Multilayer and Co-sintering Ni/8YSZ for SOFC by Aqueous Tape Casting

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Colleges, School and Institutes

Abstract

Ni/8YSZ SOFC half-cell consisting of electrolyte, anode functional layer and anode substrate were successfully fabricated using a multilayer aqueous tape casting route and co-sintering between the layer application. Zeta potential and sedimentation tests were carried out prior to the slurry optimisation. The optimisation and conditioning focused on the anode substrate since the thick cast substrates show more problems with cracking and pinholes. For the substrate, the cermet powders were mixed with distilled water, PAA,
PVA, PEG, glycerol, antifoam 204 and tapioca starch in the roles of solvent, dispersant, binder, plasticisers, antifoam agent, and pore former, respectively. For thick slurries, degassing followed by slow rolling was essential to avoid pin-holes and keep the slurry homogenous during storage. Drying at constant humidity as well as the amount of organics used was found to be very critical to avoid cracking. The smooth multi-layered green tapes produced were cut into button cell size and co-sintered at 1350°C without presintering during intermediate steps and the half-cell then characterised by Scanning
Electron Microscopy (SEM).

Details

Original languageEnglish
Title of host publicationProceedings of the 12th European SOFC Forum
Publication statusPublished - 5 Jul 2016
Event12th European SOFC Forum 2016 - KKL, Lucerne, Switzerland
Duration: 5 Jul 20168 Jul 2016
http://www.efcf.com

Conference

Conference12th European SOFC Forum 2016
CountrySwitzerland
CityLucerne
Period5/07/168/07/16
Internet address