Study on La and Y co-doped ceria-based electrolyte materials

Sha, Xueqing; Lü, Zhe; Huang, Xiqiang; Miao, Jipeng; Ding, Zhanhui; Xin, Xiaozhou; Su, Wenhui

doi:10.1016/j.jallcom.2006.03.077

Cited by 90 publications

(38 citation statements)

References 21 publications

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“…XRD and combined SE�/EDS analysis showed clearly a strong interaction between phases, with La diffusion to CGO and loss of Gd to the silicate phase. This observation together with a good electrical performance of these samples is coherent with the reported optimized transport properties of fluorite based electrolytes containing more than one dopant [15][16][17].…”

Section: Silica-scavenging Effects In Ceria-based Solid Electrolytessupporting

confidence: 87%

Efecto de eliminación de sílice en electrolitos sólidos basados en óxido de cerio

Ivanova¹,

Kovalevsky²,

Хартон³

et al. 2008

Bol. Soc. Esp. Ceram. Vidr.

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Composite materials based on gadolinium doped ceria (CGO) with additions of silica, with both silica and lanthanum oxide, and with lanthanum silicate, were prepared by the conventional ceramic route, to assess the silica scavenging role of lanthanum oxide additions. Structural, microstructural and electrical characterization of these samples confirmed the formation of one apatite type lanthanum silicate-based phase from reaction of silica with lanthanum oxide. The formation of this phase occurred in parallel with a significant enhancement of the grain boundary conductivity of these composite materials. Further interaction between constituents, involving diffusion of La to CGO, and Ce and Gd to the apatite phase, had no significant consequences on the electrical performance of these materials. Overall, lanthanum oxide was shown to remove the siliceous phases from the grain boundaries of CGO. Keywords: ceria, scavenging effect, silica, grain boundary Efecto de eliminación de sílice en electrolitos sólidos basados en óxido de cerio.Se prepararon materiales compuestos basados en óxido de cerio dopado con gadolinio (TGO) con adicciones de sílice, con sílice y óxido de lantano y silicato del lantano, mediante procesamiento cerámico convencional con objeto de confirmar el papel secuestrante de sílice de las adicciones. La caracterización estructural, microestructural y eléctrica de las muestras confirmó la formación de una fase tipo apatito basada en silicato de lantano a partir de la reacción de la sílice con el óxido de lantano. La formación de esta fase ocurre en paralelo con un incremento significativo de la conductividad a través del borde de grano de estos materiales. La interacción entre los constituyentes, incluyendo la difusión del La al CGO, y el Ce y el Gd a la fase apatito, no tiene consecuencias significativas sobre el comportamiento eléctrico de estos materiales. Resumiendo, el óxido de lantano es capaz de eliminar las fases silicias del borde de grano del CGO.

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Section: Silica-scavenging Effects In Ceria-based Solid Electrolytessupporting

confidence: 87%

Efecto de eliminación de sílice en electrolitos sólidos basados en óxido de cerio

Ivanova¹,

Kovalevsky²,

Хартон³

et al. 2008

Bol. Soc. Esp. Ceram. Vidr.

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“…Experiments for Ce 0.2 M 0.8 O 2−δ demonstrate that under the same experimental conditions La doping yields a worse conductivity than Y doping 37 and that Sm doping is less favorable than Gd doping. 39 Gd and Sm doped ceria both show a larger O conductivity than Y doped ceria.…”

Section: Resultsmentioning

confidence: 86%

“…[30][31][32][33] In this study, we therefore choose U = 5 eV and J = 0 eV. 34 Spin polarized calculations are performed to be consistent with experimental findings 35,36 and experimental lattice constants of 5.413 Å, 5.423 Å, 5.431 Å, 5.422 Å, 5.476 Å, and 5.411 Å are taken from Y, 37 Gd, 38 Sm, 39 Pr, 40 and La 38 doped CeO 2 and pure CeO 2 , 25 respectively. All structures are fully optimized until the atomic forces are smaller than 0.01 eV/Å.…”

Section: Methodsmentioning

confidence: 99%

Impact of doping on the ionic conductivity of ceria: A comprehensive model

Wang

Chroneos

Schwingenschlögl

2013

The Journal of Chemical Physics

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Doped ceria is considered as an electrolyte for solid oxide fuel cell applications. The introduction of dopants in the ceria lattice will affect its electronic structure and, in turn, its ionic conductivity. Simulation of these issues using density functional theory becomes complicated by the random distribution of the constituent atoms. Here we use the generalized gradient approximation with on-site Coulomb interaction in conjunction with the special quasirandom structures method to investigate 18.75% and 25% Y, Gd, Sm, Pr, and La doped ceria. The calculated lattice constants and O migration energies allow us to explain the behavior of the conductivity as obtained in experiments.

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“…Composition with x=0.025 exhibits the highest conductivity among all the compositions. Its conductivity at 600°C is higher than the highest values of conductivity reported for the compositions Ce 0.8 La 0.14 Y 0.06 O 1.9 (6.1×10 −3 S/cm) [39] Ce 0.8 Sm 0.2 O 1.9 (SDC) (1.20×10 −2 S/ cm) [40], and Ce 0.8 Gd 0.2 O 1.9 (GDC) (1.29×10 −2 S/cm) [41] at 600°C. This may make it a potential candidate as a solid electrolyte for IT-SOFCs.…”

Section: −V Omentioning

confidence: 56%

Preparation and characterization of Ce0.85La0.15 − xSrxO{2 − (0.075 + x / 2)} solid electrolytes for intermediate temperature solid oxide fuel cells

Jaiswal

Kumar

Upadhyay

2014

Ionics

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A few compositions in the system Ce 0.85 La 0.15 − x Sr x O {2 − (0.075 + x / 2)} have been prepared using citrate-nitrate method. More than 95 % of theoretical density has been obtained by sintering at 1,350°C for 4 h in air. Solid solution forms in all the compositions. Surface morphology has been studied by scanning electron microscope (SEM). Morphology of powder has been studied by bright field transmission electron microscopy (BFTEM). Complex plane impedance measurements have been made in the frequency range 1 Hz-1 MHz between 200 and 600°C to separate the contributions of grains, grain boundaries, and electrode-specimen interface polarizations. Composition, Ce 0.85 La 0.125 Sr 0.025 O 1.9125 , exhibits the maximum conductivity 1.50×10 −2 S/cm at 600°C which is much higher than that of ceria doped with La only in the intermediate temperature range. Co-doping with Sr increases the bulk as well as grain boundary conductivity.

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Study on La and Y co-doped ceria-based electrolyte materials

Cited by 90 publications

References 21 publications

Efecto de eliminación de sílice en electrolitos sólidos basados en óxido de cerio

Efecto de eliminación de sílice en electrolitos sólidos basados en óxido de cerio

Impact of doping on the ionic conductivity of ceria: A comprehensive model

Preparation and characterization of Ce0.85La0.15 − xSrxO{2 − (0.075 + x / 2)} solid electrolytes for intermediate temperature solid oxide fuel cells

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