We are continuing a national project to develop 1 kW-class SOFC system for Residential Power Generation (RPG) application supported by Korean Government. For intermediate temperature operation, we chose anode-supported, planar type SOFC design 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 or ScSZ, respectively, were fabricated and their small stacks were built and evaluated. The size of anode-supported single cells finally sintered was about 10 × 10 cm2, and the thickness of electrolyte and the cathode layer was about 20μm and 30μm, respectively. The I-V and AC impedance characteristics of these single cells and small stacks were evaluated at intermediate temperature (650 ∼ 800°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 33,000 h (3.8 years) at 750°C, applying 0.76 V with power density of 200 mW/cm2. Using these YSZ thin electrolyte 10 × 10 cm2 cells and Inconel interconnect plates coated by silver paste, the 15-cell and 60-cell short stack were prepared. The initial stack 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 operation time. It was then stabilized until 4,000 h with a degradation rate of 10 mV/(1000h, 1 cell). AC impedance of this small stack and microstructure of cell components were analyzed during and after the operation. Furthermore ScSZ thin electrolyte 10 × 10 cm2 cells and ferritic stainless steel interconnects were built into a 5-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 gas or methane gas as fuel.
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ASME 2005 3rd International Conference on Fuel Cell Science, Engineering and Technology
May 23–25, 2005
Ypsilanti, Michigan, USA
Conference Sponsors:
- Nanotechnology Institute
ISBN:
0-7918-3764-5
PROCEEDINGS PAPER
Stack Performance of Intermediate Temperature-Operating Solid Oxide Fuel Cells Using Stainless Steel Interconnects and Anode-Supported Single Cells Available to Purchase
Joongmyeon Bae,
Joongmyeon Bae
Korea Advanced Institute of Science and Technology, Daejeon, Korea
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Jae Keun Park,
Jae Keun Park
Korea Electric Power Research Institute, Daejeon, Korea
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Jin-Woo Park,
Jin-Woo Park
Korea Electric Power Research Institute, Daejeon, Korea
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Hee-Chun Lim,
Hee-Chun Lim
Korea Electric Power Research Institute, Daejeon, Korea
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Youngsung Yoo
Youngsung Yoo
Korea Electric Power Research Institute, Daejeon, Korea
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Joongmyeon Bae
Korea Advanced Institute of Science and Technology, Daejeon, Korea
Jae Keun Park
Korea Electric Power Research Institute, Daejeon, Korea
Jin-Woo Park
Korea Electric Power Research Institute, Daejeon, Korea
Hee-Chun Lim
Korea Electric Power Research Institute, Daejeon, Korea
Youngsung Yoo
Korea Electric Power Research Institute, Daejeon, Korea
Paper No:
FUELCELL2005-74145, pp. 299-303; 5 pages
Published Online:
October 13, 2008
Citation
Bae, J, Park, JK, Park, J, Lim, H, & Yoo, Y. "Stack Performance of Intermediate Temperature-Operating Solid Oxide Fuel Cells Using Stainless Steel Interconnects and Anode-Supported Single Cells." Proceedings of the ASME 2005 3rd International Conference on Fuel Cell Science, Engineering and Technology. 3rd International Conference on Fuel Cell Science, Engineering and Technology. Ypsilanti, Michigan, USA. May 23–25, 2005. pp. 299-303. ASME. https://doi.org/10.1115/FUELCELL2005-74145
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