Development and Electrochemical Evaluation of Tape Cast Substrates for SOFC Single Cells
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As a means to reduce the solid oxide fuel cell material cost and make it more adapted to other fuels, titania as a candidate catalyst material has been investigated. A low-cost, high precision, self made tape casting system made it possible to fabricate thin films by the tape casting method. Substrates for SOFC single cells were manufactured through experimentation and optimization of slurry recipes for tape casting. The produced substrates were micro-structural analyzed by using an AFM, and evaluated with the use of EIS. The study shows that it is possible to fabricate standalone titania substrates. And the structural analysis and impedance spectroscopy implies that titania show desirable properties, such as amounts of porosity, good conductivity (in the order of 10−3 S/m) and low activation energy (0.21 eV). Still, the conductivity do not prove to be high enough, for working as the sole electronic conductor for the anode. Which is why it may be necessary to pair titania with a metallic conductor, such as copper, to reach satisfactory conductivity levels. Repeated tests are needed to further confirm the findings of this study. Further studies are also appropriate, for more extensive testing in the same track, but also to look at possible titania composites.
Masteroppgave fornybar energi- Universitetet i Agder, 2013