Low temperature processing of dense samarium-doped CeO2 ceramics: sintering and intermediate temperature ionic conductivity

Abstract

Samarium-doped Ceria powders for solid electrolyte ceramics were synthesized by a combustion process. Cerium nitrate and samarium nitrate were used as the starting materials, and glycine was used as fuel. Decomposition of unburned nitrogen and carbon residues was investigated by simultaneous thermogravimetry analysis and differential thermal analysis experiments. The X-ray diffraction results showed that the single-phase fluorite structure forms at a relatively low calcination temperature of 800°C. X-rays patterns of the SDC powders revealed that the crystallite size of the powders increases with increasing calcination temperature. The sintering behavior results showed that more than 96% of the relative density is obtained for powders sintered at 1,100°C for 8 h. The alternating current impedance spectroscopy results showed that the SDC15 sample sintered at 1,100°C has ionic conductivity of 0.015 Scm −1 at 650°C in air. The present work results have indicated that glycinenitrate route is a relatively low-temperature preparation technique to synthesize SDC powders with a high sinterability and a good ionic conductivity.

Intermediate temperature fuel cell with a doped ceria–carbonate composite electrolyte

“…However, the three preparation techniques produced SDC with distinctly different surface properties. In GN process, the combustion of the organic additive results in a production of gas and a porous structure with a large specific surface area [21]. OC technique produces perfect crystals with moderate surface area, while the aggregation of fine particles in SG route gives the smallest surface area among the three samples.…”

A direct carbon fuel cell with (molten carbonate)/(doped ceria) composite electrolyte

“…A solid composite electrolyte composed of a molten salt phase, such as mixed hydroxides or carbonates, and an oxygen ion conducting porous solid phase, such as samarium doped ceria (SDC) has been used in solid oxide fuel cells (SOFCs) [16,[21][22][23][24][25]. The conductivity of this kind of composite electrolyte in an intermediate temperature (IT, 400-700 • C) range is much higher than the conventional solid electrolyte used in SOFC [26] and the molten electrolyte in molten carbonate fuel cell (MCFC).…”

Oxidation and Electrical Behavior of a Ferritic Stainless Steel with a Mn–Co-Based Coating for SOFC Interconnect Applications

“…In Fig. 6b, peaks of Mn, Cr, and O confirm the formation of (Mn,Cr) 3 The total scale layer for coated sample was *11 lm (Fig. 7a).…”