Abstract
In this study, we fabricated a thickness-controllable double-layer electrolyte to prevent peel-off among the anode, and cathode functional layers, and electrolyte layer generated during the sintering process in the fabrication of solid oxide fuel cell using the roll-to-roll additive manufacturing process. The peel-off could be generated by the difference of coefficient of thermal expansions (CTEs) of the component layers of SOFC. Gadolinium-doped ceria (GDC) is a ceramic electrolyte of which CTE is closer to the mixture of lanthanum strontium cobalt ferrite and gadolinium-doped ceria (LSCF-GDC), the cathode functional layer in this study, than yttrium-Stabilized zirconia (YSZ), the electrolyte layer. By embedding a thin GDC layer between LSCF-GDC and YSZ, the peel-off due to the thermal deformation can be prevented. Using the visco-capillary model, mass conservation law, and wettability of coated solution, we have determined the range of coating conditions for forming a stable coating bead. We coated a high-quality double-layer electrolyte of which component layer thicknesses can be controllable using a pilot-scale roll-to-roll slot-die coating process. The study can be useful to determine the coating conditions in the roll-to-roll process, i.e., coating gap, web speed, and flow rate, for thickness-controllable high-quality multi-layer coating without time and cost consumptive trial-and-error procedure.
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Acknowledgements
This work was supported by the Energy Efficiency & Resources of the Korea Insitute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Knowledge Economy (No. 20173010032140).
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Lee, J., Byeon, J. & Lee, C. Fabrication of Thickness-Controllable Double Layer Electrolyte Using Roll-to-Roll Additive Manufacturing System. Int. J. of Precis. Eng. and Manuf.-Green Tech. 7, 635–642 (2020). https://doi.org/10.1007/s40684-020-00200-y
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DOI: https://doi.org/10.1007/s40684-020-00200-y