Abstract
A simple gel-casting method was successfully combined with the spray-coating technique to manufacture graded anode-supported micro-tubular solid oxide fuel cells (MT-SOFCs) based on samaria-doped ceria (SDC) as an electrolyte. Micro-tubular anodes were shaped by a gel-casting method based on a new and simple forming technique that operates as a syringe. The aqueous slurry formulation of the NiO-SDC substrate using agarose as a gelling agent, and the effect of spray-coating parameters used to deposit the anode functional layers (AFLs) and electrolyte were investigated. Furthermore, pre-sintering temperature of anode substrates was systematically studied to avoid the anode-electrolyte delamination and obtain a dense electrolyte without cracks, after co-sintering process at 1450°C. Despite the high shrinkage of substrate (∼70%), an anode porosity of ∼37% was achieved. MT-SOFCs with ∼2.5 mm of outer diameter, 370 μm thick substrate, 20 μm thick AFLs and 15 μm thick electrolyte were successfully obtained. The use of AFLs with 30:70 and 50:50 wt% NiO-SDC allowed to obtain a continuous gradation of composition and porosity in the anode-electrolyte interface.
Original language | English |
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Pages (from-to) | 3713-3722 |
Number of pages | 10 |
Journal | Ceramics International |
Volume | 38 |
Issue number | 5 |
DOIs | |
Publication status | Published - Jul 2012 |
Keywords
- Doped ceria
- Gel-casting
- Graded anode
- Micro-tubular SOFC
- SOFC
- Spray-coating
ASJC Scopus subject areas
- Ceramics and Composites
- Process Chemistry and Technology
- Electronic, Optical and Magnetic Materials
- Surfaces, Coatings and Films
- Materials Chemistry