Densification and grain growth during early-stage sintering of Ce0.9Gd0.1O1.95−δ in a reducing atmosphere

He, Zeming; Yuan, Hao; Glasscock, Julie; Chatzichristodoulou, Christodoulos; Phair, John W.; Kaiser, Andreas; Ramousse, Séverine

doi:10.1016/j.actamat.2010.03.046

Cited by 40 publications

(29 citation statements)

References 27 publications

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“…4a that under Q d = 725 kJ mol À1 , all the constructed MSCs with different heating rates are constringent, indicating the good quality of the selected Q d . Therefore, the densification activation energy for GDC is 725 kJ mol À1 , which is consistent with the value reported by He et al [11] (770 AE 40 kJ mol À1 ). Fig.…”

Section: Tablesupporting

confidence: 91%

See 1 more Smart Citation

Densification Behavior and Space Charge Blocking Effect of Bi2O3 and Gd2O3 Co-doped CeO2 as Electrolyte for Solid Oxide Fuel Cells

Guan

et al. 2015

Electrochimica Acta

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Section: Tablesupporting

confidence: 91%

“…Gd doped ceria oxide (GDC) is a new research trend due to its high ionic conductivity at 300-700 C [11,12]. However, the sintering temperature as high as 1500 C is needed due to its poor densification [13].…”

Section: Introductionmentioning

confidence: 99%

Densification Behavior and Space Charge Blocking Effect of Bi2O3 and Gd2O3 Co-doped CeO2 as Electrolyte for Solid Oxide Fuel Cells

Guan

et al. 2015

Electrochimica Acta

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“…Co-doping of GDC by small amount of TiO 2 also reduces the grain-boundary resistance [158]. The most widely studied 10GDC and 20GDC electrolytes [159][160][161][162] have been tested in fuel cell environment and reported to result in a good open circuit voltage [127,163,164].…”

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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“…Although we need to understand the behaviors of GDC in a wide range of sintering condition in reducing atmosphere for diverse applications, particularly for co-firing of MS-SOFCs, limited studies were so far reported [35][36][37]. GDC20 pellet samples were fired in various reducing atmosphere and temperature and their phase and the weight change after firing was determined at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Phase stability and oxygen non-stoichiometry of Gd-doped ceria during sintering in reducing atmosphere

Kim

2015

J Electroceram

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Firing of Gd-doped ceria (GDC) powder compact in reducing atmosphere leads to reduction and subsequent decomposition of GDC, and cracking of the pellet upon cooling, depending upon the firing temperature T and oxygen partial pressure Po 2 . In this study, GDC powder compacts were fired in various reducing atmosphere by controlling the ratio of H 2 and H 2 O mixing (H 2 O content: 0.28, 1.3, 2.7, 3 %) at temperatures T=703, 835, 975, 1088, 1180, 1262 and 1354°C. The phase and oxygen non-stoichiometry of GDC, respectively, were examined by using X-ray diffraction (XRD) and measuring the weight change of GDC pellet after cooling with fixed cooling rate to room temperature. Po 2 below which GDC decomposes was determined as a function of temperature for a fixed cooling rate (5°C/min). GDC pellets were stable at T≤1088°C regardless of Po 2 , and decomposed at T=1354°C in all tested Po 2 . A single-phase GDC without decomposition may be obtained at T=1180 or 1262°C with appropriate Po 2 . Both the degree of nonstoichiometry and the temperature are important factors to determine the stability of GDC pellet. To avoid cracking of GDC pellets due to chemical expansion during sintering in reducing atmosphere, GDC may be sintered at low T or high Po 2 or both, or it may be sintered to result in low porosity with small grain size for increased fracture strength.

show abstract

Densification and grain growth during early-stage sintering of Ce0.9Gd0.1O1.95−δ in a reducing atmosphere

Cited by 40 publications

References 27 publications

Densification Behavior and Space Charge Blocking Effect of Bi2O3 and Gd2O3 Co-doped CeO2 as Electrolyte for Solid Oxide Fuel Cells

Densification Behavior and Space Charge Blocking Effect of Bi2O3 and Gd2O3 Co-doped CeO2 as Electrolyte for Solid Oxide Fuel Cells

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

Phase stability and oxygen non-stoichiometry of Gd-doped ceria during sintering in reducing atmosphere

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