Structural, morphological and electrical properties of Gd0.1Ce0.9O1.95 prepared by a citrate complexation method

Fuentes, Rodolfo O.; Baker, Richard T.

doi:10.1016/j.jpowsour.2008.09.119

Cited by 96 publications

(66 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Ce 0.8 Gd 0.2 O 1.9 (GDC) nanosized powders were synthesized using the citrate complexion method [30]. Then, electrolyte substrates were prepared by die pressing the as-synthesized GDC powder, followed by sintering at 1450 C for 20 h in air.…”

Section: Methodsmentioning

confidence: 99%

One dimensional La0.8Sr0.2Co0.2Fe0.8O3−δ/Ce0.8Gd0.2O1.9 nanocomposite cathodes for intermediate temperature solid oxide fuel cells

Zhao

Jia

Zhao

et al. 2012

Journal of Power Sources

View full text Add to dashboard Cite

Section: Methodsmentioning

confidence: 99%

One dimensional La0.8Sr0.2Co0.2Fe0.8O3−δ/Ce0.8Gd0.2O1.9 nanocomposite cathodes for intermediate temperature solid oxide fuel cells

Zhao

Jia

Zhao

et al. 2012

Journal of Power Sources

View full text Add to dashboard Cite

“…These events can be related to the burn out of organic materials, by liberation of NO x , CO, CO 2 , and to the crystallization of the CeNi20 solid solution, as observed for other ceria-based powders prepared by the same route. [23][24][25] Above 350 °C the material is stable, without any further thermal or weight changes up to 800 °C. In Figure 2a, SR-XRD patterns recorded in air with their Rietveld refinement are exhibited for the obtained CeO 2 and Ni-doped ceria oxides.…”

Section: Thermal Behavior and Room Temperature Structural Characterizmentioning

confidence: 99%

Structural, physical and chemical properties of nanostructured nickel-substituted ceria oxides under reducing and oxidizing conditions

et al. 2016

View full text Add to dashboard Cite

This work reports the synthesis of nanostructured Ce1-xNixO2-δ (x = 0.05, 0.1, 0.15 and 0.2) oxides prepared by cation complexation route and with the main objective of studying their redox properties using a combination of electron microscopy, synchrotron radiation X-ray diffraction (SR-XRD) and X-ray absorption near-edge spectroscopy (XANES). The Ce1-xNixO2-δ series of nanopowders maintain the cubic crystal structure (Fm3m space group) of pure ceria, with an average crystallite size of 5-7 nm indicated by XRD patterns and confirmed by transmission electron microscopy. In situ SR-XRD and XANES carried out under reducing (5% H2/He; 5% CO/He) and oxidizing (21%O2/N2) atmospheres at temperatures up to 500 °C show a Ni solubility limit close to 15 at.% in air at room temperature, decreasing to about 10 at.% after exposure to 5% H2/He atmosphere at 500 °C. At room temperature in air, the effect of Ni on the lattice parameter of Ce1-xNixO2-δ is negligible, whereas a marked expansion of the lattice is observed at 500 °C in reducing conditions. This is shown by XANES to be correlated with the reduction of up to 25% of Ce 4+ cations to the much larger Ce , possibly accompanied by the formation of oxygen vacancies. The redox ability of the Ce 4+ /Ce 3+ couple in nanocrystalline Ni-doped ceria is greatly enhanced in comparison to pure ceria or achieved by using other dopants (e.g. Gd, Tb or Pr), where it is limited to less than 5% of Ce cations.

show abstract

“…For the conduction of rare earth (Dy 3+ ) doped ceria, the total activation energy is the sum of the migration enthalpy ( H m ) of oxygen ions and the association enthalpy ( H a ) of the complex defects (e.g., Sm Ce V O /Dy Ce V O ) [23]. The change observed at around 600 • C can be explained by changes in the behaviors of the defects in the Ce 0.8 Sm 0.2−x Dy x O 2−ı materials [4,24,25]. In the low temperature range (300-600 • C), the oxygen vacancy associated with dopant is trapped as a result of the association of defects to form (Sm Ce V O /Dy Ce V O ) complexes, so both H m and H a influence the conductivity mechanism.…”

Section: Electrical Propertiesmentioning

confidence: 99%

Effect of Dy on the properties of Sm-doped ceria electrolyte for IT-SOFCs

Zheng

Zhou

et al. 2011

Journal of Alloys and Compounds

View full text Add to dashboard Cite

a b s t r a c tCo-doped ceria-based electrolytes of Ce 0.8 Sm 0.2−x Dy x O 2−ı (x = 0, 0.02, 0.06, 0.10, 0.14) were sintered from powders obtained by solid state reaction method. The phase identification, thermal expansion, ionic conductivities and microstructures of samples were studied by X-ray diffraction (XRD), dilatometry, AC impedance spectroscopy (IS) and scanning electron microscopy (SEM). The results showed that the addition of Dy led to higher ionic conductivity and lower activation energy in comparison with Sm singly doped ceria Ce 0.8 Sm 0.2 O 2−ı (SDC) in the temperature range of 300-800 • C. As the addition amount of Dy increased up to 2 mol% (Ce 0.8 Sm 0.18 Dy 0.02 O 2−ı ), the sample attained the highest ionic conductivity, about 50% higher than that of SDC at 500 • C. The effect of Dy on the grain boundary conductivity was more apparent than that of the bulk conductivity. XRD measurements indicated that all the samples were single phase. The thermal expansion was linear for all the samples. The addition of Dy did not change the thermal expansion coefficient (TEC) significantly.

show abstract

Structural, morphological and electrical properties of Gd0.1Ce0.9O1.95 prepared by a citrate complexation method

Cited by 96 publications

References 17 publications

One dimensional La0.8Sr0.2Co0.2Fe0.8O3−δ/Ce0.8Gd0.2O1.9 nanocomposite cathodes for intermediate temperature solid oxide fuel cells

One dimensional La0.8Sr0.2Co0.2Fe0.8O3−δ/Ce0.8Gd0.2O1.9 nanocomposite cathodes for intermediate temperature solid oxide fuel cells

Structural, physical and chemical properties of nanostructured nickel-substituted ceria oxides under reducing and oxidizing conditions

Effect of Dy on the properties of Sm-doped ceria electrolyte for IT-SOFCs

Contact Info

Product

Resources

About