Ag/LSCF奈米纖維複合陰極應用於質子傳輸型固態氧化物燃料電池

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楊深宇(Shen-Yu Yang) 查詢紙本館藏

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材料科學與工程研究所

論文名稱

Ag/LSCF奈米纖維複合陰極應用於質子傳輸型固態氧化物燃料電池
(Ag/LSCF Nanofiber Composite Cathode for Proton-conducting Solid Oxide Fuel Cells)

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至系統瀏覽論文 (2025-7-1以後開放)

摘要(中)

本研究利用銀與靜電紡絲技術製備之La0.6Sr0.4Co0.2Fe0.8O3-δ(LSCF)奈米纖維均勻混合後，作為質子傳輸型固態氧化物燃料電池之複合陰極。銀價格低廉且具有優良的導電性與催化性，但是銀顆粒在高溫下容易粗化，造成陰極孔隙率降低，導致固態氧化物燃料電池陰極性能降低。故本研究將銀與LSCF奈米纖維均勻混合形成複合陰極，藉由測量不同混合比例下銀與LSCF奈米纖維之電池性能，及電化學交流阻抗頻譜量測，以釐清陰極端中氣體、氧離子、電子與質子之反應機制。
實驗結果顯示，六種組成比例參數中，以50%Ag-50%LSCF(Fiber)具有最佳電池性能，在800 ℃下最大功率密度值為212.90 mW/cm2，而參考試片100%Ag在800 ℃下最大功率密度值為138.04 mW/cm2，電池性能提升54%；於800 ℃下，50%Ag-50%LSCF(Fiber)之極化阻抗為0.076 Ω∙cm2，而100%Ag之極化阻抗為0.339 Ω∙cm2，故LSCF奈米纖維能夠有效提升電池性能與降低極化阻抗，同時提升全電池之長時間性能穩定性。
本文同時提出銀添加LSCF奈米纖維提升電池性能之機制：藉由LSCF奈米纖維抑制銀顆粒成長，同時擔任銀顆粒之間氧離子與電子之傳輸路徑。

摘要(英)

In this study, silver and La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) nanofibers prepared by electrospinning technology are evenly mixed and used as composite cathodes for proton-conducting solid oxide fuel cells (P-SOFCs). Silver is inexpensive and has excellent conductivity, however, the easy agglomeration of silver particles at high temperature reduces the cathode porosity resulting poor P-SOFC performance. We expect to improve the performance of solid oxide fuel cells using the blending of silver and LSCF nanofibers as composite cathodes in cells. In this study, cell performance (I-V curve) and electrochemical impedance spectroscopy (EIS) clarify the reaction mechanism of gas, oxygen ions, electrons and protons transport in the cathode.
The experimental results show that there exists the best cell performance in the 50%Ag-50%LSCF(Fiber) among six composition ratios. Results show that at 800 ℃, 50%Ag-50%LSCF(Fiber) exhibits higher cell performance and lower polarization impedance of 212.90 mW/cm2 and 0.076 Ω·cm2 compared to other proportions along with 100% Ag reference cell. Therefore, adding LSCF nanofibers can effectively improve the cell performance and long-term stability.
Mixing silver and LSCF nanofibers uniformly, LSCF nanofibers can effectively inhibit the agglomeration of silver particles, and simultaneously act as a transport path of oxygen ions and electrons between silver particles, so that LSCF nanofibers can be practically used in solid oxide fuel cells.

關鍵字(中)

★ 銀
★ 奈米纖維
★ 靜電紡絲
★ 陰極
★ 質子傳輸型固態氧化物燃料電池

關鍵字(英)

★ Ag
★ nanofiber
★ electrospinning
★ cathode
★ proton-conducting solid oxide fuel cell

論文目次

摘要 I
Abstract II
致謝 III
目錄 IV
圖目錄 VIII
表目錄 XI
前言 1
第一章、實驗原理與文獻回顧 3
1.1. 固態氧化物燃料電池(SOFC) 3
1.1.1. SOFC之原理 3
1.1.2. SOFC之優點 6
1.1.3. SOFC之結構 6
1.2. SOFC電解質材料與合成方法 9
1.2.1. 螢石(Fluorite)結構 9
1.2.2. 鈣鈦礦(Perovskite)結構及性質 10
1.2.3. SOFC電解質合成方法 11
1.2.4. 質子傳輸型電解質 14
1.2.5. 質子傳輸機制 15
1.3. SOFC電池製備方法 16
1.3.1. 乾壓成型技術(Dry pressing technique) 16
1.3.2. 刮刀成型技術(Tape casting technique) 17
1.3.3. 旋轉塗佈技術(Spin coating technique) 17
1.3.4. 電子束蒸鍍(Electron beam coating technique) 18
1.3.5. 雷射脈衝沉積(Pulse laser deposition technique) 19
1.4. 粉末燒結理論 19
1.4.1. 燒結過程 20
1.4.2. 燒結擴散機制 21
1.5. SOFC陰極材料與傳輸機制 22
1.5.1. 陰極材料種類 22
1.5.2. 電子與離子之傳輸機制 23
1.5.3. 銀電極與複合陰極(Composite cathode) 24
1.6. 靜電紡絲技術(Electrospinning technology) 26
1.6.1. 靜電紡絲原理 26
1.6.2. 靜電紡絲影響參數 27
1.6.3. 靜電紡絲技術應用於燃料電池 30
1.6.4. La0.6Sr0.4Co0.2Fe0.8O3-δ奈米纖維 31
1.7. 電化學分析原理 31
1.7.1. 極化曲線(I-V curve)之原理 31
1.7.2. 電化學交流阻抗頻譜之原理 34
1.7.3. 等效電路之簡介 35
第二章、實驗方法 38
2.1.　實驗藥品 38
2.2.　實驗方法與流程 40
2.2.1.　BCZY粉末合成 40
2.2.2.　刮刀成型技術製備陽極基板 40
2.2.3.　LSCF奈米纖維(Nanofiber)製備 41
2.2.4.　單電池製備 42
2.3.　材料性質分析 43
2.3.1.　X光粉末繞射儀 43
2.3.2.　掃描式電子顯微鏡(Scanning electron microscopy, SEM) 43
2.3.3.　穿透式電子顯微鏡(Transmission Electron Microscopy, TEM) 44
2.4.　單電池I-V 性能量測 45
2.5.　電化學交流阻抗分析 46
第三章、結果與討論 47
3.1.　材料相分析 47
3.1.1.　煆燒電解質粉末之相分析 47
3.1.2.　陰極材料與LSCF奈米纖維之相分析 48
3.2.　微結構分析 50
3.2.1.　LSCF奈米纖維之表面結構分析 50
3.2.2.　Ag-LSCF複合陰極之橫截面結構分析 51
3.3.　單電池I-V 性能曲線測量與分析 56
3.4.　單電池之EIS測量與分析 58
3.5.　單電池之長時間性能穩定性分析 63
第四章、結論 65
參考文獻 66

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指導教授

李勝偉(Sheng-Wei Lee)

審核日期

2020-7-2

推文