LSAM 混和 LSGM 及其 Cr、 Zn 摻雜作為固態氧化物燃料電池電解質之可行性研究

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符禎元(chen-yuan Fu) 查詢紙本館藏

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材料科學與工程研究所

論文名稱

LSAM 混和 LSGM 及其 Cr、 Zn 摻雜作為固態氧化物燃料電池電解質之可行性研究
(Mixing of LSAM with LSGM doped with Cr and Zn as a feasible electrolyte of solid oxide fuel cells)

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至系統瀏覽論文 (2026-6-30以後開放)

摘要(中)

本論文在以低廉之鑭鍶鋁鎂(LSAM)氧化物和鑭鍶鎵鎂(LSGM)氧化物互相混合，製作LSGM-LSAM混和，探討其作為固態氧化物燃料電池電解質之可行性。首先依溶膠凝膠法來製備La0.8Sr0.2Ga0.8Mg0.2O3 (LSGM)與La0.9Sr0.1Al0.9Mg0.1O3 (LSAM)兩種粉末，再分別以0、25、50、75及100 wt.%等不同之比例將LSAM粉末與LSGM互相混和，燒結後探討此混和材料之結晶結構、形貌、導電率。隨後，將混合粉末製作固態氧化物燃料電池，進行測試。結果顯示：含25 wt.% LSAM之混和電解質，其電池功率密度約為純LSGM電解質電池之91%。
　　上述含25 wt.% LSAM之混和電解質，分別摻雜1.0 mol % Cr與1.0 mol % Zn元素，在800 oC下量測離子導電率結果顯示：摻雜Cr電解質之離子導電率下降(0.038 S/cm < 0.073 S/cm)，且導電活化能降低(1.37eV < 1.56 eV)；摻雜Zn電解質之離子導電率增高(0.088 S/cm > 0.073 S/cm)，導電活化能降低(1.35eV < 1.56 eV)。摻雜Cr電解質之熱膨脹係數為12.6×10-6/K；摻雜Zn電解質則為22.2×10-6/K，後者與陰極之膨脹係數(20.6×10-6/K)匹配度較高。隨後，製作陽極支撐型SOFC電池，經800 oC量測電池功率，結果顯示:摻1.0 mol % Zn含25 wt.% LSAM混和電解質之電池，其功率較高(173.6 mW/cm2 > 124.6 mW/cm2)。經濟性評估顯示：摻雜1.0 mol % Zn含25 wt.% LSAM混和電解質製作之SOFC，電池功率並不比純LSGM電池遜色，但成本降低約23.7%，，預期具有取代純LSGM電解質製作固態氧化物燃料電池之潛力，創造更高之經濟效益。

摘要(英)

In this study, low-cost lanthanum strontium aluminum magnesium (LSAM) oxide and lanthanum strontium gallium magnesium (LSGM) oxide are mixed with each other to make LSGM-LSAM composite, and explore its feasibility as a solid oxide fuel cell electrolyte. First, prepare La0.8Sr0.2Ga0.8Mg0.2O3 (LSGM) and La0.9Sr0.1Al0.9Mg0.1O3 (LSAM) powders by the sol-gel method, and then mix the LSAM powder and LSGM in different ratio (0, 25, 50, 75 and 100 wt.%), and discuss the crystal structure, morphology, and conductivity of the mixed material after sintering. Subsequently, the mixed powder was made into a solid oxide fuel cell for testing. The results show that the power density of the mixed electrolyte containing 25 wt.% LSAM is about 91% of that of the pure LSGM electrolyte support cell.
The above-mentioned mixed electrolyte containing 25 wt.% LSAM was doped with 1.0 mol% Cr and 1.0 mol% Zn respectively. The ion conductivity measured at 800 oC showed that the ionic conductivity of the doped Cr electrolyte decreased (0.038 S/ cm <0.073 S/cm), and the activation energy of conduction decreases (1.37eV <1.56 eV); the ionic conductivity of doped Zn electrolyte increases (0.088 S/cm> 0.073 S/cm), and the activation energy of conduction decreases (1.35eV < 1.56 eV). The thermal expansion coefficient of the doped Cr electrolyte is 12.6×10-6/K; the doped Zn electrolyte is 22.2×10-6/K, and the latter was more suitable with the expansion coefficient of the cathode (20.6×10-6/K). Subsequently, an SOFC anode-supported cell was fabricated, and the power density was measured at 800 oC. The results showed that: doped with 1.0 mol% Zn and 25 wt.% LSAM mixed electrolyte has a higher power (173.6 mW/cm2> 124.6 mW/cm2 ). Economic evaluation shows that: SOFC doped with 1.0 mol% Zn and 25 wt.% LSAM mixed electrolyte, power density is not inferior to pure LSGM cell, but the cost is reduced by about 23.7%, and it is expected to replace pure LSGM electrolyte to produce solid oxide The potential of fuel cells creates higher economic benefits.

關鍵字(中)

★ 固態氧化物燃料電池
★ 溶膠凝膠法
★ LSGM電解質材料
★ LSAM電解質材料
★ 過渡元素摻雜
★ Cr摻雜
★ Zn摻雜

關鍵字(英)

★ solid oxide fuel cell (SOFC)
★ sol-gel method
★ LSGM electrolyte material
★ LSAM electrolyte material
★ transition element doping
★ Cr doping
★ Zn doping

論文目次

摘要 i
Abstract ii
致謝 iv
目錄 v
表目錄 ix
圖目錄 xi
一、緒論 1
1-1簡介 1
1-2研究動機與目的 2
二、實驗原理與文獻回顧 4
2-1固態氧化物燃料電池 5
2-1-1固態氧化物燃料電池原理與簡介 5
2-1-2固態氧化物燃料電池類型 5
2-1-3固態氧化物電池元件 7
2-2電解質元件 9
2-2-1電解質傳導機制 9
2-2-2電解質晶體結構 10
2-2-3電解質材料製備方式 14
2-3電化學分析原理 15
2-3-1直流電極化曲線(I-V Curve)原理 16
2-3-2電化學交流阻抗頻譜(EIS)原理 18
2-4文獻回顧 20
三、實驗方法 24
3-1整體實驗架構及實驗原料 24
3-2粉末配置 24
3-2-1LSGM 24
3-2-2LSAM 25
3-2-3粉末混和 25
3-2-4 Cr、Zn的摻雜 25
3-3圓錠樣品製備 26
3-3-1小錠 26
3-3-2大錠 26
3-4電池製備 26
3-4-1電解質支撐型電池製備 26
3-4-2陽極支撐型電池製備 27
3-5分析設備 28
3-5-1 X光晶體繞射儀器 28
3-5-2掃描式電子顯微鏡 29
3-5-3導電率量測 29
3-5-4直流極化曲線測試平台 30
3-5-5電化學交流阻抗頻譜儀 30
四、結果 31
4-1 X光晶體繞射分析 31
4-1-1LSGM之X光繞射圖譜 31
4-1-2LSAM之X光繞射圖譜 31
4-1-3不同混和比例電解質小錠之X光繞射圖譜 32
4-1-4 Cr、Zn元素摻雜之X光繞射圖譜 32
4-2熱膨脹係數分析 32
4-2-1不同混和比例電解質小錠之熱膨脹係數 32
4-2-2 Cr、Zn元素摻雜之熱膨脹係數 33
4-3電解質導電率量測 33
4-3-1不同混和比例電解質小錠之導電率 33
4-3-2 Cr、Zn元素摻雜之導電率 34
4-4直流極化曲線測試分析 34
4-4-1不同混和比例電解質之直流極化曲線 34
4-4-2 Cr、Zn元素摻雜之直流極化曲線 34
4-4-3陽極支撐型電池之直流極化曲線 35
4-5電化學交流阻抗頻譜分析 35
4-5-1不同混和比例電解質之交流阻抗頻譜 35
4-5-2 Cr、Zn元素摻雜之交流阻抗頻譜 36
4-5-3陽極支撐型電池之交流阻抗頻譜 36
4-6掃描式電子顯微鏡之形貌觀察 36
4-6-1不同混和比例電解質之形貌觀察 36
4-6-2 Cr、Zn元素摻雜之形貌觀察 37
4-6-3陽極支撐型電池之形貌觀察 37
五、討論 38
5-1不同混和比例電解質 38
5-1-1X光晶體繞射分析 38
5-1-2熱膨脹係數分析 38
5-1-3導電率量測 39
5-1-4電池及EIS分析 40
5-2 Cr、Zn元素摻雜 41
5-2-1X光晶體繞射分析 41
5-2-2熱膨脹係數分析 42
5-2-3導電率量測 42
5-2-4電池及EIS分析 43
5-3陽極支撐型電池 44
六、結論 45
6-1結論 45
6-2未來工作 46
參考文獻 47

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指導教授

林景崎(jing-chie Lin)

審核日期

2021-10-12

推文