중ㆍ저온형 SOFC를 위한 Ni-YSZ 연료극 지지체형 단전지 미세구조와 전기적 특성

One of the main issues of Solid Oxide Fuel Cells (SOFCs) is to reduce the operating temperature to 750℃ or less. It has advantages of improving the life of component parts and the long-term stability of a system, so the production cost could be decreased. In order to achieve that, the ohmic and polarization loss of a single cell should be minimized first. This paper presents to fabricate anodesupported single cells with controlling microstructure as a function of particle size and volume of graphite and NiO-YSZ weight ratio. By means of optimizing the manufactural condition through microstructure analysis and performance evaluation, the single cell which had NiO-YSZ=6:4, graphite volume of 24% and graphite size of 75 ㎛ as the anode composition showed a distinguished power density of 510 ㎽/㎠ at 650℃ and 810 ㎽/㎠ at 700℃, respectively.