PrBaCo 2 O 6?? -Ce 0.8 Sm 0.2 O 1.9 Composite Cathodes for Intermediate-Temperature Solid Oxide Fuel Cells: Stability and Cation Interdiffusion

Dmitry Tsvetkov, Nadezhda Tsvetkova, Ivan Ivanov, Dmitry Malyshkin, Vladimir Sereda and Andrey Zuev
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Dmitry Tsvetkov: Department of Physical and Inorganic Chemistry, Institute of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg 620000, Russia
Nadezhda Tsvetkova: Department of Physical and Inorganic Chemistry, Institute of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg 620000, Russia
Ivan Ivanov: Department of Physical and Inorganic Chemistry, Institute of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg 620000, Russia
Dmitry Malyshkin: Department of Physical and Inorganic Chemistry, Institute of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg 620000, Russia
Vladimir Sereda: Department of Physical and Inorganic Chemistry, Institute of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg 620000, Russia
Andrey Zuev: Department of Physical and Inorganic Chemistry, Institute of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg 620000, Russia

Energies, 2019, vol. 12, issue 3, 1-12

Abstract: The single-phase oxide PrBaCo 2 O 6−δ and composites (100 − y )PrBaCo 2 O 6−δ - y Ce 0.8 Sm 0.2 O 1.9 ( y = 10–30 wt.%) were investigated as cathode materials for intermediate-temperature solid oxide fuel cells. The chemical compatibility, cation interdiffusion, thermal expansion and dc conductivity were studied. As a result, strong interdiffusion of Pr and Sm was found between PrBaCo 2 O 6−δ and Ce 0.8 Sm 0.2 O 1.9 . This leads to only insignificantly decreasing thermal expansion coefficient of composite with increasing fraction of Ce 0.8 Sm 0.2 O 1.9 and, thus, mixing PrBaCo 2 O 6−δ with Ce 0.8 Sm 0.2 O 1.9 does not improve thermal expansion behavior of the cathode material. Moreover, formation of poorly-conducting BaCeO 3 , caused by chemical interaction between the double perovskite and doped ceria, was shown to lead to pronounced drop in the electrical conductivity of the composite cathode material with increasing Ce 0.8 Sm 0.2 O 1.9 content.

Keywords: double perovskite; solid oxide fuel cells; chemical compatibility; interdiffusion; electrical conductivity; thermal expansion (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: 2019
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