Modified Oxalate Method 의해 합성한 SOFC용(La0.6Sr0.4)(Co0.2Fe0.8)O3 Cathode의 pH 변화에 따른 특성
Synthesis and Electrochemical Properties of (La0.6Sr0.4)(Co0.2Fe0.8)O3 Cathode for SOFC on pH Control Using Modified Oxalate Method
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Abstract
The LSCF cathode for Solid Oxide Fuel Cell was investigated to develop high performancepH. The LSCF powders employed La, Sr, Co and Fe oxides, oxalic acid, ethanol and NH4OH solutionwere synthesized with pH controlled as 2, 6, 7, 8, 9 and 10 at 80oC Single crystaline phase was obtainedfrom pH 2~9. on the other hand, La2O3 appeared from pH 10. Very fine powder with particle size of50 nm was obtained at calcination temperature of 800oC for 4 hours. LSCF cathode synthesized at pH7 showed the highest electric conductivity in the temperature range of 60oC to 900oC its value was950 S/cm at 900oC Under same synthesis conditions, polarization resistance of each LSCF cathode waschanged with diferent calcination temperatures. As-prepared powder presented 2.52, 1.54 and 2.58Ω at600oC with ScSZ, 8Y-YSZ and GDC as its electrolyte respectively after calcination at 800oC for 4 hours.
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