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| Home > Publications database > Fabrication and upscaling of anode supported proton conducting ceramic cells in planar design |
| Home > Publications database > Fabrication and upscaling of anode supported proton conducting ceramic cells in planar design |
| Conference Presentation (After Call) | FZJ-2021-05342 |
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2021
Abstract: Protonic ceramic fuel cells offer a high potential to produce electrical energy in a very efficient way. The performance of such devices is highly dependent on the electrolyte material and its thickness. In this work half-cell assemblies, consisting of Ba1.015Zr0.625Ce0.2Y0.175O3-δ electrolyte layer (final thickness ≤ 15 µm) supported on much thicker porous cermet Ba1.015Zr0.625Ce0.2Y0.175O3-δ:Ni anode (final thickness 350-700 µm), were developed via the inverse tape casting processing technique. Powders were prepared by the solid state reactive sintering and NiO was added to the electrolyte powder sintering aid facilitating sintering. The chemical composition and the physical characteristics of the starting powders were thoroughly analyzed and by need, adjusted to the tape casting fabrication process. The shrinkage rates of electrolyte and anode substrate single layers, as well as of the assemblies thereof were explored by optical dilatometry in order to optimise the de-binding and sintering procedures. Sintering experiments carried out at different heating regimes showed that to achieve the desired half-cell microstructure, including electrolyte gas tightness and flat reproducible geometry of the assemblies, sintering temperature of 1450°C was optimally required. The influence of the processing and sintering parameters on the final cell microstructure was investigated in details by XRD and SEM-EDX studies. The formation of BaY2NiO5 transient liquid phase during the sintering was confirmed. The tape-cast cells were electrochemically characterized after anode support reduction and the proton conductivity of the electrolyte was 0.003 S/cm at 600°C, which is comparable to the literature data. Finally, half-cell assemblies were successfully scaled-up to 25 cm2 area. Finally, this work demonstrates two key results: (i) the combination of tape casting and reactive sintering is able to produce large-area electrolyte-anode assemblies for a comparably low Ce content of 20 mol.% and ii) the achieved total proton conductivity is suitable for PCFC application.
Keyword(s): Energy (1st) ; Materials Science (2nd)
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