Structure, chemical stability and electrical properties of BaCe 0.9 Y 0.1 O 3−δ proton conductors impregnated with Ba 3 (PO 4 ) 2

Łącz, Agnieszka; Silarska, Katarzyna; Piecha, Inga; Pasierb, P.

doi:10.1016/j.ijhydene.2016.06.009

Cited by 9 publications

(3 citation statements)

References 38 publications

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“…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][13][14][15][16][17][18][19] while also highlighting that grain and grain boundary attack occur simultaneously.…”

Section: Long-term Stability Tests In H 2 O and Co 2 Atmospheressupporting

confidence: 89%

“…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. The authors tested the stability in humidified air (7% CO 2 and 100% RH) at 25 • C for 700 h. The results demonstrated the formation of BaCO 3 or Ba(OH) 2 , albeit to a lesser extent for the composites.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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In this work, we demonstrate that the introduction of a small amount of NiO (1.8 wt%) to the proton-conducting perovskite yttrium-doped barium (BaCe 0.9 Y 0.1 O 3−δ , BCY10) can radically improve its chemical stability, even in conditions of very high carbon dioxide partial pressure (p O2 = 1 atm) and wet conditions (p H2O = 0.033 atm). To this end, we test sets of unmodified and NiOmodified BCY samples sintered at different temperatures to achieve different grain sizes. Long-term stability measurements up to 720 h at 400 • C, under these conditions, reveal a noticeable drop in conductivity for the unmodified samples, scaling with decreasing grain size, due to the formation of barium carbonate. Conversely, the NiO-modified samples show no apparent degradation, with a stable conductivity performance retained over 720 h, irrespective of grain sizes. We tentatively attribute this unusual behavior to the increased chemical resistance of the perovskite phase due to an increase in the a NiO /a BaO activity ratio at the bulk surfaces, which can prevent surface attack. Such an effect is supported by an observed increase in the Schottky barrier height, revealing a change in the specific grain boundary properties of the NiO-modified samples. Conductivity measurements in wet O 2 (p H2O = 0.033 atm) underscore that both the bulk and grain boundary terms of the conductivity of the NiO-modified sample, sintered at 1350 • C, are competitive with the unmodified BCY sample, sintered at 1450 • C, even at temperatures as low as 400 • C. The results here reported, thus, unlock a different perspective for these transition metal additives, to improve the chemical resistance of proton-conducting ceramics perovskites.

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Section: Long-term Stability Tests In H 2 O and Co 2 Atmospheressupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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“…In particular, doped BaCeO 3 materi-als have low chemical stability along with superior proton transport. [15][16][17] Conversely, while BaZrO 3 offers better chemical stability, overall protonic transport is impeded due to its considerable grain boundary resistance. [18][19][20][21] In order to combine the advantages of both phases, numerous research efforts have focused on a complex BaCeO 3 -BaZrO 3 system.…”

Section: Introductionmentioning

confidence: 99%

Enhanced transport properties of Sn‐substituted proton‐conducting BaZr_0.8Sc_0.2O_3–δ ceramic materials

et al. 2021

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High-temperature proton conductors based on acceptor-doped barium zirconate exhibit excellent chemical stability in atmospheres containing CO 2 or H 2 O. However, due to their refractory nature, these conductors have a low grain growth rate, which negatively affects the overall electrical conductivity. A possible strategy for increasing the ionic conductivity of zirconates lies in the partial substitution of Zr-ions with other isovalent dopants. In this work, we carried out systematic studies of the crystal structure, microstructure, hydration capacity, transport, and thermal properties of BaZr 0.8-x Sn x Sc 0.2 O 3-δ (x = 0, 0.1, and 0.2).According to X-ray powder diffraction and scanning electron microscopy data, all studied ceramic samples have a cubic perovskite structure, whose average grain size decreases with tin doping. It is found that the composition with x = 0.1 exhibits the highest values in terms of total, ionic, grain, and grain-boundary conductivities. The complex analysis of the obtained data shows that a low-level substitution of Zr 4+ -with Sn 4+ -ions is a competent approach for designing new proton-conducting electrolytes attractive for high-temperature applications.

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Fuel cells

Sørensen

Spazzafumo

2018

Hydrogen and Fuel Cells

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Structure, chemical stability and electrical properties of BaCe 0.9 Y 0.1 O 3−δ proton conductors impregnated with Ba 3 (PO 4 ) 2

Cited by 9 publications

References 38 publications

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

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

Enhanced transport properties of Sn‐substituted proton‐conducting BaZr_0.8Sc_0.2O_3–δ ceramic materials

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Structure, chemical stability and electrical properties of BaCe 0.9 Y 0.1 O 3−δ proton conductors impregnated with Ba 3 (PO 4 ) 2

Cited by 9 publications

References 38 publications

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

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

Enhanced transport properties of Sn‐substituted proton‐conducting BaZr0.8Sc0.2O3–δ ceramic materials

Fuel cells

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Enhanced transport properties of Sn‐substituted proton‐conducting BaZr_0.8Sc_0.2O_3–δ ceramic materials