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Research Papers

Fabrication and Demonstration of 1 kW Class SOFC Stack and System for Residential Power Generation Application

[+] Author and Article Information
Young-Sung Yoo

 Korea Electric Power Research Institute (KEPRI), 103-16 Munji-Dong, Yuseong-Gu, Daejeon 305-380, Koreayungsung@kepri.re.kr

Taehee Lee, Jin Hyeok Choi, Tae-Sung Park, Je-Myung Oh, Chong-Young Kim

 Korea Electric Power Research Institute (KEPRI), 103-16 Munji-Dong, Yuseong-Gu, Daejeon 305-380, Korea

J. Fuel Cell Sci. Technol 6(2), 021008 (Feb 24, 2009) (5 pages) doi:10.1115/1.2971129 History: Received June 14, 2007; Revised April 01, 2008; Published February 24, 2009

The planar type 1 kW class solid oxide fuel cell (SOFC) stack using metallic interconnects such as ferritic stainless steel has been developed for application in a residential power generation system. For the intermediate temperature operation of the SOFC, a higher performance of anode-supported single cells of 10×10cm2 with a thin electrolyte layer of yttria-stabilized zirconia were fabricated by slurry coating, and their performances were improved by a microstructure-controlled anode substrate and by introducing alternative cathode materials. The thicknesses of the electrolyte and the cathode layers were about 20μm and 40μm, respectively. I-V and ac impedance characteristics of single cells were evaluated at an intermediate temperature (650800°C) by using hydrogen gas as fuel. The maximum power density of the 10×10cm2 anode-supported cells was about 0.32W/cm2 at 750°C and 0.2W/cm2 at 650°C. In this work a 1 kW class SOFC stack composed of 37 cells (10×10cm2) was successfully manufactured and a SOFC system with balance of plant (BOP) (reformer, heat exchanger, catalytic burner, etc.) integrated for combined heat and power. The system designed for power generation by using a natural gas as fuel can concurrently produce electricity at a SOFC stack and hot water from recuperating heat. The system showed a maximum dc output of 1.3kWe. Detailed status and experimental results of the 1 kW SOFC system will be discussed in this paper.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Anode-supported single cells (5×5 cm2, 10×10 cm2, and 15×15 cm2) developed in this work

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Figure 2

Cross section view of single cells composed of (a) the LSCF/YSZ/(Ni-YSZ) normal cell and (b) the LSCF/YSZ/FL(Ni-YSZ) functional layered cell in the anode

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Figure 3

Performance of four-cell short stack built-up with 10×10 cm2 single cells of LSCF/YSZ/FL(Ni-YSZ)

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Figure 4

1 kW class 37 cell stack

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Figure 6

BOPs of the 1 kW SOFC system (10)

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Figure 8

1 kW class 50 cell stack (second generation, under installation)

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Figure 5

1 kW SOFC system for demonstration (10)

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Figure 7

I-V-P output of 37 cell stack (10×10 cm2 area per cell) at 750°C operated with the reformate gas of city gas (10)

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