Cr Poisoning Suppression in Solid Oxide Fuel Cells Using LaNi(Fe)O[sub 3] Electrodes

Komatsu, Takeshi; Arai, Hajime; Chiba, Reiichi; Nozawa, Kazuki; Arakawa, Masayasu; Sato, Kazunori

doi:10.1149/1.2130309

Cited by 111 publications

(83 citation statements)

References 10 publications

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“…Thus it appears to be worthwhile to investigate alkaline earth-free cathode materials with regard to their resistance to Cr-and Si-poisoning. A positive example of this approach is LaNi 0.6 Fe 0.4 O 3 , which has been proposed in the literature as a SOFC-cathode material with high Cr-tolerance [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Long-term stability of the IT-SOFC cathode materials La0.6Sr0.4CoO3−δ and La2NiO4+δ against combined chromium and silicon poisoning

et al. 2015

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Long-term degradation effects of combined Cr-and Si-poisoning on the promising IT-SOFC cathode materials La 0.6 Sr 0.4 CoO 3-δ and La 2 NiO 4+δ were investigated at 700°C in dry and humid atmospheres for subsequent periods of 1000 hours using dcconductivity relaxation measurements. Degradation-induced changes in chemical composition and morphology of the contaminated sample surfaces were studied by atomic force microscopy, X-ray photoelectron spectroscopy and scanning electron microscopy with energy and wavelength dispersive X-ray analysis. Upon exposure to humid, Cr-and Si-containing gas flows both materials exhibit a strong decrease of the chemical surface exchange coefficient of oxygen by a factor 110 and 40 for La 0.6 Sr 0.4 CoO 3-δ and La 2 NiO 4+δ , respectively, which can be attributed to the formation of Cr-containing crystallites on the degraded sample surfaces. Post-test analyses confirm large amounts of Cr accompanied by a Sr-enrichment within the first 600 nm of the surface of La 0.6 Sr 0.4 CoO 3-δ , indicating the decomposition of the perovskite phase by SrCrO 4 -formation. For La 2 NiO 4+δ the penetration depth of chromium is significantly less and Cr-traces up to a depth of up to 140 nm were determined by depth profiling. For both compounds silicon was found to spread in small patches across the entire sample surface as determined by elemental mapping analysis.

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Section: Introductionmentioning

confidence: 99%

Long-term stability of the IT-SOFC cathode materials La0.6Sr0.4CoO3−δ and La2NiO4+δ against combined chromium and silicon poisoning

et al. 2015

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“…Recently it has been proposed that Cr-poisoning can be suppressed by using Cr-resistant cathodes [11,[14][15][16]. However, the actual Cr-tolerance of the proposed cathode materials is debatable and controversial [17].…”

Section: Prefacementioning

confidence: 99%

“…The nucleation agents inducing Cr deposition discovered so far include: Mn 2+ and SrO [12,13,15]. The search for Crtolerant materials was first reported on La(Ni,Fe)O 3 cathode material [11,14,15]. A particular composition of LaNi 0.6 Fe 0.4 O 3 (LNF), prepared intentionally without nucleating elements such as Mn, and/or Sr, showed no Cr deposition [14].…”

Section: New Promising Cr-tolerant Cathodementioning

confidence: 99%

“…The search for Crtolerant materials was first reported on La(Ni,Fe)O 3 cathode material [11,14,15]. A particular composition of LaNi 0.6 Fe 0.4 O 3 (LNF), prepared intentionally without nucleating elements such as Mn, and/or Sr, showed no Cr deposition [14]. The authors concluded that LNF is stable against Cr vapors at 800…”

Section: New Promising Cr-tolerant Cathodementioning

confidence: 99%

“…• C [14]. No visible Cr deposition was found on the LNF electrode surface or at the LNF/YSZ interface [11].…”

Section: New Promising Cr-tolerant Cathodementioning

confidence: 99%

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