Scaling up aqueous processing of A-site deficient strontium titanate for SOFC anode supports

Abstract

All ceramic anode supported half cells of technically relevant scale were fabricated in this study, using a novel strontium titanate anode material. The use of this material would be highly advantageous in solid oxide fuel cells due to its redox tolerance and resistance to coking and sulphur poisoning. Successful fabrication was possible through aqueous tape casting of both anode support and electrolyte layers and subsequent lamination. Screen printing of electrolyte layers onto green anode tapes was also attempted but resulted in cracked electrolyte layers upon firing. Microstructural, electrical and mechanical properties of anode supports and half cells will be discussed. The use of two different commercial titanate powders with nominal identical, but in reality different stoichiometries, strongly affect electrical and mechanical properties. Careful consideration of such variations between powder suppliers, and batches of the same supplier, is critical for the successful implementation of ceramic anode supported solid oxide fuel cells.

Tailoring SOFC Electrode Microstructures for Improved Performance

“…[187] Anode supported half cells were successfully manufactured by aqueous tape casting and infiltration, where LSCT A− was the supporting scaffold for infiltration with different types of ceria impregnated. [187] Anode supported half cells were successfully manufactured by aqueous tape casting and infiltration, where LSCT A− was the supporting scaffold for infiltration with different types of ceria impregnated.…”

“…An attempt to transfer developed ceramic formulations and methods in the lab to an industrial relevant level with novel ceramic materials has been reported recently on aqueous tape casting and subsequent infiltration . Anode supported half cells were successfully manufactured by aqueous tape casting and infiltration, where LSCT A− was the supporting scaffold for infiltration with different types of ceria impregnated.…”

Optimization of La0.2Sr0.7–xCaxTi0.95Fe0.05O3−δ Fuel Electrode Stoichiometry for Solid Oxide Fuel-Cell Application

“…A typical SOFC fuel electrode material that displays outstanding catalytic performance in hydrogen is Ni-cermet. − However, this electrode is not very stable and attractive in hydrocarbon fuels because of its quick carbon deposition at operating temperatures and the necessity for a high water concentration in the fuel stream to suppress the carbon deposition (which leads to decrease of the SOFC power characteristics). − Additionally, Ni-based fuel electrodes are very sensitive against impurities like H 2 S in natural gas and HCl, as well as KCl in syngas, ,,− and tend to re-oxidize at higher cell loads. A large number of studies has been devoted to diminishing these drawbacks by exploring new materials to replace the Ni-cermet fuel electrode. ,, One attractive branch of novel electrode materials is perovskite-type complex oxides (ABO 3 ) with mixed ionic–electronic conductivity (MIEC).…”

Material and method selection for efficient solid oxide fuel cell anode: Recent advancements and reviews

“…La 0.20 Sr 0.25 Ca 0.45 TiO 3 (LSCT) was synthesized using this method, and its scanning electron microscope (SEM) micrograph is shown in Figure where black areas are pores and the regions that are darker having grey colour can be seen as secondary phase, ie, rutile. The particle size could be controlled by changing calcination temperatures . (2) Ultrasonic spray pyrolysis: MWs are used and adjusting the frequency one can control the size of drops .…”

“…The particle size could be controlled by changing calcination temperatures. 149 (2) Ultrasonic spray pyrolysis: MWs are used and adjusting the frequency one can control the size of drops. 150 (3) Flame spray pyrolysis is accomplished in three steps: firstly, aerosol production takes place; then, combustion is done, and finally, powder is collected.…”