Structure, chemical stability and electrical properties of BaCe0.9Y0.1O3−δ modified with V2O5

Abstract

Wet vacuum impregnation method was applied in order to evaluate the possibility of the formation of the material in BaCe 0.9 Y 0.1 O 3-d -V 2 O 5 system. Single-phase BaCe 0.9 Y 0.1 O 3-d samples, synthesised by solid-state reaction method, were impregnated with the solution of vanadium(V) oxide precursor. Multi-step, multi-cycle impregnation procedure was applied to enhance the impregnation efficiency. Partial decomposition of Y-doped BaCeO 3 in contact with the solution of the precursor, resulting in the formation of vanadium containing phases (CeVO 4 and BaV 2 O 6 ) on the materials surface, was observed. However, the presence of vanadium was also confirmed for the inner parts of the materials. The synthesised materials were submitted for exposition test to evaluate their chemical stability towards CO 2 /H 2 O. All BaCe 0.9 Y 0.1 O 3based materials modified by impregnation revealed higher chemical stability in comparison with single-phase un-modified BaCe 0.9 Y 0.1 O 3-d , since the amount of barium carbonate formed during the exposition was significantly lower. The total electrical conductivity of the received multi-phase materials was generally slightly lower than for the reference BaCe 0.9 Y 0.1 O 3-d sample, since the presence of the additional phases had a blocking effect on materials conductivity. The values of BaCeO 3 lattice parameters and the Seebeck coefficient did not show the modification of the defects structure of Y-doped BaCeO 3 during applied synthesis procedure.

Toward improved chemical stability of yttrium‐doped barium cerate by the introduction of nickel oxide

“…Overall, the degradation behavior obtained for the unmodified samples, therefore, agrees with previous reports of proton‐conducting perovskites, which have been shown to suffer from undesirable interaction with carbonaceous atmospheres and potential microstructural variations related to the kinetics of Ba‐transport, 12–19 while also highlighting that grain and grain boundary attack occur simultaneously.…”

“…Other authors attempted the formation of composite phases 15,16 . In this respect, Lacz et al 15 . evaluated the influence of barium phosphate on the chemical stability of BCY10.…”