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Effect of Microstructure on Mechanical and Electrical Properties in Ni-YSZ of Anode Supported SOFC

연료극 지지체식 고체산화물 연료전지의 기계적 및 전기적 특성에 미치는 Ni-YSZ의 미세구조의 영향

  • 최미화 (한국전력공사 전력연구원 녹색성장연구소) ;
  • 최진혁 (한국전력공사 전력연구원 녹색성장연구소) ;
  • 이태희 (한국전력공사 전력연구원 녹색성장연구소) ;
  • 유영성 (한국전력공사 전력연구원 녹색성장연구소)
  • Received : 2011.09.08
  • Accepted : 2011.10.21
  • Published : 2011.10.30

Abstract

Electrode of solid oxide fuel cell must have sufficient porosity to allow gas transport to the interface with electrolyte effectively but high porosity has a negative impact on structural stability in electrode support. Thus, the upper limit of porosity is based on consideration of mechanical strength of electrode. In this study, the effect of microstructure of Ni-YSZ anode supported SOFC on the mechanical and electrical property was investigated. LSCF composite cathode and 8YSZ electrolyte were used. The porosity of the anode was modified by the amount of graphite powder and added graphite contents were 24, 18, 12 vol%, respectively. The higher the porosity, the better the electrical performance, $P_{max}$. While the flexural strength decreased with increasing the amount of graphite. But the rate of increase in electrical performance and the rate of decrease in mechanical strength were not directly proportional to amount of graphite. The optimum graphite content incorporating both electrical and mechanical performance was 18 vol%.

Acknowledgement

Grant : 5kW급 열병합 고체산화물 연료전지 발전시스템 개발

Supported by : 지식경제부

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