Preparation and properties of rare earth co-doped Ce0.8Sm0.2−xYxO1.9 electrolyte materials for SOFC

Sha, Xueqing; Lü, Zhe; Huang, Xiao; Miao, Jipeng; Li, Jia; Xin, Xiaozhou; Su, Wenhui

doi:10.1016/j.jallcom.2005.12.061

Cited by 77 publications

(32 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The thermal expansion coefficient is an average value 13.99× 10 −6 K −1 , determined from the Fig. 5 in the temperature of 473-1,273 K. This is comparable with earlier reports (12.39×10 −6 K −1 ), measured by using dilatometer [33,34].…”

Section: Resultssupporting

confidence: 90%

Relaxation studies of bulk samarium doped ceria electrolyte

Bhosale

Joshi

Pawar

et al. 2010

Ionics

View full text Add to dashboard Cite

The nanocrystalline samarium doped ceria powder of phase Ce 0.8 Sm 0.2 O 1.9 was pelletized and sintered at about 1,623 K for the study of relaxation process. The impedance measurements were done within the frequencies from 1 Hz to 1 MHz for wide temperature range of 529-673 K. The temperature-dependent relaxation frequency found to be shifted towards higher frequency region from 17.26 to 707.96 KHz and the corresponding relaxation time for oxygen ions transport was varied from 9.22 to 0.22 μS. The temperature dependent conductivity and relaxation frequency revealed Arrhenius nature, showing activation energies 1.18 and 1.01 eV, respectively. This difference was attributed to pronounced interference due to the grain boundaries. The effect of sintering on microstructure of the sample was studied by using SEM and X-ray diffractometer (XRD). The structural and phase stability study was done by hightemperature (HT)-XRD. The thermal expansion coefficient of the samarium doped ceria powder determined from HT-XRD was found to be 13.9×10 −6 K −1 .

show abstract

Section: Resultssupporting

confidence: 90%

Relaxation studies of bulk samarium doped ceria electrolyte

Bhosale

Joshi

Pawar

et al. 2010

Ionics

View full text Add to dashboard Cite

show abstract

“…39 Gd and Sm doped ceria both show a larger O conductivity than Y doped ceria. 48,49 In Table III this conductivity order is also indicated by the experimental activation energies. Note that only values from the same reference can be safely compared.…”

Section: Resultsmentioning

confidence: 88%

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

Wang

Chroneos

Schwingenschlögl

2013

The Journal of Chemical Physics

View full text Add to dashboard Cite

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.

show abstract

“…Some co-doped ceria-based electrolytes have been investigated, such as (Ce ( Ce 1−x−y La x Sr y O 2−z [13], Ce 1−a Gd a−y Sm y O 2−0.5a [14], Ce 1−x−y Gd x Pr y O 2−z [15], Ce 0.85 Gd 0.1 Mg 0.05 O 1.9 [16], Sm x Gd 0.2−x Ce 0.8 O 1.9 [17], Ce 0.8 Sm 0.2−x Y x O 1.9 [18], Ce 0.9 Ca 0.1−x Sr x O 1.9 [19], etc., the results indicated that co-doping method was proved to be effective to improve the electrical property of the ceria-based electrolyte. In our previous work, the properties of the rare-earth co-doped Ce 0.8 Sm 0.2−x Y x O 1.9 (x = 0.0-0.20) electrolytes were studied [18]. The results displayed that the electrolyte, when x = 0.05 or 0.10, appeared higher conductivity and lower activation energy than the singly doped ceria with the same dopant concentration (20% trivalent rare earth) at the temperature range of 550-700 • C. It suggested that the Ce 0.…”

Section: Introductionmentioning

confidence: 99%