Electrical properties of ceria-based oxides and their application to solid oxide fuel cells

Eguchi, Koichi; Setoguchi, Taro; Inoue, Takanori; Arai, Hiromichi

doi:10.1016/0167-2738(92)90102-u

Cited by 877 publications

(520 citation statements)

References 10 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%

“…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%

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

et al. 2008

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“…Furthermore, Sm +3 is one of the best dopants for increasing ionic conductivity in ceria [44] and was observed to have a much larger effect on activity for n-butane oxidation [39], so that changes in the redox properties are expected to be much more significant. We considered Y +3 doping, which has less effect on the conductivity and catalytic activity than Sm +3 , to determine how general the results obtained with SDC are.…”

Section: Rare-earth Doped Ceriamentioning

confidence: 99%

Oxidation enthalpies for reduction of ceria surfaces

et al. 2007

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The thermodynamic properties of surface ceria were investigated through equilibrium isotherms determined by flow-titration and coulometric-titration measurements on high-surface-area ceria and ceria supported on La-modified alumina (LA). While the surface area of pure ceria was found to be unstable under redox conditions, the extent of reduction at 873 K and a P(O 2 ) of 1.6x10 -26 atm increased with surface area. Because ceria/LA samples were stable, equilibrium isotherms were determined between 873 and 973 K on a 30-wt% ceria sample. Oxidation enthalpies on ceria/LA were found to vary with the extent of reduction, ranging from -500 kJ/mol O 2 at low extents of reduction to near the bulk value of -760 kJ/mol O 2 at higher extents. To determine whether +3 dopants could affect the oxidation enthalpies for ceria, isotherms were measured for Sm +3 -doped ceria (SDC) and Y +3 -doped ceria. These dopants were found to remove the phase transition observed in pure ceria below 973 K but appeared to have minimal effect on the oxidation enthalpies. Implications of these results for catalytic applications of ceria are discussed. AbstractThe thermodynamic properties of surface ceria were investigated through equilibrium isotherms determined by flow-titration and coulometric-titration measurements on high-surfacearea ceria and ceria supported on La-modified alumina (LA). While the surface area of pure ceria was found to be unstable under redox conditions, the extent of reduction at 873 K and a P(O 2 ) of 1.6x10 -26 atm increased with surface area. Because ceria/LA samples were stable, equilibrium isotherms were determined between 873 and 973 K on a 30-wt% ceria sample. Oxidation enthalpies on ceria/LA were found to vary with the extent of reduction, ranging from -500 kJ/mol O 2 at low extents of reduction to near the bulk value of -760 kJ/mol O 2 at higher extents.To determine whether +3 dopants could affect the oxidation enthalpies for ceria, isotherms were measured for Sm +3 -doped ceria (SDC) and Y +3 -doped ceria. These dopants were found to remove the phase transition observed in pure ceria below 973 K but appeared to have minimal effect on the oxidation enthalpies. Implications of these results for catalytic applications of ceria are discussed.

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“…To do this, a better and thinner electrolyte is needed. One material meeting this demand is doped CeO 2 which has a higher ion conductivity than YSZ at low temperatures [5,6]. By downscaling the electrolyte to a thin film (< 5 μm), and therefore minimizing ohmic resistance, the structure and characteristics of the electrolyte are changed due to the occurrence of small scale or nano effects [7].…”

mentioning

confidence: 99%

Influence of oxygen flow and film thickness on the texture and microstructure of sputtered ceria thin films

Steenberge¹,

Leroy²,

Depla³

2014

Thin Solid Films

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Electrical properties of ceria-based oxides and their application to solid oxide fuel cells

Cited by 877 publications

References 10 publications

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

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

Oxidation enthalpies for reduction of ceria surfaces

Influence of oxygen flow and film thickness on the texture and microstructure of sputtered ceria thin films

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