本研究主旨為以低溫水熱法合成中低溫(500~700℃)Ce0.8Bi0.2-xMxO1.9(M=Sm、Er、Dy)SOFC電解質，以取代傳統YSZ( ytria stabled zirconia )材料，並藉由研究其晶體結構、摻雜後的氧空洞變化、導電率和活化能。在所有摻雜組成 以Ce0.8Bi0.05Sm0.15O1.9在700 ℃的離子導電率最高，約為5.21×10-2 Scm-1，此時活化能為0.6891 eV，由實驗的結果來看，以交流阻抗量測摻雜異質不等價金屬離子的CeO2系電解質是可以有效提升離子導電度(純CeO2在900℃離子導電率7.37×10-4 Scm-1)，但是對於摻雜異價金屬於CeO2所產生的氧缺陷不是這麼明朗，為了更加瞭解氧缺陷對離子導電度的貢獻，吾人以在不同燒結溫度Ce0.8Bi0.05Sm0.15O1.9電解質進行拉曼散射光譜分析，以F2g band 和oxygen vacancy band 的比值(I462/I550)視為氧空洞濃度的強弱，隨燒結溫度而提升，I462/I550比值就為之提升， 燒結溫度的改變，不只是改變了氧空洞濃度的強弱，也對錠片的緻密性有很大的影響，综合各個考量下，在燒結溫度1300 ℃得最佳的離子導電度。
由晶體結構、拉曼分析與阻抗分析的結果來看，本研究已成功地以低溫水熱法來合成奈米級、共摻雜異質不等價的金屬離子的CeO2系的電解質，但為了將來可配合電泳沉積(electrophoresis deposition，EPD)技術，製造以電極為基材的電解質薄膜，吾人先研究其反應機制，以求更了解整個電泳沉積中，電荷的來源，以利將來電泳沉積的研究。在經過紫外光可見光譜儀(UV/vis)、傅立葉轉換紅外光光譜儀(FTIR)、拉曼散射光譜儀(Raman)、固態核磁共振儀(NMR)之分析後，建立其反應機制，因碘加入有機溶劑時，會造成pH值的變化，隨著反應時間增加，溶液的pH值會逐漸上升，此時溶液反應生成I-離子及I3-離子，殘存的碘逐漸反應完，最後溶液只剩I-，所以吾人視pH值跟I3-離子為碘與有機溶劑反應是否完全的指標。

The aim of this study is to develop a low temperature hydrothermal method in synthesizing Ce0.8Bi0.2-xMxO1.9(M=Sm,Er,Dy) solid electrolytes, which is operating at intermediate temperatures (500 ℃-700 ℃) for solid oxide fuel cells (SOFC). The traditional YSZ-based solid electrolytes show very low ionic conductivities during this temperature range and research on the development of solid electrolytes alternative to YSZ is of great importance. The corresponding crystal structure, oxide ion vacancies, conductivity, and activation energy after dopants are thoroughly studied and discussed. Among the various dopants studied, Ce0.8Bi0.05Sm0.15O1.9 exhibited the highest conductivity of about 5.21×10-2 Scm-1 at 700 ℃ and the activation energy is found to be 0.6891 eV. By AC-Impedence, the improvement in ionic conductivity of ceria-based solid electrolyte (conductivity of pure ceria oxide at 900 ℃ is 7.37×10-4 Scm-1) with the amount of doping metal ion with different charges can be reasonably understood. We also investigated the variations in conductivity caused by oxide ion vacancies. With Raman scattering spectrum, we analyzed Ce0.8Bi0.05Sm0.15O1.9 at different sintering temperatures. From the results obtained from various analysis techniques, we found that 1300 ℃ is the best sintering temperature. The Ce0.8Bi0.05Sm0.15O1.9 sintered at 1300 ℃ exhibited promising density, oxide ion vacancies and conductivity.
Our future interest is to fabricate thin electrolyte film on the anode-supported intermediate temperature SOFC by electrophoresis deposition (EPD) method. As the charge of particle is an important factor which determines the efficacy of EPD process, herein we study the reaction mechanism of EPD. After following UV/Vis, FTIR, Raman, NMR during EPD process, we developed the reaction mechanism. As iodine is added into the organic solvent, the pH value of solution will increase gradually. During the course of reaction I- and I3- are formed. However, at the end of the reaction, there is only I- in the solution. These results indicate that both the pH and formation of I3- are dependent on the time of reaction between iodine and organic solvent.

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