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

Jud, Eva; Gauckler, Ludwig J.

doi:10.1007/s10832-005-2193-3

Cited by 60 publications

(42 citation statements)

References 32 publications

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“…Enriched cobalt oxide boundary layers were further confirmed for CGO20 samples at 900 • C, but distinct areas of higher cobalt oxide concentration were detected as well [19]. The existence of cobalt oxide in the grain boundary after long dwell times has recently been confirmed again on the basis of conductivity measurements [20].…”

Section: Introductionmentioning

confidence: 67%

Microstructure of cobalt oxide doped sintered ceria solid solutions

Jud¹,

Zhang²,

Sigle³

et al. 2006

J Electroceram

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The sintering of ceria solid solutions, such as Ce 0.9 Gd 0.1 O 1.95 (CGO10), is strongly promoted by the addition of 1 cat% of cobalt oxide, lowering the maximum sintering temperature by 200 • C and triplicating the maximum densification rate. This change in sintering behavior results from cobalt ion segregated at the grain boundaries. An average cobalt ion boundary coverage is at maximum 3.0 ± 1.9 at/nm 2 and is shown to depend on the cooling rate. Coverage by segregated gadolinium is also found and amounts to 13.2 ± 11.4 at/nm 2 for a slowly cooled sample. From cobalt excess measured at the boundary, an estimated concentration of only 0.06 cat% of cobalt oxide is necessary to promote the sintering effect. The remaining amount of cobalt oxide is found in triple points and as particles in clusters. It is expected that the amount of cobalt oxide necessary for fast densification can be reduced with a doping process that distributes the additives more homogeneously.

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Section: Introductionmentioning

confidence: 67%

Microstructure of cobalt oxide doped sintered ceria solid solutions

Jud¹,

Zhang²,

Sigle³

et al. 2006

J Electroceram

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“…5), is obtained by averaging the conductivities from different runs at the temperature, which in turn was obtained by averaging the actual temperatures of individual runs. In Table I the experimental [5,20] and previous theoretical [8] values of the ionic conductivity in the GDC system with 10 at. % of Gd interpolated to the considered averaged temperature of T = 1146 K are shown for comparison.…”

Section: Initial Vacancy Positionmentioning

confidence: 99%

“…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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“…Co-doping of GDC was also used to enhance the conductivity. The addition of cobalt oxide into GDC increases the conductivity, which is attributed to the electronic conduction of grain boundary phase rich with CoO [157]. Co-doping of GDC by small amount of TiO 2 also reduces the grain-boundary resistance [158].…”

Section: Scandia-stabilized Zirconiamentioning

confidence: 99%

State-of-the-Art Thin Film Electrolytes for Solid Oxide Fuel Cells

Nandasiri

Thevuthasan

2015

Thin Film Structures in Energy Applications

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State-of-the-art solid oxide fuel cells (SOFC) are among the main candidates for clean energy technology due to their high efficiency, fuel flexibility, low air pollution, and minimal greenhouse gas emission. However, high operational temperature of SOFC is a greater challenge in commercialization of these devices for low cost and portable applications. High temperature operation of SOFC degrades its performance with aging, limits the selection of materials for fuel cell components, and increases the fabrication cost. Thus, there have been enormous efforts to improve the properties of existing materials and develop new materials for SOFC components in order to lower the operating temperature of SOFC. Recent advances in thin film technology have also been utilized to develop new materials with improved properties for SOFC. One of the key components in SOFC is the electrolyte and several research groups are working on developing new electrolyte materials. In this chapter, we will discuss the recent advances in thin film SOFC electrolytes. This extensive discussion includes the evolution of doped ceria, doped zirconia, and multilayer hetero-structured thin film electrolytes. The newly developed nanoscale thin films and multilayer hetero-structures with improved oxygen ionic conductivity will have significant impact on SOFC devices. Introduction Background of Solid Oxide Fuel Cells (SOFC)The latest U.S. energy reviews revealed that more than 80 % of the energy consumed in the world is still produced by non-renewable energy sources such as petroleum, natural gas, and coal [1]. Moreover, it is projected that world energy consumption will grow by 56 % from 2010 to 2040. Therefore, from a long-term energy perspective, clean energy technologies are needed to utilize primary energy

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

Cited by 60 publications

References 32 publications

Microstructure of cobalt oxide doped sintered ceria solid solutions

Microstructure of cobalt oxide doped sintered ceria solid solutions

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

State-of-the-Art Thin Film Electrolytes for Solid Oxide Fuel Cells

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