Microstructure and Grain‐Boundary Effect on Electrical Properties of Gadolinium‐Doped Ceria

Zhou, Xiao‐Dong; Huebner, Wayne; Kosacki, Igor; Anderson, Harlan U.

doi:10.1111/j.1151-2916.2002.tb00349.x

Cited by 80 publications

(60 citation statements)

References 13 publications

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“…It is inferred that the higher activation energy and lower total conductivity at T < 400 • C is due to the larger grain boundary area and consequently the higher grain boundary resistivity of the 1200 • C sample. Zhou et al have shown that grain boundary resistivity in CGO10 becomes neglectable at temperatures >600 • C [26]. The effect of grain size can therefore only be detected at low temperatures.…”

Section: Resultsmentioning

confidence: 97%

The Effect of Cobalt Oxide Addition on the Conductivity of Ce0.9Gd0.1O1.95

Jud

Gauckler

2005

J Electroceram

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The conductivity of cobalt oxide doped Ce 0.9 Gd 0.1 O 1.95 (CGO10) of various doping concentrations, sintering temperatures, dwell times, and cooling rates was investigated by 4-point DC conductivity measurements. In cobalt oxide doped CGO10, an enhanced total conductivity occuring with a low activation energy of 0.54 eV was detected below 250 • C in quenched samples. If the same samples were cooled down slowly, only the ionic conductivity of undoped CGO with an activation energy of 0.8 eV was found. The increased conductivity is attributed to a percolating network of an electronically conducting grain boundary phase rich in CoO, which can be retained by quenching from temperatures between 900 and 1000 • C.

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Section: Resultsmentioning

confidence: 97%

The Effect of Cobalt Oxide Addition on the Conductivity of Ce0.9Gd0.1O1.95

Jud

Gauckler

2005

J Electroceram

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“…Experimental conditions always imply the presence of different 1D (e.g., dislocations) and 2D (e.g., grain boundaries) defects, which substantially reduces the conductivity. In particular, [20], Zhu et al [21], and Zhou et al [22]. All the experimental data are for 10 at.…”

Section: E Temperature Dependence Of Conductivitymentioning

confidence: 99%

Ionic conductivity in Gd-dopedCeO2:Ab initiocolor-diffusion nonequilibrium molecular dynamics study

et al. 2016

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A first-principles nonequilibrium molecular dynamics (NEMD) study employing the color-diffusion algorithm has been conducted to obtain the bulk ionic conductivity and the diffusion constant of gadolinium-doped cerium oxide (GDC) in the 850-1150 K temperature range. Being a slow process, ionic diffusion in solids usually requires simulation times that are prohibitively long for ab initio equilibrium molecular dynamics. The use of the color-diffusion algorithm allowed us to substantially speed up the oxygen-ion diffusion. The key parameters of the method, such as field direction and strength as well as color-charge distribution, have been investigated and their optimized values for the considered system have been determined. The calculated ionic conductivity and diffusion constants are in good agreement with available experimental data.

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“…Since GDC is almost eight times more expensive than undoped-CeO 2 , this could be an efficient approach to realize intermediate-temperature SOFCs. However, the hydrogen reduction reaction also occurs at the ASL and the oxygen ion conductivity of CeO 2 is lower than that of GDC; the catalytic properties of undoped-CeO 2 thus need to be enhanced [18,19]. Moreover, there are studies referring that when the ionic conductivity of the oxide material in anode layer was improved, the cell showed enhanced performance in anode side [20].…”

Section: Introductionmentioning

confidence: 91%