Electronic conductivity measurement of Sm- and La-doped ceria ceramics by Hebb?Wagner method

Shimonosono, Taro; Hirata, Yoshihiro; Ehira, Yuka; Sameshima, Soichiro; Horita, Teruhisa; Yokokawa, Harumi

doi:10.1016/j.ssi.2004.07.025

Cited by 90 publications

(56 citation statements)

References 13 publications

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“…e r (b ) ) (9) Christe and Berkal reported 12) the linear relation between C g and d b (L i (b )/n) as predicted by Eq. (8) and the assumed the relation of e r (b )e r (g ) to estimate L i (g).…”

Section: Thickness Of Grain Boundary and Surface Layermentioning

confidence: 87%

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Grain size dependence of electrical properties of Gd-doped ceria

Hara

Hirata

Sameshima

et al. 2008

J. Ceram. Soc. Japan

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A Gd-doped ceria powder (GDC, Ce 0.8 Gd 0.2 O 1.9 ) prepared from an oxalate precursor was hot-pressed at 1173-1273 K in Ar atmosphere and annealed in air at 1273-1473 K to control the bulk density and grain size. Complex impedance of GDC of the microstructures of 0.29-5.6 mm average grain size and 95-98 theoretical density were measured at 573-1073 K in air in the frequency range from 100 Hz to 2 MHz. The bulk conductivity (s i (b)) was independent of the grain size and the activation energy for the migration of oxide ions was 85-88 kJ/mol. The grain boundary conductivity (s i (g)) was far small as compare with s i (b) (s i (g)＝1/40-1/700 of s i (b) at 573 K). The s i (g) was influenced by the average grain size and showed a minimum value at around 3 mm and gradually increased with decreasing grain size. However, the total conductivity decreased for smaller grain size because of the increased thickness of grain boundary of relatively low conductivity. The information of diffusion of oxide ions from the surface into GDC inside was also reported.

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Section: Thickness Of Grain Boundary and Surface Layermentioning

confidence: 87%

“…(9). Figure 10 shows the Arrhenius plots of s i (bulk) and s i (grain boundary) by substituting the determined thickness of grain boundary for Eq.…”

mentioning

confidence: 99%

Grain size dependence of electrical properties of Gd-doped ceria

Hara

Hirata

Sameshima

et al. 2008

J. Ceram. Soc. Japan

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“…Extensive research efforts in our group have been devoted to solving this problem by means of adding Ce 0.8 Sm 0.2 O 2-d (SDC) electrolyte to the LSCF to form a composite cathode design [11]. Unfortunately, lowering the TEC is usually coupled with a remarkable decrease in the electrical conducting properties due to the lower electronic conductivity of the SDC composition (10 -2 -1.0 S cm -1 ) in this composite design [12]. Oxygen hyperstoichiometric La 2 NiO 4+d (LNO) based compounds (A 2 BO 4+d ) with a K 2 NiF 4 structure have attracted growing attention as a novel mixed conductor [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Characterization of La_0.6Sr_0.4Co_0.2Fe_0.8O_3–δ + La₂NiO_4+δ Composite Cathode Materials for Solid Oxide Fuel Cells

et al. 2012

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The structure, electrical conduction, thermal expansion and electrochemical properties of the La0.6Sr0.4Co0.2Fe0.8O3–δ + La2NiO4+δ (LSCF‐LNO) composite cathodes were investigated with regard to the volume fraction of the LNO composition. No chemical reaction product between the two constituent phases was found for the composite cathodes sintered at 1,400 °C for 10 h within the sensitivity of the XRD. Compared to the performance of the LSCF cathode, the LNO composition in the composite cathode plays a role in deteriorating both electrical conductivity and electrochemical properties, however, improving the thermal expansion properties. The trade‐off between electrical conducting and thermal expansion classifies the composite cathode containing 30 volume percent (vol.%) LNO as the optimum composition. For characterizing cathode performance in a single cell, a slurry spin coating technique was employed to prepare a porous cathode layer as well as a YSZ/Ce0.8Sm0.2O3–δ (SDC) electrolyte. The optimum conditions for fabricating the YSZ/SDC electrolyte were investigated. The resulting single cell with 70 vol.% LSCF‐30 vol.%LNO (LSCF‐LNO30) cathode shows a power density of 497 mW cm–2 at 800 °C, which is lower than that of the cell with a LSCF cathode, but still within the limits acceptable for practical applications.

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“…In contrast to the conductivity of oxide ion solid electrolyte, such as ceria-doped samarium (SDC), MCZY (M=barium, strontium) and SDC are in the same magnitude [21]. The result indicates that SCZY and BCZY are potential electrolyte even in mid-temperature.…”

Section: Conductivitymentioning

confidence: 94%

H2S Solid oxide fuel cell based on a modified Barium cerate perovskite proton conductor

Winie

Zhong

Miao

et al. 2008

Ionics

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Urea combustion method was adopted to prepare precursor powder, MCeO 3 doped with Zr (M is alkaline earth element, such as barium, strontium, and calcium). The precursor powder has typically perovskite structure after being calcined at 873 K. In 773 K∼1,273 K, BaCe 0.425 Zr 0.475 Y 0.1 O 3 has the highest conductivity above 10 −2 S cm −1 and good chemical stability, while the phase transition may exist in H 2 S atmosphere for the proton conductors. In the single fuel cell composed of MoS 2 -BaCe 0.425 Zr 0.475 Y 0.1 O 3-σ -Ag with BaCe 0.425 Zr 0.475 Y 0.1 O 3-σ as electrolyte, the best performance is obtained. The open circuit voltage of fuel cell is all about 0.72 V, the max power density, 1.55 mW cm −2 . The performance drop is attributed to ohmic loss resulting from the separation of electrolyte and electrode, and improvement is required to bring out new anode materials compatible to the proton conductor, BaCe 0.425 Z r 0.475 Y 0.1 O 3-σ , as electrolyte.

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Electronic conductivity measurement of Sm- and La-doped ceria ceramics by Hebb?Wagner method

Cited by 90 publications

References 13 publications

Grain size dependence of electrical properties of Gd-doped ceria

Grain size dependence of electrical properties of Gd-doped ceria

Characterization of La_0.6Sr_0.4Co_0.2Fe_0.8O_3–δ + La₂NiO_4+δ Composite Cathode Materials for Solid Oxide Fuel Cells

H2S Solid oxide fuel cell based on a modified Barium cerate perovskite proton conductor

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Electronic conductivity measurement of Sm- and La-doped ceria ceramics by Hebb?Wagner method

Cited by 90 publications

References 13 publications

Grain size dependence of electrical properties of Gd-doped ceria

Grain size dependence of electrical properties of Gd-doped ceria

Characterization of La0.6Sr0.4Co0.2Fe0.8O3–δ + La2NiO4+δ Composite Cathode Materials for Solid Oxide Fuel Cells

H2S Solid oxide fuel cell based on a modified Barium cerate perovskite proton conductor

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Product

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Characterization of La_0.6Sr_0.4Co_0.2Fe_0.8O_3–δ + La₂NiO_4+δ Composite Cathode Materials for Solid Oxide Fuel Cells