Recently we have started a project to develop 1 kW-class SOFC system for Residential Power Generation (RPG) application supported by Korean Government. For a 1 kW-class SOFC stack that can be operated at intermediate temperatures, we started to develop anode-supported, planar type SOFC to have advantages for commercialization of SOFCs considering mass production and using cost-effective interconnects such as ferritic stainless steels. Anode-supported single cells with thin electrolyte layer of YSZ were fabricated and their small stacks were built and evaluated. The size of anode-supported single cells after final sintering was about 5 × 5 cm2, and the thickness of electrolyte and the cathode layer were about 20 μm and 30 μm, respectively. I-V and AC impedance characteristics of these single cells and small stacks were evaluated at intermediate temperature (650 ∼ 750°C) by using hydrogen gas as a fuel. We have already carried out long-term performance test for YSZ thin electrolyte single cell for above 26,000 h (3 years) at 750°C, applying 0.76 V with power density of 200 mW/cm2. Using these YSZ thin electrolyte 5 × 5 cm2 cells and Inconel interconnect plates coated by silver paste, the 15-cell and 60-cell short stack were prepared. The initial stack (15 cell) voltage at 150 mW/cm2 was 12.5 V in hydrogen as fuel of 120 sccm/cell at 750°C and decreased to about 10.9 V at 500 h of operation time. It was then stabilized and kept until 4,000 h with a degradation rate of 10 mV/(1000 h, 1 cell). AC impedance of this small stack and microstructure of cell components were analyzed during and after the operation. Furthermore thin electrolyte cells and ferritic stainless steel interconnects were built into a 4-cell stack and the small stack was operated at 650°C for cost-effective planar SOFC RPG system. I-V and AC impedance characteristics of the small stack were evaluated at 650°C by using hydrogen as a fuel.
- Nanotechnology Institute
Performance of Small Stack for Intermediate Temperature-Operating Solid Oxide Fuel Cells Using Stainless Steel Interconnects
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Bae, J, Park, JW, Lim, HC, Ahn, K, & Yoo, Y. "Performance of Small Stack for Intermediate Temperature-Operating Solid Oxide Fuel Cells Using Stainless Steel Interconnects." Proceedings of the ASME 2004 2nd International Conference on Fuel Cell Science, Engineering and Technology. 2nd International Conference on Fuel Cell Science, Engineering and Technology. Rochester, New York, USA. June 14–16, 2004. pp. 49-52. ASME. https://doi.org/10.1115/FUELCELL2004-2451
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