Effect of preparation method on the properties of nanostructured gadolinia-doped ceria materials for IT-SOFCs

Muñoz, Fernando F.; Leyva, A.G.; Baker, Richard T.; Fuentes, Rodolfo O.

doi:10.1016/j.ijhydene.2011.12.094

Cited by 10 publications

(7 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, lowering the temperature of SOFCs has been one of the main targets for recent research (1). From this point of view, ceria-based ceramics represent promising materials (2). Highly abundant, cerium oxide (CeO 2 ) is an important inorganic material because it can be used in various applications as a 3-way catalytic support for the elimination of toxic auto exhaust gases, for low-temperature water–gas shift (WGS) reactions, and as an oxygen sensor, fuel cell electrolyte, glass-polishing material etc.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of the Mineralizer Solution in the Hydrothermal Synthesis of Gadolinium-Doped (10% mol Gd) Ceria Nanopowders

Dell’Agli

Spiridigliozzi

Marocco

et al. 2016

Journal of Applied Biomaterials & Functional Materials

View full text Add to dashboard Cite

By the coprecipitation method, it has been possible to synthesize nanosized gadolinium-doped cerium oxide in a fluorite structure, stable in a wide range of temperatures. Hydrothermal treatment directly on the as-synthesized coprecipitates, without any drying step, had a very positive effect on the powders, which can be sintered with a high degree of densification, especially with an optimized sintering cycle. Furthermore, the electrical behavior of these samples was very interesting, especially for the samples synthesized using neutral mineralizer solution and basic mineralizer solution.

show abstract

Section: Introductionmentioning

confidence: 99%

“…However, one of the main drawbacks of ceria-based materials is related to the high temperature required to obtain sintered materials of high density (2). Therefore, for these applications, it is important to obtain ultrafine powders.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Mineralizer Solution in the Hydrothermal Synthesis of Gadolinium-Doped (10% mol Gd) Ceria Nanopowders

Dell’Agli

Spiridigliozzi

Marocco

et al. 2016

Journal of Applied Biomaterials & Functional Materials

View full text Add to dashboard Cite

show abstract

“…Ceria (CeO 2 ) based ceramic materials have attracted much interest in many applications such as chemical-mechanical polishing media, automobile exhaust catalysts and supports, dense ceramic membranes for oxygen separation, lowtemperature water-gas shift (WGS) reactions, and oxygen sensors [1]. A preeminent role is occupied by rare-earthdoped ceria used as electrolyte in IT-SOFC, that is, cells operating in the intermediate temperature range (500-700 ∘ C) [2][3][4][5]. In fact, the decrease of the operating temperature in SOFC is a very important goal for reducing interfacial reactions between cell components, mechanical and thermal degradation, and thermal expansion mismatch [6].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Precipitating Agent on the Synthesis and Sintering Behavior of 20 mol% Sm-Doped Ceria

Spiridigliozzi

Dell’Agli

Biesuz

et al. 2016

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

Nanocrystalline 20 mol% samaria-doped ceria powders (Ce0.8Sm0.2O1.9) were synthesized by coprecipitation techniques using various precipitating agents in aqueous solution: ammonia, ammonium carbonate, tetramethylammonium hydroxide, and urea. The synthesized powders after calcination at 600°C possess a fluorite structure with nanometric size although they are characterized by a very different morphology and degree of agglomeration. Remarkable differences appear in the sintering behavior, especially because of the presence of hard agglomerates. The precipitating agent has therefore a crucial role in the coprecipitation process, which influences the morphology of the powders and in turn the sintering behavior. The obtained results clearly reveal that ammonium carbonate and urea are the best precipitating agents to obtain final dense products after sintering.

show abstract

“…This is in good agreement with the crystallite dimensions estimated from the peak broadening in the XRD patterns ( Table 1) and with previously prepared nanostructured ceria-based mixed oxide structures. 11,22,23 In some TEM images in Figure 4, small, lighter contrast areas were observed within some particles which may indicate internal pores or cavities. These are seen close to the centre of a minority of the particles in GDC10 (Figure 4(a) and (b)) and to a lesser extent in the PrDC10.…”

Section: Sem and Tem Studiesmentioning

confidence: 99%

Redox properties of nanostructured lanthanide-doped ceria spheres prepared by microwave assisted hydrothermal homogeneous co-precipitation

et al. 2015

View full text Add to dashboard Cite

In this work, nanostructured Ln x Ce 1-x O 2- (Ln: Gd and Pr; x = 0.1 and 0.2) spheres were synthesized by microwave assisted hydrothermal homogeneous co-precipitation and their properties were characterized by synchrotron radiation XRD, X-ray absorption near-edge spectroscopy (XANES) and scanning and high resolution electron microscopy (SEM and HRTEM). In situ XRD and XANES experiments were carried out under reducing and oxidizing conditions in order to investigate the redox behaviour of these materials. The nanostructured mixed oxide spheres were found to have a cubic crystal structure (Fm3m space group). The spheres were composed of nanoparticles with an average crystallite size of about 10 nm. The Ln 0.1 Ce 0.9 O 2- compositions exhibited the highest specific surface area (~60 m 2 g-1). In situ XRD experiments showed an increase in lattice parameters on reduction which was attributed to the reduction of Ce 4+ and Pr 4+ cations to Ce 3+ and Pr 3+ , which have larger radii, and to the associated increase in V O concentration. This increase in lattice parameter was much more pronounced for PrDC than GDC, and was explained by the much larger change in ionic radius for Pr on reduction. XANES absorption experiments at the Ce and Pr L 3-edge showed that the changes observed on reduction of the Pr-containing samples resulted mostly from the formation of Pr 3+ rather than Ce 3+ , and supported the previously-reported proposal that Pr 3+ has a stabilizing effect on Ce 4+ .

show abstract

Effect of preparation method on the properties of nanostructured gadolinia-doped ceria materials for IT-SOFCs

Cited by 10 publications

References 19 publications

Effect of the Mineralizer Solution in the Hydrothermal Synthesis of Gadolinium-Doped (10% mol Gd) Ceria Nanopowders

Effect of the Mineralizer Solution in the Hydrothermal Synthesis of Gadolinium-Doped (10% mol Gd) Ceria Nanopowders

Effect of the Precipitating Agent on the Synthesis and Sintering Behavior of 20 mol% Sm-Doped Ceria

Redox properties of nanostructured lanthanide-doped ceria spheres prepared by microwave assisted hydrothermal homogeneous co-precipitation

Contact Info

Product

Resources

About