Microstructure and electrical properties of nano-sized Ce1-xGdxO2 (0 .LEQ. x .LEQ. 0.2) particles prepared by spray pyrolysis

Jung, Dae Soo; Lee, Sang Ho; Han, Jin Man; Hwang, Hae Jin; Lee, Jong Heun

doi:10.2109/jcersj2.116.969

Cited by 6 publications

(3 citation statements)

References 27 publications

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“…Since the doped cerias in the previous investigations showed the highest electrical conductivities with a dopant content of about 10 mol%, 20,36 we used this value for the tests in the current work aimed at reducing the Gd content. After firing at 1500 • C, each of the CeO 2 , CG100x and CY100x samples crystallized in the cubic fluorite space group Fm3m (No.…”

Section: Resultsmentioning

confidence: 99%

“…The lattice parameters of these samples were found to be in good agreement with those reported previously. 19,20,[36][37][38] Figure 1a shows the temperature dependence of total electrical conductivity of CG100x and CY100x in air. The electrical conductivities of CG10 and CY10, and the activation energy in the temperature range from 400 to 600 • C were almost the same as those reported by many authors.…”

Section: Resultsmentioning

confidence: 99%

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Reducing the Gadolinium Dopant Content by Partial Substitution with Yttrium in a Ce_0.9Gd_0.1O_1.95-Based Oxide-Ion Conductor

Mori¹,

Sumi²,

Suda³

2017

J. Electrochem. Soc.

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Ce 0.9 Gd 0.1 O 1.95 is widely used as an oxide-ion conductor in solid-state electrochemical cells, but the Gd dopant is costly. We aimed to reduce the Gd content in this type of conductor by carrying out tests on the Ce 0.9 Gd 0.1-x Y x O 1.95 system. The sintering characteristics of Ce 0.9 Y 0.1 O 1.95 were better than those of Ce 0.9 Gd 0.1 O 1.95 . The electrical conductivity of Ce 0.9 Y 0.1 O 1.95 at 600 • C was 0.0184 S cm −1 , which was approximately 71% of that of Ce 0.9 Gd 0.1 O 1.95 . Each co-doped Ce 0.9 Gd 0.1-x Y x O 1.95 ceria sample investigated was found to form a single fluorite phase. With increasing Y content, the sintering characteristics of Ce 0.9 Gd 0.1-x Y x O 1.95 had a tendency to approach to those of Ce 0.9 Y 0.1 O 1.95 . The conductivity of Ce 0.9 Gd 0.075 Y 0.025 O 1.95 at 600 • C was 0.0259 S cm −1 , the same as that of Ce 0.9 Gd 0.1 O 1.95 . After aging at 600 • C, rates of decrease in conductivity for Ce 0.9 Gd 0.075 Y 0.025 O 1.95 were almost the same as those of Ce 0.9 Gd 0.1 O 1.95 . These results suggested that it is possible to reduce the Gd content in Ce 0.9 Gd 0.1 O 1.95 by 25% through substitution with Y.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Reducing the Gadolinium Dopant Content by Partial Substitution with Yttrium in a Ce_0.9Gd_0.1O_1.95-Based Oxide-Ion Conductor

Mori¹,

Sumi²,

Suda³

2017

J. Electrochem. Soc.

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“…This result is related to the larger size of Gd 3+ ion (radius 0.097 nm) than Ce 4+ ion (radius 0.090 nm). According to Jung et al, the logarithimic conductivity of Ce 1−x Gd x O 2−x/2 at 873−1173 K in air increases with increasing x value and reaches a constant value in x = 0.1−0.2 [7]. This result indicates that the oxygen vacancy formed above x = 0.1 has no significant influence on the diffusion of oxide ions.…”

Section: Characteristics Of Raw Powders Andmentioning

confidence: 94%

Influence of Composition of Gd-Doped Ceria Electrolyte on Performance of Solid Oxide Fuel Cell

Ibusuki

Hirata

Sameshima

et al. 2012

MSF

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Cell performance was measured for four types of Ni (40 vol%)-Gd-doped ceria (GDC) anode-supported solid oxide fuel cells with GDC electrolyte (40-120 μm thickness) of Ce1-xGdxO2-x/2 compositions (x = 0.05, 0.1, 0.15 and 0.2) at 773-1073 K using a H2 fuel. (La0.8Sr0.2)(Co0.8Fe0.2)O3 cathode was printed on the GDC films. The open circuit voltage and maximum power density at 873-1073 K showed a maximum at x = 0.1. The maximum power density at x = 0.1 was 166 and 506 mW/cm2 at 873 and 1073 K, respectively. The excess oxygen vacancy at x = 0.1-0.2, which does not contribute to the oxide ion conductivity, reacts with a H2 fuel to form electrons (H2 + VO 2H+ + VO×, VO× VO + 2e-). This reaction reduces the cell performance.

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Interactions between CeO2 and Ni P for enhancing coking and sulfur resistance in autothermal reforming of liquid hydrocarbons

Liu

Hong

2012

Fuel

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Microstructure and electrical properties of nano-sized Ce1-xGdxO2 (0 .LEQ. x .LEQ. 0.2) particles prepared by spray pyrolysis

Cited by 6 publications

References 27 publications

Reducing the Gadolinium Dopant Content by Partial Substitution with Yttrium in a Ce_0.9Gd_0.1O_1.95-Based Oxide-Ion Conductor

Reducing the Gadolinium Dopant Content by Partial Substitution with Yttrium in a Ce_0.9Gd_0.1O_1.95-Based Oxide-Ion Conductor

Influence of Composition of Gd-Doped Ceria Electrolyte on Performance of Solid Oxide Fuel Cell

Interactions between CeO2 and Ni P for enhancing coking and sulfur resistance in autothermal reforming of liquid hydrocarbons

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Microstructure and electrical properties of nano-sized Ce1-xGdxO2 (0 .LEQ. x .LEQ. 0.2) particles prepared by spray pyrolysis

Cited by 6 publications

References 27 publications

Reducing the Gadolinium Dopant Content by Partial Substitution with Yttrium in a Ce0.9Gd0.1O1.95-Based Oxide-Ion Conductor

Reducing the Gadolinium Dopant Content by Partial Substitution with Yttrium in a Ce0.9Gd0.1O1.95-Based Oxide-Ion Conductor

Influence of Composition of Gd-Doped Ceria Electrolyte on Performance of Solid Oxide Fuel Cell

Interactions between CeO2 and Ni P for enhancing coking and sulfur resistance in autothermal reforming of liquid hydrocarbons

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Product

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Reducing the Gadolinium Dopant Content by Partial Substitution with Yttrium in a Ce_0.9Gd_0.1O_1.95-Based Oxide-Ion Conductor

Reducing the Gadolinium Dopant Content by Partial Substitution with Yttrium in a Ce_0.9Gd_0.1O_1.95-Based Oxide-Ion Conductor