Investigation of compatible anode systems for LaNbO4-based electrolyte in novel proton conducting solid oxide fuel cells

Magrasó, Anna; Fontaine, Marie‐Laure

doi:10.1016/j.jpowsour.2011.07.089

Cited by 14 publications

(7 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The tolerance for cation nonstoichiometry in LaNbO 4 materials is low, and the two minority phases studied here have been reported to possess a higher solubility of CaO or SrO than LaNbO 4 . It is therefore interesting to note the accumulation of calcium in La 3 NbO 7 and LaNb 3 O 9 .…”

Section: Discussionmentioning

confidence: 71%

“…The tolerance for cation nonstoichiometry in LaNbO 4 materials is low, 8 and the two minority phases studied here have been reported to possess a higher solubility of CaO or SrO than LaNbO 4 . [38][39][40] It is therefore interesting to note the accumulation of calcium in La 3 NbO 7 and LaNb 3 O 9 . Accumulation of calcium in the minority phases could have an effect on the proton conductivity of the materials, as undoped LaNbO 4 is reported to have a proton conductivity at least one order of magnitude lower than Ca-doped LaNbO 4 .…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Spark Plasma Sintering and Hot Pressing of Hetero‐Doped LaNbO₄

et al. 2012

View full text Add to dashboard Cite

LaNbO4/La3NbO7 and LaNbO4/LaNb3O9 cer‐cer composites were prepared by impregnating Ca‐doped LaNbO4 powder, synthesized by spray pyrolysis, with La‐ or Nb‐precursor solutions. The sintering of the calcined powders was investigated by dilatometry, and dense composites were prepared by conventional sintering, hot pressing, and spark plasma sintering. The particle size of the starting powders was about 50 nm, and the average grain size of the dense materials ranged from 100 nm and upwards, depending on the sintering temperature, sintering procedure, and the phase composition. The unit cell parameters of LaNbO4 showed a finite size effect and approached the cell parameters of tetragonal LaNbO4 with decreasing crystallite size, both for the single‐phase material and the composites. The minority phase (La3NbO7 or LaNb3O9) were observed as isolated grains and accumulated at triple points and not along the grain boundaries, pointing to a large dihedral angle between the phases. The calcium‐solubility in the minority phases was larger than in LaNbO4, which corresponds well with previous reports. The electrical conductivity of the hetero‐doped materials was similar to, or lower than, that for Ca‐doped LaNbO4.

show abstract

Section: Discussionmentioning

confidence: 71%

Section: Discussionmentioning

confidence: 99%

Spark Plasma Sintering and Hot Pressing of Hetero‐Doped LaNbO₄

et al. 2012

View full text Add to dashboard Cite

show abstract

“…Products during this reaction comprised NiNb 2 O 6 or Ni 4 Nb 2 O 9 depending on temperature [27]. While the Nb rich LaNb 3 O 9 was detrimental for the fuel cell anode and deprived LaNbO 4 of Ca, the La rich La 3 NbO 7 did not seem to have such adverse effects.…”

Section: Synthesis and Fabrication Of Ca-doped Lanbo4mentioning

confidence: 98%

“…Secondly, LaNb 3 O 9 reacted with NiO in anode components [27], severely destroying any anode during co-firing, seemingly aided by liquid phase transport. Products during this reaction comprised NiNb 2 O 6 or Ni 4 Nb 2 O 9 depending on temperature [27].…”

Section: Synthesis and Fabrication Of Ca-doped Lanbo4mentioning

confidence: 99%

“…While the Nb rich LaNb 3 O 9 was detrimental for the fuel cell anode and deprived LaNbO 4 of Ca, the La rich La 3 NbO 7 did not seem to have such adverse effects. It does react with NiO to form the perovskite LaNi 2/3 Nb 1/3 O 3 [27][28], but this has little impact in small amounts. In order to counteract occasional deficiencies of La and/or Ca, the powders were thereafter produced with deliberate excesses of both La and Ca in the range of a percent above nominal.…”

Section: Synthesis and Fabrication Of Ca-doped Lanbo4mentioning

confidence: 99%

See 1 more Smart Citation