Implications of Cation Interdiffusion between Double Perovskite Cathode and Proton-Conducting Electrolyte for Performance of Solid Oxide Fuel Cells

Nadezhda S. Tsvetkova (), Dmitry A. Malyshkin, Ivan L. Ivanov, Dmitry S. Tsvetkov and Andrey Yu. Zuev ()
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Nadezhda S. Tsvetkova: Institute of Natural Sciences and Mathematics, Ural Federal University, 19 Mira St., 620002 Ekaterinburg, Russia
Dmitry A. Malyshkin: Laboratory of Hydrogen Energy, Ural Federal University, 19 Mira St., 620002 Ekaterinburg, Russia
Ivan L. Ivanov: Laboratory of Hydrogen Energy, Ural Federal University, 19 Mira St., 620002 Ekaterinburg, Russia
Dmitry S. Tsvetkov: Institute of Natural Sciences and Mathematics, Ural Federal University, 19 Mira St., 620002 Ekaterinburg, Russia
Andrey Yu. Zuev: Institute of Natural Sciences and Mathematics, Ural Federal University, 19 Mira St., 620002 Ekaterinburg, Russia

Energies, 2023, vol. 16, issue 7, 1-12

Abstract: Chemical compatibility and cation interdiffusion between the double perovskite cobaltites R BaCo 2 O 6−δ ( R = Gd, Pr) and proton-conducting electrolyte BaZr 0.8 Y 0.2 O 3−δ were studied. Chemical interaction was found to occur already at 1100 °C as a result of the partial dissolution of R BaCo 2 O 6−δ ( R = Gd, Pr) in BaZr 0.8 Y 0.2 O 3−δ . Analysis of the element distribution along the cross sections of diffusion couples R BaCo 2 O 6−δ ( R = Gd, Pr)|BaZr 0.8 Y 0.2 O 3−δ showed strong interdiffusion of cations, with cobalt being the most mobile one. Its diffusion depth in the electrolyte reaches up to several hundreds of micrometers. The addition of NiO as a sintering aid to BaZr 0.8 Y 0.2 O 3−δ promotes cation diffusion especially through the grain boundary mechanism, increasing the diffusion depth of Co. The possible implications of cation interdiffusion on the performance of proton-conducting SOFCs are discussed based on the results obtained.

Keywords: solid oxide fuel cells; cation interdiffusion; double perovskites; cathode materials; proton-conducting solid electrolyte (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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