Processing of graded anode-supported micro-tubular SOFCs based on samaria-doped ceria via gel-casting and spray-coating

M. Morales, Helena Navarro, X. G. Capdevila, J. J. Roa, M. Segarra

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

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 languageEnglish
Pages (from-to)3713-3722
Number of pages10
JournalCeramics International
Volume38
Issue number5
DOIs
Publication statusPublished - 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

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