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Oxygen mobility and surface reactivity of Sm-doped Pr nickelates as promising materials for solid oxide cell air electrodes

Nikita Eremeev, Ekaterina Sadovskaya, Yulia Bespalko, Ekaterina Smal, Elena Pikalova, Olga Bulavchenko, Evgeny Suprun, Mikhail Mikhailenko, Mikhail Korobeynikov, Vladislav Sadykov

Abstract


First-order Ruddlesden–Popper phases A2BO4+δ are promising air electrode materials for solid oxide fuel cell and electrolyzer due to their high oxygen mobility. Doping the A site with smaller lanthanide cations offers a potential route to further enhance this property, yet experimental results remain controversial. In this work, for the first time, Pr2−xSmxNiO4+δ (x = 0.2 and 0.4) are synthesized using both conventional furnace sintering and radiation-thermal sintering by electron beam, and their oxygen transport properties are systematically evaluated. Single-phase materials are obtained at 1150 °C, and scanning electron microscopy reveals porous ceramics — a key microstructural feature for electrodes. Oxygen mobility and surface reactivity are assessed by temperature-programmed isotope exchange with C18O2 and 18O2. The oxygen heteroexchange rate shows minimal dependence on Sm content, but is strongly influenced by sintering technique and temperature, reflecting surface-sensitive effects. The oxygen tracer diffusion coefficients of Sm-doped Pr nickelates are lower compared to those for undoped Pr nickelate; however, they remain sufficiently high for practical application. Radiation-thermally sintered samples exhibit the highest oxygen tracer diffusion coefficients (up to 2.5·10−7 cm2/s at 700 °C) amongst Sm-doped Pr nickelates, attributed to electron-beam-induced structural disordering, strain, and defect generation. These findings establish Sm-doped praseodymium nickelates as promising electrode materials and highlight radiation-thermal sintering as an effective route for fabricating porous ceramics with enhanced transport properties.

Keywords


solid oxide fuel cells; solid oxide electrolyzers; layered nickelates; radiation-thermal sintering; oxygen mobility; isotope exchange of oxygen

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References


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DOI: https://doi.org/10.15826/chimtech.10130

Copyright (c) 2026 Nikita Eremeev, Ekaterina Sadovskaya, Yulia Bespalko, Ekaterina Smal, Elena Pikalova, Olga Bulavchenko, Evgeny Suprun, Mikhail Mikhailenko, Mikhail Korobeynikov, Vladislav Sadykov

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