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研究生: 王泰傑
Tai-Jie Wang
論文名稱: 以BaCe0.6Zr0.2Y0.2O3-δ為骨架浸潤La0.6Sr0.4Co0.8Fe0.2製備為複合陰極 應用於質子傳導型SOFC之可行性研究
La0.6Sr0.4Co0.8Fe0.2O3-δ cathodes deposited on BaCe0.6Zr0.2Y0.2O3-δ by infiltration for proton-conducting solid oxide fuel cells
指導教授: 林景崎
Jing-Chie Lin
口試委員:
學位類別: 碩士
Master
系所名稱: 工學院 - 材料科學與工程研究所
Graduate Institute of Materials Science & Engineering
論文出版年: 2022
畢業學年度: 110
語文別: 中文
論文頁數: 127
中文關鍵詞: 固態氧化物燃料電池P-SOFC浸潤法複合陰極電化學交流阻抗
外文關鍵詞: Composite cathodes, Electrochemical AC impedance spectroscopy
相關次數: 點閱:15下載:0
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  • 本研究使用固態反應法製備之電解質BCZY粉末,以濕行星式球磨將粒徑減小增加表面積作為陰極骨架材料,將三種不同燒結溫度作為變數個別為1000 ℃、1100 ℃、1200 ℃,製備出具有足夠孔隙率且與電解質連接性良好的BCZY陰極骨架,以最佳的燒結參數1100 ℃進行後續之浸潤實驗。浸潤溶液使用兩種配方進行比較,一為添加甘胺酸做為螯合劑並使用乙醇做為界面活性劑,為燃燒合成法之浸潤溶液配方,另一為使用乙二醇使前驅溶液脂化,烘乾後添加乙二醇單丁醚作為界面活性劑,以熔膠凝膠法之浸潤溶液配方,進行表面形貌、微觀結構以及孔隙率之探討,接著提升浸潤溶液負載量增加電化學活性位點,並獲得製備複合陰極之最佳負載量。
    經由I-V直流極化曲線和電化學交流阻抗頻譜進行深入分析,以瞭解不同陰極結構在質子傳輸型固態氧化物燃料電池中的反應差異,隨著浸潤含量的提升可以增加三相界面的反應面積,導致極化阻抗之下降,並且得知過度的添加會造成孔隙率的不足,使陰極端氧氣無法充分擴散,進行氧還原反應造成額外阻抗的產生。
    最佳效能參數為使用乙二醇浸潤溶液,負載量為55.8 wt.%之複合陰極,全電池於800 ℃下測得之效能:開路電壓為0.96 V、功率密度為388 mW/cm2。


    In this study, the electrolyte BCZY powder prepared by the solid-state reaction method was used. Ball milling was used to reduce the particle size and increase the surface area as the cathode framework material. For the BCZY cathode backbone with sufficient porosity and good connectivity with the electrolyte, the subsequent infiltration experiment was performed with the best sintering parameter at 1100 ℃. The infiltration solution is compared using two formulations. One is to add glycine as a chelating agent and ethanol as a surfactant, using the infiltration solution formulation of the combustion synthesis method, and the other is to use ethylene glycol to grease the precursor solution. After drying, add ethylene glycol monobutyl ether as a surfactant, use an infiltration solution formula the sol gel method to discuss the surface morphology, microstructure and porosity, and then increase the loading of the infiltration solution to increase electrochemical activity site, and obtain the optimal infiltrated loading on BCZY backbone for preparing the composite cathode.
    Through the IV DC polarization curve and the electrochemical AC impedance spectrum for in-depth analysis to understand the reaction difference of different cathode structures in the proton transport solid oxide fuel cell, as the infiltration content increases, the reaction area of the three-phase interface can be increased. This leads to a decrease in polarization resistance, and it is known that excessive addition will result in insufficient porosity, so that oxygen at the cathode side cannot be fully diffused, and the oxygen reduction reaction proceeds to cause additional resistance. The best performance parameters are the composite cathode with a load of 55.8 wt.% using ethylene glycol infiltration solution, and the performance measured at 800 ℃ for the whole battery: open circuit voltage of 0.96 V and power density of 388 mW/cm2..

    摘要 v Abstract vi 致謝 viii 目錄 ix 表目錄 xii 圖目錄 xiii 符號說明 xvi 第一章 緒論 1 1-1前言 1 1-2研究動機 1 1-3問題所在 2 1-4解決方式 3 第二章 基礎原理與文獻回顧 5 2-1燃料電池簡介 5 2-2 固態氧化物燃料電池原理與介紹 6 2-2-1固態氧化物燃料電池簡介 6 2-2-2固態氧化物燃料電池類型與原理 7 2-2-3固態氧化物燃料電池元件 9 2-3固態氧化物燃料電池陰極 11 2-3-1陰極傳導機制[22] 11 2-3-2陰極晶體結構 13 2-3-3陰極材料製備方式 15 2-4燃料電池電化學檢測 17 2-4-1直流電極化曲線(I-V Curve)原理 17 2-4-2電化學交流阻抗頻譜(EIS)原理 20 2-5文獻回顧 23 2-5-1 SOFC陰極材料 23 2-5-2 SOFC複合陰極 24 2-5-3 浸潤法 25 第三章 實驗方法步驟與設備 28 3-1 實驗原料 28 3-2實驗流程與元件樣品製備 28 3-2-1 BaCe0.6Zr0.2Y0.2O3-δ(BCZY)粉末製備 28 3-2-2陽極基板製備 28 3-2-3電解質層製備 29 3-2-4 BaCe0.6Zr0.2Y0.2O3-δ陰極骨架製備 30 3-2-5 全電池製備 30 3-2-6 導電度樣品製備流程 31 3-3分析設備 32 3-3-1 X光晶體繞射儀器(X-Ray diffraction; XRD) 32 3-3-2掃描式電子顯微鏡(Scanning Electron Microscope; SEM) 33 3-3-3導電度量測 34 3-3-4直流極化曲線測試平台 34 3-3-5電化學交流阻抗頻譜儀 35 第四章 結果 36 4-1 X光晶體繞射分析 36 4-1-1 BCZY粉末之XRD分析 36 4-1-2 LSCF浸潤溶液之XRD分析 36 4-1-3 複合陰極化學穩定性分析 37 4-3表面形貌觀察 37 4-3-1乙醇浸潤溶液配方 37 4-3-2乙二醇浸潤溶液配方 38 4-4微觀結構觀察 38 4-4-1 BCZY骨架之SEM分析 39 4-4-2 浸潤之複合陰極SEM分析 39 4-2 陰極導電度測試 40 4-2-1 BCZY導電度 40 4-2-2 乙醇浸潤溶液LSCF導電度 40 4-2-3 乙二醇浸潤溶液LSCF導電度 40 4-5 I-V直流極化曲線電化學測試分析 41 4-5-1 乙醇浸潤溶液配方 41 4-5-2 乙二醇浸潤溶液配方 41 4-6 電化學交流阻抗頻譜分析 42 4-6-1 乙醇浸潤溶液配方交流阻抗頻譜 42 4-6-2 乙二醇浸潤溶液配方交流阻抗頻譜 42 第五章 討論 44 5-1 BaCe0.6Zr0.2Y0.2O3-δ骨架 44 5-1-1孔隙度分析 44 5-1-2 骨架與電解質連接性觀察 44 5-2 乙醇浸潤溶液 45 5-2-1 XRD 45 5-2-2 表面形貌觀察 45 5-2-3 孔隙度分析 46 5-2-4 導電度分析 46 5-2-5 全電池性能分析 47 5-3 乙二醇浸潤溶液 49 5-3-1 XRD 49 5-3-2 表面形貌觀察 49 5-3-3 孔隙度分析 50 5-3-4 導電度分析 50 5-3-5全電池性能分析 51 第六章 結論與未來工作 54 6-1結論 54 6-2 未來工作 55 參考文獻 56 表格 61 圖片 70

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