本研究主要探討不同鉀摻雜濃度對鍶鈰釔氧化物(Sr1-xKxCe0.95Y0.05O3, x=0, 0.025, 0.05)導電率與化學穩定性的影響。利用固態反應法製備混合質子-電子導體之Sr1-xKxCe0.95Y0.05O3鈣鈦礦結構，利用X光粉末繞射儀(XRD)分析材料結構與相鑑定，微結構使用場發掃描式電子顯微鏡(FE-SEM)來做觀察。兩點式電阻量測法量測材料在550℃~900℃之乾氫氣、濕氫氣與大氣氣氛下之導電性，並透過Arrhenius方程式計算其活化能；化學穩定性則在CO2氣氛處理下進行。XRD結果顯示，經1250°C煆燒12小時後可獲得單一鈣鈦礦結構，並無其他雜相生成。在導電率方面，所有氣氛下鍶鈰釔氧化物導電率均隨著鉀摻雜濃度增加而提升。在CO2化學穩定性實驗中，材料化學穩定性隨鉀摻雜含量增加而下降。 The effect of Potassium doped in SrCe0.95Y0.05O3 on conductivity and chemical stability were investigated in this study. Sr1-xKxCe0.95Y0.05O3, (x=0, 0.05, 0.1, 0.15) was prepared by solid state reaction. The crystal structure, phase and microstructures were identified using X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM). Electrical conductivity were measured in dry, moist hydrogen and air at 550℃ to 900℃ by two-point probe method. The activation energy was calculated by Arrhenius equation. Chemical stability were examined under CO2 atmosphere. Preliminary results from XRD showed pure perovskite structure and no detectable impurity phases when powders were calcined at 1250℃ for 12 hours. The electrical conductivity increased as concentration of doped Y increased. The chemical stability under CO2 was lose significantly as more Y was doped into strontium cerates.
