| 혼합전도체 LSCF(La0.6Sr0.4Co0.2Fe0.8O3) 양극의 기공률에 따른 음극지지형 단전지의 출력특성 평가 |
| 윤중철, 김우식1, 김형철1, 이종호1, 김주선1, 이해원1, 김병호2 |
고려대학교 재료공학과, 한국과학기술연구원 나노재료연구센터
1한국과학기술연구원 나노재료연구센터
2고려대학교 재료공학과 |
| Effect of Cathode Porosity of Mixed Conducting (La0.6Sr0.4Co0.2Fe0.8O3) on the Power Generating Characteristics of Anode Supported SOFCs |
| Joong-Cheul Yun, Woo-Sik Kim1, Hyoungchul Kim1, Jong-Ho Lee1, Joosun Kim1, Hae-Weon Lee1, Byong-Ho Kim2 |
Department of Materials Science and Engineering, Korea University, Nano-Materials Research Center, KIST
1Nano-Materials Research Center, KIST
2Department of Materials Science and Engineering, Korea University |
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| ABSTRACT |
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We analyzed the unit cell performance against the cathode porosity, which is supposed to be closely related with active sites for the cathode reaction. In order to fabricate the unit cells with different porosity in the cathode layer we changed the mixing ratio of fine and coarse LSCF cathode powders. The final porosity of each cathode layer was 14, 23, 27, $39%$ respectively. According to the electrochemical analysis of unit cell performance via DC current interruption and AC impedance method, the electrodic polarization resistance was diminished as the cathode porosity increased. The decrease of polarization resistance was attributed due to the increase of active reaction sites and the enhancement of overall unit cell performance could be explained in the same line. |
| Key words:
SOFC, Mixed conducting cathode, LSCF, Unit cell performance, Polarization |
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