本研究探討改變鈰與鋯的比例，以研究不同鋯摻雜比例之鋇鈰釔氧化物微觀結構與電學特性之間的關係。本研究利用固相反應法成功製備BaCe0.8-xZrxY0.2O3-δ (BCZYx, x=0.1~0.5)電解質粉末，隨著Zr摻雜比例增加，鈣鈦礦主峰的XRD衍射角度增加，表明Zr成功摻雜至BaCeYO3樣品中。由SEM微觀結構顯示隨著鋯摻雜比例的增加，晶粒大小會隨之減小，此結果會造成鋇鈰氧化物之晶界長度增長，導致晶界阻抗增加。在質子傳導率的結果表明，隨著Zr比例的提升而增加，當Zr摻雜比例為0.3時，在700 oC會有最高之質子傳導率0.010 S/cm，但是當鋯摻雜比例為0.4之後傳導率則開始減少，此原因是由於載子濃度、晶體結構隨著Zr摻雜比例的不同，而有所變化。於加濕氫氣下傳導率結果表明，其趨勢與未加濕時一致，BCZY0.3在700 oC亦有最高之質子傳導率0.014 S/cm，此結果亦證明加濕氣氛可有助提升質子傳導率。本研究亦使用Electron back scattered diffraction (EBSD)鑑定其不同樣品之晶體結構，映像圖結果表明所有樣品皆顯示正交晶體具有最高之比例。此外，本研究利用不同粒徑粉末制備BCZY0.3電解質，從性能結果表明，隨著使用鋯珠尺寸減小，有助於提升電解質緻密性，並且使用1 mm鋯珠所製備之單電池於700 oC時量測到最高功率密度84 mW/cm2。;This study explores the relationship between the ratio of cerium and zirconium to study the relationship between the microstructure and electrical properties of barium cerium oxide with different zirconium doping ratios. In this study, BaCe0.8-xZrxY0.2O3-δ (BCZYx, x=0.1~0.5) electrolyte powder was successfully prepared by solid state reaction method. As the increase of Zr doping ratio, the XRD diffraction angle of the main peak of perovskite increased, indicating Zr successfully doped into the BaCeYO3. The SEM microstructure shows that as the Zr doping ratio increases, the grain size decreases, causing increase the grain boundary length of the barium cerium oxide, resulting in increase grain boundary impedance. The proton conductivity results show that as the Zr ratio increases, the highest proton conductivity is 0.010 S/cm at 700 °C when the Zr doping ratio is 0.3. But when the zirconium doping ratio increase to 0.4, the conductivity begins to decrease. The reason for this is because the carrier concentration and crystal structure vary with the Zr doping ratio. The conductivity results under humidified hydrogen show that the trend is consistent with that of non-humidification. BCZY0.3 also has the highest proton conductivity of 0.014 S/cm at 700 °C. This result also proves that the humidified atmosphere can enhance the proton conduction. In this study, Electron back scattered diffraction (EBSD) was also used to identify the crystal structure of different samples. The results of the mapping showed that all samples had the highest proportion of orthorhombic crystals. In addition, in this study, BCZY0.3 electrolyte was prepared by using different particle size powders. The performance results show that as the size of the zirconium beads used is reduced, it contributes to the improvement of electrolyte density, and the use of 1 mm zirconium beads of the electrolyte has a maximum power density of 84 mW/cm2 at 700 oC.
