Electrical properties and reducibilities of ceria-rare earth oxide systems and their application to solid oxide fuel cell

Yahiro, Hidenori; Eguchi, Koichi; Arai, Hiromichi

doi:10.1016/0167-2738(89)90061-1

Cited by 442 publications

(222 citation statements)

References 8 publications

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“…Doped ceria electrolytes such as Ce 1 − x Gd x O 2 − δ (GDC), Ce 1 − x Sm x O 2 − δ (SDC), and Ce 1 − x Y x O 2 − δ (YDC) show high ionic conductivity. Ceria-doped singly with Sm has been reported to exhibit the highest conductivity among the singly doped ceria materials [11,12]. But, Sm 2 O 3 is very costly.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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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“…Inaba and Tagawa 1 have summarized many papers concerning the ceria based solid electrolytes. Eguchi et al 2 ,3 reported that the oxide-ion conductivity of 20 atom!Sm-and Gd-doped ceria showed the highest conductivity because of the close ionic-radii of Sm 3 and Gd 3 to Ce 4 . In order to clarify the dynamic characteristics of oxide-ion conductors, several researchers have applied ac conductivity measurements to them.…”

Section: Introductionmentioning

confidence: 99%

Relationship between Oxide-Ion Conductivity and Dielectric Constant in Ce0.9Sm0.1O2-.DELTA.

博

早織

華子

et al. 2007

J. Ceram. Soc. Japan

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The relationship between electrical conductivity and dielectric constant was investigated for 10 atom!Sm doped CeO 2 Ce 0.9 Sm 0.1 O 2 d , which is a typical oxide-ion conductor. Computer simulation clarified that anomalously large dielectric constant originated from the superimposition of both Debye-type dipole and interfacial polarization between electrolyte and electrode. The interfacial polarization was proportional to the inverse of the frequency, suggesting the accumulation of oxide ions at the interfacial sites with high-energy barriers due to the oxide-ion conduction. Ac conductivity s ac at high temperatures and high frequencies agreed with the s dc value, but lowered in such a frequency region that the Debye-type polarization appeared. The activation energy for s dc agreed with those for Debye-type polarization and interfacial polarization, suggesting that these thermal exciting processes originate from oxide-ion diffusion.

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“…Eguch et al 2 ,3 reported that the oxide-ion conductivity of Sm-and Gd-doped ceria showed the highest conductivity among the 20 atom! doped cerias because of the close ionic-radii of Sm 3 and Gd 3 to the radius of Ce 4 . The oxide-ion conduction has a close relation with an electric dipole polarization of oxygen vacancy.…”

Section: Introductionmentioning

confidence: 99%

Dielectric Relaxations in the Ce1-xSmxO2-.DELTA. System

Yamamura

Takeda

Kakinuma

2007

J. Ceram. Soc. Japan

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Dielectric relaxations were investigated for the solid-solution system Ce 1 x Sm x O 2 d 0.0x0.5 , which is a typical oxide-ion conductor. The dielectric constants showed anomalously large values at low frequencies and high temperatures. Computer simulation clarified that the anomalously large dielectric constant e r ö originated from the superimposition of both Debye-type polarization and interfacial polarization between electrolyte and electrode. Two kinds of Debye-type relaxation observed were ascribed to defect associates, Sm Ce ö -VThe Debye-type polarization was also confirmed by analyzing the dielectric loss factor e r ÷ . When the oxide-ion conductivity decreased in the heavy Sm-doped samples, the Debye-type polarization also disappeared, suggesting that ordering of oxygen vacancy suppressed the electric field response of Debye-type polarization.

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Electrical properties and reducibilities of ceria-rare earth oxide systems and their application to solid oxide fuel cell

Cited by 442 publications

References 8 publications

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

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

Relationship between Oxide-Ion Conductivity and Dielectric Constant in Ce0.9Sm0.1O2-.DELTA.

Dielectric Relaxations in the Ce1-xSmxO2-.DELTA. System

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