High temperature pH sensing and O2− conduction properties of electrophoretically fabricated ceria composites

Hamagami, Jun‐ichi; Inda, Yasushi; Umegaki, Takao; Yamashita, Kimihiro

doi:10.1016/s0167-2738(98)00287-2

Cited by 7 publications

(5 citation statements)

References 8 publications

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“…In fact, because CO 3 2Ϫ has two negative charges and will produce greater crystal lattice energy than NO 3 Ϫ , we think that a Ce 4ϩ complex with CO 3 2Ϫ is more stable than a Ce 4ϩ complex with NO 3…”

Section: (1) Formation Of Ceo 2 Crystallites Synthesized Under Hydrotmentioning

confidence: 98%

“…When the Ce(SO 4 ) 2 solution was added to the NaOH solution, precipitates (gel) were formed immediately. After being filtered and washed by distilled water, the precipitates (gel) as a precursor were put into an autoclave with a reaction chamber of 40 cm 3 . Three quarters of the volume of the chamber was filled with solutions.…”

Section: (1) Hydrothermal Synthesis Of Ceo 2 Powdersmentioning

confidence: 99%

“…When the hydrothermal medium was adjusted to neutrality, the equilibria of reactions (24) and (25) shifted toward the right because the concentration of the hydroxide ion was decreased, and the concentration of CeOH 3ϩ , HCO 3 Ϫ , and HSO 4 Ϫ were increased. Therefore, the CO 2 and SO 3 contents of the powder obtained in neutral hydrothermal medium were lower.…”

Section: (1) Formation Of Ceo 2 Crystallites Synthesized Under Hydrotmentioning

confidence: 99%

“…C ERIA (CeO 2 ) is currently being used not only as an oxygen ion conductor in solid oxide fuel cells (SOFCs) 1,2 and oxygen monitors 3 but also as catalytic supports 4 -6 of automotive exhaust systems because of its high oxygen ion conductivity. It has been considered that the properties of the materials may be greatly improved if ultrafine powders are used as a raw material.…”

Section: Introductionmentioning

confidence: 99%

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Effect of pH of Medium on Hydrothermal Synthesis of Nanocrystalline Cerium(IV) Oxide Powders

Shi

Zheng

et al. 2002

Journal of the American Ceramic Society

142

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Well‐crystallized cerium(IV) oxide (CeO2) powders with nanosizes without agglomeration have been synthesized by a hydrothermal method in an acidic medium by using cerium hydroxide gel as a precursor. The relationship between the grain size, the morphology of the CeO2 crystallites, and the reaction conditions such as temperature, time, and acidity of the medium was studied. The experiments showed that with increasing reaction temperature and time, the CeO2 crystallites grew larger. The crystallites synthesized in an acidic hydrothermal medium were larger and had a more regular morphology than the ones synthesized in a neutral or alkaline medium when the reaction temperature and time were fixed. The CeO2 crystallites synthesized in an acidic medium were monodispersed; however, there was vigorous agglomeration among the grains synthesized in a neutral or alkaline medium. It was demonstrated that the hydrothermal treatment was an Ostwald ripening process and the acidity (pH) of the used hydrothermal medium played a key role in the dissolution of smaller grains. It is proposed that the dissolution process can control the kinetics of the growth of larger grains.

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Section: (1) Formation Of Ceo 2 Crystallites Synthesized Under Hydrotmentioning

confidence: 98%

Section: (1) Hydrothermal Synthesis Of Ceo 2 Powdersmentioning

confidence: 99%

Section: (1) Formation Of Ceo 2 Crystallites Synthesized Under Hydrotmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of pH of Medium on Hydrothermal Synthesis of Nanocrystalline Cerium(IV) Oxide Powders

Shi

Zheng

et al. 2002

Journal of the American Ceramic Society

142

View full text Add to dashboard Cite

show abstract

“…1 Because of its high conductivity with respect to oxygen ions, CeO 2 is considered to be a good material for use in solid oxide fuel cells 2,3 and oxygen monitors. 4 Due to its properties of high oxygen ion conductivity, it can be also used as a catalytic support 5 in automotive exhaust systems. The incorporation of rare-earth metal cations including praseodymium (Pr) to the ceria lattice has been reported to improve the performance of these catalysts.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of praseodymium-doped ceria powders by a microwave-assisted hydrothermal (MH) route

et al. 2005

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The Effect of Adding Ce_1–_xSm_xO_2–_x_/2 with Different Sm Contents on the Electrochemical Performance of GdBaCo₂O_5+δ Based Composite Cathode

Lü

Wei

et al. 2013

Fuel Cells

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In this paper, the Ce1–xSmxO2–x/2 (x = 0.025, 0.05, 0.1, 0.2) samples were synthesized and then mixed with GdBaCo2O5+δ (GBCO) to form GBCO–Ce1–xSmxO2–x/2 composite cathodes. The electrochemical performance of the composite cathodes was investigated by the electrochemical impedance spectroscopy (EIS) as a function of temperature and oxygen partial pressure. The impedance spectra results demonstrated that the introduction of proper Ce1–xSmxO2–x/2 phase remarkably enhanced the electrochemical performance of GBCO cathode and caused a reduction in the total polarization resistance (Rp). Furthermore, as the amount of Ce1–xSmxO2–x/2 in composite cathode was fixed, the variation of Sm content in Ce1–xSmxO2–x/2 also had a significant influence on the electrochemical performance of the GBCO–Ce1–xSmxO2–x/2 cathodes. For example, the Rp of GBCO cathodes containing 10 wt.% Ce1–xSmxO2–x/2 considerably reduced from 0.37 to 0.17 Ω cm2 at 600 °C with the decreasing Sm content x from 0.2 to 0.025. The improvement in performance of the GBCO–Ce1–xSmxO2–x/2 cathodes compared to pure GBCO cathode could be mainly attributed to the catalytic activity of Ce1–xSmxO2–x/2 towards the surface diffusion related processes, which was an elementary step in oxygen reduction reaction at cathode.

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High temperature pH sensing and O2− conduction properties of electrophoretically fabricated ceria composites

Cited by 7 publications

References 8 publications

Effect of pH of Medium on Hydrothermal Synthesis of Nanocrystalline Cerium(IV) Oxide Powders

Effect of pH of Medium on Hydrothermal Synthesis of Nanocrystalline Cerium(IV) Oxide Powders

Synthesis and characterization of praseodymium-doped ceria powders by a microwave-assisted hydrothermal (MH) route

The Effect of Adding Ce_1–_xSm_xO_2–_x_/2 with Different Sm Contents on the Electrochemical Performance of GdBaCo₂O_5+δ Based Composite Cathode

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High temperature pH sensing and O2− conduction properties of electrophoretically fabricated ceria composites

Cited by 7 publications

References 8 publications

Effect of pH of Medium on Hydrothermal Synthesis of Nanocrystalline Cerium(IV) Oxide Powders

Effect of pH of Medium on Hydrothermal Synthesis of Nanocrystalline Cerium(IV) Oxide Powders

Synthesis and characterization of praseodymium-doped ceria powders by a microwave-assisted hydrothermal (MH) route

The Effect of Adding Ce1–xSmxO2–x/2 with Different Sm Contents on the Electrochemical Performance of GdBaCo2O5+δ Based Composite Cathode

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Product

Resources

About

The Effect of Adding Ce_1–_xSm_xO_2–_x_/2 with Different Sm Contents on the Electrochemical Performance of GdBaCo₂O_5+δ Based Composite Cathode