Gadolinia-doped ceria and yttria stabilized zirconia interfaces: regarding their application for SOFC technology

Tsoga, A.; Gupta, Abhay; Naoumidis, A.; Nikolopoulos, P.

doi:10.1016/s1359-6454(00)00261-5

Cited by 325 publications

(209 citation statements)

References 12 publications

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“…This indicates that the fracture strength is very sensitive to the crack length. A scanning electron microscopy (SEM) image of gadolinia-doped ceria published by Tsoga et al 48 showed that the defect size is about 1.0 μm. Using SEM, Leng et al 49 showed that the gadoliniadoped ceria defect was about 2.0 μm.…”

Section: Resultsmentioning

confidence: 99%

Communication: Different behavior of Young's modulus and fracture strength of CeO2: Density functional theory calculations

Sakanoi

Shimazaki

et al. 2014

The Journal of Chemical Physics

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In this Communication, we use density functional theory (DFT) to examine the fracture properties of ceria (CeO 2 ), which is a promising electrolyte material for lowering the working temperature of solid oxide fuel cells. We estimate the stress-strain curve by fitting the energy density calculated by DFT. The calculated Young's modulus of 221.8 GPa is of the same order as the experimental value, whereas the fracture strength of 22.7 GPa is two orders of magnitude larger than the experimental value. Next, we combine DFT and Griffith theory to estimate the fracture strength as a function of a crack length. This method produces an estimated fracture strength of 0.467 GPa, which is of the same order as the experimental value. Therefore, the fracture strength is very sensitive to the crack length, whereas the Young's modulus is not.

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Section: Resultsmentioning

confidence: 99%

Communication: Different behavior of Young's modulus and fracture strength of CeO2: Density functional theory calculations

Sakanoi

Shimazaki

et al. 2014

The Journal of Chemical Physics

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“…5). This solid solution is an insulating layer that has a low ionic conductivity [7,10]. Nguyen et al studied a GDC interlayer between an LSCF cathode and a scandia-stabilized zirconia (ScSZ) electrolyte, which was deposited by screen-printing [17].…”

Section: Resultsmentioning

confidence: 99%

“…However, GDC has poor sintering properties; therefore, it is difficult to fabricate a thin dense layer on the YSZ. Also, (Zr, Ce)O 2 -based solid solutions can form between the YSZ electrolyte and the GDC layer at 1200℃, and have a much lower ionic conductivity than GDC and YSZ [10]. Thus, it is very important to optimize the GDC sintering temperature to obtain a dense electrolyte, minimizing the formation of a (Zr, Ce)O 2 -based solid-solution insulating-phase.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Fabrication Conditions for GDC Buffer Layer on Electrochemical Performance of Solid Oxide Fuel Cells

et al. 2013

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Abstract:A Gd-doped ceria (GDC) buffer layer is required between a conventional yttria-stabilized zirconia (YSZ) electrolyte and a La-Sr-Co-Fe-O3 (LSCF) cathode to prevent their chemical reaction. In this study, the effect of varying the conditions for fabricating the GDC buffer layer, such as sintering temperature and amount of sintering aid, on the solid oxide fuel cell (SOFC) performance was investigated. A finer GDC powder (i.e., ultra-high surface area), a higher sintering temperature (∼1290℃), and a larger amount of sintering aid (∼12%) resulted in improved densification of the buffer layer; however, the electrochemical performance of an anode-supported cell containing this GDC buffer layer was poor. These conflicting results are attributed to the formation of (Zr, Ce)O2 and/or excess cobalt grain boundaries (GBs) at higher sintering temperatures with a large amount of sintering aid (i.e., cobalt oxide). A cell comprising of a cobalt-free GDC buffer layer, which was fabricated using a low-temperature process, had lower cell resistance and higher stability. The results indicate that electrochemical performance and stability of SOFCs strongly depend on fabrication conditions for the GDC buffer layer.

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“…However, at these temperatures CGO and YSZ form a solid solution which has a significantly lower oxide ion conductivity compared to both of the pure compounds. [21][22][23] An alternative way to fabricate CGO barriers are by physical vapor deposition techniques such as magnetron sputtering, pulsed laser ablation, and electron beam evaporation. [16,20,24] Studies comparing deposition techniques have provided evidence that CGO barrier layers fabricated by reactive magnetron sputtering show better performance.…”

Section: Introductionmentioning

confidence: 99%

Strontium Diffusion in Magnetron Sputtered Gadolinia‐Doped Ceria Thin Film Barrier Coatings for Solid Oxide Fuel Cells

Sønderby

Popa

et al. 2013

Advanced Energy Materials

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is prepared to simulate a solid oxide fuel cell. This setup allows observation of Sr diffusion by observing SrZrO 3 formation using X-ray diffraction while annealing. Subsequent electron microscopy confirms the results. This approach presents a simple method for assessing the quality of CGO barriers without the need for a complete fuel cell test setup. CGO films with thicknesses ranging from 250 nm to 1.2 µm are tested at temperatures from 850 °C to 950 °C which yields an in-depth understanding of Sr diffusion through CGO thin films that may be of high scientific and technical interest for implementation of novel fuel cell materials. Sr is found to diffuse along column/grain boundaries in the CGO films but by modifying the film thickness and microstructure the breaking temperature of the barrier can be increased.2 2

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Gadolinia-doped ceria and yttria stabilized zirconia interfaces: regarding their application for SOFC technology

Cited by 325 publications

References 12 publications

Communication: Different behavior of Young's modulus and fracture strength of CeO2: Density functional theory calculations

Communication: Different behavior of Young's modulus and fracture strength of CeO2: Density functional theory calculations

The Effect of Fabrication Conditions for GDC Buffer Layer on Electrochemical Performance of Solid Oxide Fuel Cells

Strontium Diffusion in Magnetron Sputtered Gadolinia‐Doped Ceria Thin Film Barrier Coatings for Solid Oxide Fuel Cells

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