| LSGM 전해질과 LSM 양극의 합성분말을 이용한 SOFC 단위전지의 특성 |
| 이미재, 남중희, 최병현 |
| 요업기술원 신기능재료연구부 |
| Cell Properties for SOFC Using Synthesized Powder of Electrolyte LSGM System and Cathode LSM System |
| Mi-Jai Lee, Jeong-Hee Nam, Byung-Hyun Choi |
| Division of Advanced Functional Materials Research, Korea Institute of Ceramic Engineering and Technology |
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| ABSTRACT |
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The purpose of this study is to investigate the properties of LSGM electrolyte and LSM cathode. The unit cell based on the optimum conditions and processing for high performance was fabricated and measured. The single phase of $LaGaO_3$ was obtained on sintering at $1500^{circ}$ for 6h with composition of $(La_{0.85}Sr_{0.15})(Ga_{0.8}Mg_{0.2})O_{3-delta}와 (La_{0.8}Sr_{0.2})(Ga_{0.8}Mg_{0.2})O_{3-delta}$ and $(La_{0.85}Sr_{0.15})(Ga_{0.8}Mg_{0.2})O_{3-delta}$. The grain size of the sintered body was about $10∼30{mu}m$ and electrical conductivity was 0.13 S/cm measured at $800^{circ}$. The single phase of $LaMnO_3$ structure in $(La1-xSrx)MnO_3$ system was obtained at x=0∼0.2 and the particle size of the synthesized powder was about 40 nm. The unit cell was prepared by firing at $1200^{circ}$ for 1h with $(La_{0.9}Sr_{0.1})MnO_3$ cathode and 0.9NiO-0.1YSZ anode screen-printed on surfaces of $(La_{0.8}Sr_{0.2})(Ga_{0.8}Mg_{0.2})O_{3-delta}$ electrolyte. The grain size of the electrode was close to $1{mu}m$ and the electrode had porous structure. The maximum power density of unit cell showed $0.3W/cm^2$ at $800^{circ}$. |
| Key words:
$(La_{1-x}Sr_x)(Ga_{1-y}Mg_y)O_{3-\delta}$, Electrolyte, Perovskite, SOFC |
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