Cathode-supported micro-tubular SOFCs based on Nd_1.95NiO_4 + δ: Fabrication and characterisation of dip-coated electrolyte layers

Henning Luebbe (1) , Jan van Herle (1) , Heinrich Hofmann (2) , Paul Bowen (2) , Ulrich Aschauer (2) , Frans Snijkers (3) , Hans-Juergen Schindler (4) , Ulrich Vogt (4) , Cécile Lalanne (5)

1 LENI - Laboratory of Industrial Energy Systems
2 Powder Technology Laboratory
3 VITO - Vlaamse Instelling voor Technologisch Onderzoek [Mol]
4 Eidgenössische Materialprüfanstalt EMPA
5 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

Fabrication conditions to obtain dense electrolyte double layers on a porous micro-tubular cathode substrate were investigated. Porous tubes of a nickelate material, Nd_1.95NiO_4 + δ, were fabricated by cold-isostatic pressing (CIP) and sintering. Thin films of electrolyte powders Ce_0.9Gd_0.1O_1.95 (GDC) and Zr_0.89Sc_0.1Ce_0.01O_1.95 (SSZ) were applied by dip-coating in aqueous suspensions. Electrolyte powders had been attrition-milled to decrease their particle size and densification temperature. The quantity of polyacrylic acid (PAA) as dispersant was optimised by ζ-potential measurements. The densification behaviour was studied by dilatometry and SEM-imaging. A sintering temperature of 1250 °C was found to densify GDC whereas SSZ-layers remained slightly porous.

Mots clés: Micro-tubular SOFC; Cathode-supported cell (CSC); Nickelate oxide; Colloidal stability; Cosintering

Domaines: Matériaux

Henning Luebbe, Jan van Herle, Heinrich Hofmann, Paul Bowen, Ulrich Aschauer, et al.. Cathode-supported micro-tubular SOFCs based on Nd_1.95NiO_4 + δ: Fabrication and characterisation of dip-coated electrolyte layers. Solid State Ionics, 2009, 180 (11-13), pp.805-811. ⟨10.1016/j.ssi.2009.01.010⟩. ⟨hal-00401253⟩