Ceria-based solid electrolytes

Inaba, Hideaki; Tagawa, Hiroaki

doi:10.1016/0167-2738(95)00229-4

Cited by 1,517 publications

(969 citation statements)

References 29 publications

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“…In all these Ln-doped ceria samples, the electrical conduction is predominantly ionic in air at intermediate temperature ͑around 500°C͒. [2][3][4] As the doping concentration increases from 15 to 25 at. %, a dramatic decrease in the conductivity was observed, as listed in Table I.…”

Section: Resultsmentioning

confidence: 99%

“…[1][2][3][4] Many studies have demonstrated that the electrical properties of doped ceria can be significantly influenced by the dopant type. [2][3][4] There exists an optimum radius of the dopant for ionic conduction. As the dopant radius deviates from this optimum value, the ionic conductivity of doped ceria decreases dramatically.…”

Section: Introductionmentioning

confidence: 99%

“…This phenomenon has been attributed to the dopant-oxygen vacancy association that depends on the dopant radius. 2,[5][6][7] In the dilute doping range, the ionic conduction is dominated by this association and exhibits a maximum conductivity for ceria doped with Sm or Gd because these dopant cations have the optimum radius, and thereby have a smaller association enthalpy. [2][3][4] However, in heavily doped ceria, nanosized domains can form and give negative impacts on the ionic conduction.…”

Section: Introductionmentioning

confidence: 99%

“…2,[5][6][7] In the dilute doping range, the ionic conduction is dominated by this association and exhibits a maximum conductivity for ceria doped with Sm or Gd because these dopant cations have the optimum radius, and thereby have a smaller association enthalpy. [2][3][4] However, in heavily doped ceria, nanosized domains can form and give negative impacts on the ionic conduction. [8][9][10][11] These domains have higher dopant concentrations than the matrix and could provide deep traps for the oxygen vacancies.…”

Section: Introductionmentioning

confidence: 99%

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Oxygen-vacancy ordering in lanthanide-doped ceria: Dopant-type dependence and structure model

et al. 2008

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Studies of electron energy loss spectroscopy and selected area electron diffraction ͑SAED͒ were systematically performed on 15 and 25 at. % lanthanide ͑Ln͒-doped ceria samples ͑Ln= Sm, Gd, Dy, and Yb͒, through which the local ordering of oxygen vacancies that develops with increase in doping level was confirmed in the sequence of ͑Gd, Sm͒ Ͼ DyϾ Yb. Furthermore, a monotone correlation between the development of the ordering and the degradation of ionic conductivity with increasing the doping concentration from 15 to 25 at. % was observed. Based on the analysis of SAED patterns, a structural model for the ordering of oxygen vacancies has been constructed, in which the arrangement of oxygen vacancies is similar to that in C-type Ln 2 O 3 oxides and the 1 2 ͗110͘ pairs of the vacancies are preferred. Then, the factors that can influence the formation of the ordering are discussed.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Oxygen-vacancy ordering in lanthanide-doped ceria: Dopant-type dependence and structure model

et al. 2008

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“…Electrolytes used for fuel cells are usually the main components for determining the performance of the cell. Ceria doped with aliovalent cations, such as rare earth oxides, has been considered as one of the most promising candidate electrolyte materials for intermediate temperature solid oxide fuel cells (ITSOFCs) [6,7]. These materials show much higher ionic conductivity at relatively lower temperatures than the traditional electrolyte yttria-stabilized zirconia (YSZ).…”

Section: Introductionmentioning

confidence: 99%

Study on Sm³⁺ and Er³⁺ Co-Doped CeO₂-Based Electrolytes

Arabacı

2017

Acta Phys. Pol. A

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Ceria doped with aliovalent cations, such as rare earth oxides, has been considered as one of the most promising candidate electrolyte materials for intermediate temperature solid oxide fuel cells. In this study, high purity cerium nitrate, samarium nitrate and erbium nitrate salts were used to obtain ceria-based solid solutions Ce0.80Sm0.20O1.90 (SDC), Ce0.80Sm0.15Er0.05O1.90 (ESDC5), Ce0.80Sm0.10Er0.10O1.90 (ESDC10) through the cellulose templating method. Crystal structure and microstructure were characterized by means of X-ray diffraction and scanning electron microscopy, respectively. X-ray diffraction results indicate that a single-phase fluorite structure formed at a relatively low calcination temperature, 500 • C. The relative densities of the sintered pellets were higher than 93%. The electrical properties of doped and co-doped ceria electrolytes in the temperature range 300-750 • C were analyzed by using electrochemical impedance spectroscopy. The singly doped ceria at 750 • C showed the highest ionic conductivity with less activation energy.

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