membranes is important problem of modern hydrogen energy. In the current work, fundamentals of such materials design based on characterization of their real structure by modern methods, their oxygen mobility and reactivity by the temperature-programmed oxygen isotope exchange (TPIE) with C18O2 with detailed mathematical modeling for powdered samples are presented. They are comprised of complex oxides with mixed ionic-electronic conductivity (of perovskite, spinel, fluorite and Ruddlesden-Popper type structures, etc.), ionic conductors (doped ceria, zirconia, LAMOx, etc.) and their nanocomposites (including those with Ni alloy nanoparticles) prepared and sintered into a dense state by variety of methods including e-beam sintering. Unique sensitivity of TPIE methods allowed to demonstrate co-existence of several channels of oxygen migration in these systems with diffusion coefficients differing by several orders of magnitude. Fast channels of oxygen diffusion correspond to domain boundaries in nanocomposites; grain boundaries in complex oxides enriched by some cations as well as to cooperative mechanism of oxygen migration in oxides with asymmetric structures. Protonic conductors with high oxygen mobility possess also a high hydrogen mobility provided by hydroxyls jumps. Optimized by the chemical composition and nanodomain structure materials of these types demonstrated a high and stable performance as SOFC cathodes and anodes, asymmetric supported oxygen/hydrogen separation membranes in reactors used for transformation of biofuels into syngas and hydrogen. Support by the Russian Science Foundation (Project 23-73-00045) is gratefully acknowledged.

Cite: Sadykov V. , Eremeev N. , Bespalko Y. , Sadovskaya E. , Mikhailenko M. , Bryazgin A. , Korobeynikov M.
Design of Materials for Solid Oxide Fuel Cells and Oxygen Separation Membranes Based on Fundamental Studies of Their Oxygen Mobility and Surface Reactivity by Oxygen Isotope Heteroexchange
In compilation The 5th International Congress on Advanced Materials Science and Engineering: Abstract Book : AMSE 2024 : Time: July 23-26, 2024, Place: Opatija, Croatia. 2024. – C.123.

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