Characterisation of (CeO2)0.8(GdO1.5)0.2 synthesised using various techniques

Torrens, Rob; Sammes, Nigel M.; Tompsett, Geoffrey A.

doi:10.1016/s0167-2738(98)00172-6

Cited by 104 publications

(64 citation statements)

References 9 publications

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“…Operating SOFCs below 800°C (intermediate temperature, IT) would also yield faster start-up times for portable use, increase efficiency and stability, and diminish excessive power consumption for reaching and operating the SOFC at high temperature. This has driven the development of IT-SOFCs in recent years [2,3]. Extending this development to even lower temperature (<600°C) could potentially open up the transportation and portable power markets to SOFCs.…”

Section: Introductionmentioning

confidence: 99%

Stable and high conductivity ceria/bismuth oxide bilayer electrolytes for lower temperature solid oxide fuel cells

Park

Wachsman

2006

Ionics

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A highly conductive bismuth oxide/ceria bilayer electrolyte was developed to reduce solid oxide fuel cell (SOFC) operating temperatures. Bilayer electrolytes were fabricated by depositing a layer of Er 0.2 Bi 0.8 O 1.5 (ESB) of varying thickness via pulsed laser deposition and dip-coating on a Sm 0.2 Ce 0.8 O 1.9 (SDC) substrate. The open-circuit potential (OCP) and ionic transference number (t i ) of ESB/ SDC electrolytes were tested in a fuel cell arrangement as a function of relative thickness, temperature, and P O 2 with H 2 / H 2 O and CO/CO 2 on the anode side and air on the cathode side. These EMF measurements showed a significant increase in OCP and t i with the bilayer structure, as compared to the cells with a single SDC electrolyte layer. Furthermore, improvement in the OCP and t i of bilayer SOFCs was observed with increasing relative thickness of the ESB layers. Hence, the bilayer structure overcomes the limited thermodynamic stability of bismuth oxides and prevents electronic conductivity of ceria-based oxides in reducing atmosphere.

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Section: Introductionmentioning

confidence: 99%

Stable and high conductivity ceria/bismuth oxide bilayer electrolytes for lower temperature solid oxide fuel cells

Park

Wachsman

2006

Ionics

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“…Gadolinia-doped ceria (GDC)-based fluorite cubic materials have attracted extensive attention worldwide lately owing to their potential as the electrolyte for solid oxide fuel cells (SOFCs) to operate at intermediate temperatures (IT) [1][2][3][4][5][6][7][8][9][10][11]. Such enormous interest derives from the much higher ionic conductivity of GDC electrolytes than the state-of-the-art electrolyte made of yttria-stablized zirconia (YSZ) [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

“…However, it is very difficult to achieve dense GDC bodies by conventional sintering at relatively low temperatures (< 1300°C) [4,7,8,14,15]. High sintering temperatures have to be used, but may destroy or adversely affect the other materials in SOFCs.…”

Section: Introductionmentioning

confidence: 99%

“…Many studies have been conducted to reduce the sintering temperature of GDC [4,7,8,14,15]. Conventional methods of preparing dense ceria-based membranes typically entail two major steps.…”

Section: Introductionmentioning

confidence: 99%

“…The first step is to synthesize ceria-based powders through several methods such as co-precipitation [7,8,16], solid-state reaction [17], mechanochemical processing [18], combustion synthesis [4,19], selfpropagating synthesis [20], sol-gel process [10,11,[21][22][23], sol-gel combustion approach [15], and hydrothermal synthesis [24]. The second step is to sinter the powder compact to form dense membranes [4,7,8,14,15,22,23]. Sintering temperatures as high as 1400-1600°C have been frequently used in order to achieve high density membranes (> 95% of the theoretical density) [4,8,15,23,25].…”

Section: Introductionmentioning

confidence: 99%

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Low Temperature Sintering of Gadolinium‐Doped Ceria for Solid Oxide Fuel Cells

Lavorato

Shaw

2012

Ceramic Transactions Series

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Gadolinia-doped ceria (GDC, Ce0.eGd0.201.9) powder with particle sizes smaller than 10 nm is synthesized via co-precipitation. The effects of powder pre-treatment before sintering on sinterability of the GDC nanopowder are investigated. It is found that low speed, dry milling of the as-synthesized powder leads to enhancements in sinterability for sintering temperatures at 1000, 1100 and 1200°C. As a result, the pellets made from the dry milled powder exhibit the highest densities among all the sintered pellets investigated in this study. In contrast, calcination at 400°C of the as-synthesized powder leads to lower density pellets sintered at 1000 and 1100°C in comparison with those pellets made from the as-synthesized powder and the dry milled powder. The pellets using the dry milled powder sintered at 1200°C reach the density of 94% of the theoretical and contain only isolated micrometer and nanometer pores. As such, these GDC membranes can be used as the electrolyte for solid oxide fuel cell applications because they are impermeable to gaseous fuels and oxidants. The mechanisms for the enhanced sinterability due to dry milling and the decreased sinterability due to calcination are discussed.

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