The Electrical Conductivity of CaO-Doped Nonstoichiometric Cerium Dioxide from 700° to 1500°C

Blumenthal, R. N.; Brugner, F. S.; Garnier, John E.

doi:10.1149/1.2403668

Cited by 148 publications

(60 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…air atmosphere). The results indicate that polycrystalline nano structured СеО 2 with a grain size of ≈ (10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) nm is characterized by more than two orders larger conductivity coefficient σ in comparison to the conductivity of a conventional polycrystal with a grain size ≈ (50-100) nm.…”

Section: Introductionmentioning

confidence: 95%

“…Segregation can be limited by using an electrolyte with a minimum content of impurities, and also by lowering the operating temperature. CeO 2 is considered as an intermediate-temperature SOFC (IT-SOFC) electrolyte as it has an electric conductivity coefficient σ in the temperature range 500-1000 °С, which is an order of magnitude larger than YSZ [10][11][12]. Here we propose to use nano-structured polycrystalline СеО 2 as an IT-SOFC electrolyte because it satisfies these requirements.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced oxygen diffusion in nano-structured ceria

Boyko

Biletskyi

Богданов

et al. 2018

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

Nano-structured polycrystalline СеО 2 is proposed to be used as a candidate electrolyte material for solid oxide fuel cells (SOFC) operating at temperatures ≤ 600 °С. Here we show that in this material the diffusion activation energy of oxygen ions is 0.35 eV. The diffusion mechanism corresponds to the "single-file" diffusion mechanism, associated with the presence of one-dimensional channels in the anion sublattice of СеО 2 . The small grain size of the material ≈ 10 nm, as well as its stoichiometric state (Се 2 О 3 ), minimize the contribution of the electronic and polaron components of the electrical conductivity of this material, which also contribute to the optimization of SOFC operation.

show abstract

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Enhanced oxygen diffusion in nano-structured ceria

Boyko

Biletskyi

Богданов

et al. 2018

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

show abstract

“…Especially, gadolinia-doped ceria (GDC) and samariadoped ceria (SDC) exhibit high conductivity at low temperatures, compared to zirconia-based electrolytes [115][116][117][118][119][120][121][122]. However, ceria-based materials have shown increased electronic conductivity, when exposed to reducing environment at high temperatures and low oxygen partial pressures [113,[123][124][125][126][127]. The mixed ionic and electronic conductivity of doped ceria materials under different operating conditions has been studied using ionic transference number.…”

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

View full text Add to dashboard Cite

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

show abstract

“…The starting structure models for the sample mixtures and the industrial glass ceramic were: corundum from Ishizawa et al [46], hydroxyapatite from Sudarsanan and Young [47], quartz from Le Page and Donnay [48], zircon from Hazen and Finger [49], spinel from Peterson, Lager and Hitterman [50], and ceria from Blumental et al [51]. The LP correction used in the refinements with Chebyshev function with a variable number of coefficients depending on its complexity; (b) the peak profiles were modelled using a pseudo-Voigt function with one Gaussian and one Lorenzian component; c) The lattice constants, the phase fractions and the coefficients corresponding to the sampie displacement and asymmetry were also refined.…”

Section: Rietveld Refinementsmentioning

confidence: 99%

The Quantitative Determination of the Crystalline and the Amorphous Content by the Rietveld Method: Application to Glass Ceramics with Different Absorption Coefficients

Gualtieri¹,

Guagliardi²,

Iseppi³

2004

Diffraction Analysis of the Microstructure of Materials

View full text Add to dashboard Cite

The Rietveld method provides an accurate determination of the crystalline and the amorphous fractions in polyphase mixtures. To determine the content of the amorphous phase, the sample is diluted with an internal standard which is considered as a component itself and refined with the other phases. Although the method is accurate for systems containing crystalline and amorphous phases with an absorption coefficient comparable to that of the standard, it was not thoroughly tested for systems containing a weakly or highly absorbing amorphous phase. Commonly, this is the case for glass ceramics which may contain elements with fairly different atomic number.X-ray powder diffraction data refined with the Rietveld method were utilized for the determination of the amorphous content in a number of systems containing glasses with different absorption coefficients (Li-, B-, Al-, P-, Zn-, Zr-, Ba-, Pb-glass) to check the accuracy of the method. The mixtures were prepared diluting the glass phase with corundum NIST 676 and hydroxyapatite NIST 2910 in fixed proportions. The refinements were carried out with GSAS and the new code QUANTO, especially developed for automatic quantitative phase analysis (QPA) of polycrystalline mixtures eventually including an amorphous component.The glass weights estimated by the two programs are both in good agreement with the nominal value (45 wt%) although a minor dependency of the calculated amorphous fraction on the linear absorption coefficient of the glass was observed and attributed to microabsorption effects. The Brindley (1945) correction applied here according to the formulation of Taylor and Matulis (1991) revealed not to be fully satisfactory for mixt ure containing an amorphous component with a very different absorption coefficient, especially when highly accurate determinations are required. This is in concert with the general concern that the existing models for the correction of microabsorption effects should be revised as they are not adequate even for systems containing only crystalline phases (Madsen et al., 2001).The method was successfully applied to a commercial glass ceramic indicating that it can be applied with a good accuracy also to glass ceramics with fairly different absorption coefficients. E. J. Mittemeijer et al. (eds.), Diffraction Analysis of the Microstructure of Materials

show abstract

The Electrical Conductivity of CaO-Doped Nonstoichiometric Cerium Dioxide from 700° to 1500°C

Cited by 148 publications

References 6 publications

Enhanced oxygen diffusion in nano-structured ceria

Enhanced oxygen diffusion in nano-structured ceria

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

The Quantitative Determination of the Crystalline and the Amorphous Content by the Rietveld Method: Application to Glass Ceramics with Different Absorption Coefficients

Contact Info

Product

Resources

About