| 학회 | 한국재료학회 |
| 학술대회 | 2007년 봄 (05/10 ~ 05/11, 무주리조트) |
| 권호 | 13권 1호 |
| 발표분야 | 에너지 환경재료 |
| 제목 | Surface Additives for Enhanced Electrode Performance in Medium Temperature Operating Solid Oxide Fuel Cells |
| 초록 | Recently, many efforts have been devoted to the development of solid oxide fuel cells (SOFCs) since in principle their energy conversion efficiency is fairly high. At present, the operating temperature of SOFC is restricted to very high temperatures of about 1000℃ because of the low ionic conductivity of yttria-stabilized zirconia (YSZ) solid electrolytes. Since high temperature operations cause many serious problems such as physical and chemical degradation of the construction materials and limits the choice of the materials for SOFCs, it is desirable to develop SOFCs operating at a medium temperature around 800℃. In order to reduce the ohmic loss of the solid electrolytes for medium temperature operation of a SOFC, methods of fabricating thin film zirconia electrolyte or syntheses of various novel solid electrolytes with a higher ionic conductivity have been investigated. However, these approaches may not be enough to get practical cell performances because the electrode reaction rates at the anode or cathode decrease with lowering temperature. In our experience the performance of the nickel-yttria stabilized zirconia (Ni-YSZ) anode in thin-film SOFCs were excellent over a broad temperature range. However, the cathode overpotential can be limiting, particularly at temperature below 800℃. Therefore, it is important to develop methods that promote the electrochemical reaction at medium temperature. In the present study we propose such a new method, which utilizes surface additives for enhanced cathode performance, and show some of the results that were obtained. |
| 저자 | 이영기, 이유기 |
| 소속 | 위덕대 |
| 키워드 | surface additives; electrode performance; SOFC |
