在中溫型固態氧化物燃料電池發展，多元素摻雜的材料在傳統爐高溫熱燒結的環境產生嚴重的元素擴散與偏析的問題。本研究應用自行發展的混合微波燒結技術來降低鈷基鈣鈦礦結構電極與氧化鈰基電解質燒結溫度，以交流阻抗頻譜分析技術檢視電解質與電極之界面活性，探討微波對材料結構與離子導電行為、微觀結構及催化性之相關性，改良傳統試片需於1,100℃燒結持溫2小時至微波燒結溫度1,000℃、1小時，並擁有較低的阻抗值。
為進一步降低中溫型固態氧化物燃料電池工作溫度至650℃以下，本實驗製作不同佔比之釔安定氧化鉍複合銀電極，以網印的方式塗佈在電解質兩側形成半電池，陶瓷離子導體與金屬電子導體呈現網絡狀連續均勻地分布，極化阻抗結果說明複合陰極之設計添加釔安定氧化鉍含量可以最佳化，從交流阻抗圖中的極化電阻結果指出，添加共摻雜釤釔安定氧化鉍複合銀電極在650℃下擁有較低的極化電阻(0.16 Ω．cm2)，較常用陰極更低之界面極化損失。
在異質結構中，兩種不同的材料會因為晶格匹配度的差異而產生應力，倘若晶格失配產生拉伸應力場，張應力之界面及存在於界面間的空間電荷區域(space charge region)能提供高移動率及巨量的載子，將有助於離子導電率的提升。本研究以磁控濺鍍技術，分別製作出30nm、70nm及100nm的釔安定氧化鋯(YSZ)薄膜於矽基板，觀察薄膜的型態其結構為柱狀晶，表面緻密且無孔洞之立方晶8YSZ。在YSZ平行矽基板界面方向所產生的巨離子導電效應中，30nm試片在125℃的低溫下就開始產生效應，結果顯示薄膜與基板生成的空間電荷區確實會影響電子與離子傳輸導通的能力。
經摻雜的氧化鈰雖然有優異的離子導電性，但最大的缺點就是高溫時容易有還原的問題，本實驗利用YSZ純氧離子導體的性質，製備具有空間電荷區及晶格失配的奈米YSZ薄膜複合電解質，結果顯示複合電解質的性能優於單層電解質，濺鍍100nm YSZ薄膜複合電解質之設計降低氧化鈰基電解質的阻抗及導電度。

In this study, the electrode kinetics of the oxygen reduction reaction at the cathode of solid oxide fuel cells are investigated using electrochemical impedance spectroscopy. Microwave sintering is associated with faster kinetics compared with conventional sintering. As a result, the microwave-sintered cells exhibit more porous structures, lower polarization resistances, and higher exchange current densities at lower operating temperatures.
Several silver-bismuth oxide composite cathodes were synthesized by a conventional oxide mixing fabrication process. The cathode mixtures consisting of 50 vol%–70 vol% Ag exhibited much lower overpotentials and higher exchange current densities than (La, Sr)(Co, Fe)O3–δ (LSCF) perovskite cathodes below 650 °C. The area specific resistance of the Ag–40 vol% Y0.5Bi1.5O3 cathode decreased to 0.16 Ω．cm2 at 650 °C. The cathode mixtures consisting of Ag–Bi1.5Y0.3Sm0.2O3 or Ag–Y0.5Bi1.5O3 exhibited lower overpotentials and higher exchange current densities than commercial Ag paste and perovskite cathodes. Favorable oxygen reduction reaction properties and lower activation energies were observed when the cell was operated at temperatures near 600 °C, which was an ideal operating temperature range for energy integration of solid oxide fuel cells as part of next generation triple combined cycle.
In the case of the deposition of YSZ on a Si substrate, interfaces that can be classified into homogeneous phase interfaces and heterogeneous phase interfaces were formed. A colossal ionic conductivity of YSZ film at temperatures higher than 125 °C was observed parallel to the interface. The total ionic conductivity of YSZ thin film is increased significantly in comparison to the bulk YSZ electrolyte.
By decreasing the YSZ electrolyte thickness and the electrode−electrolyte interfacial resistances, the operating temperature can be further reduced by using higher ionic conductivity GDCSr electrolyte at 650 °C or lower temperatures. The current results demonstrated that application of a thin YSZ protective layer to the GDCSr electrolyte for IT−SOFC not only enhanced oxygen−ion conduction but also provide a pathway for a faster ionic conduction.

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