奈米纖維化陰極應用於質子傳輸型固態氧化物燃料電池

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林緯昀(Wei-Yun Lin) 查詢紙本館藏

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材料科學與工程研究所

論文名稱

奈米纖維化陰極應用於質子傳輸型固態氧化物燃料電池
(Nanofibrous cathodes for proton-conducting solid oxide fuel cells)

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摘要(中)

本研究利用靜電紡絲技術製備La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF)陰極及BaCe0.6Zr0.2Y0.2O3-δ (BCZY)電解質奈米纖維，再將兩者與傳統陰極和電解質粉末混合，製作成質子傳輸型固態氧化物燃料電池之陰極；測量不同混合參數的電池性能(極化曲線)及電化學交流阻抗頻譜，探討陰極端中氣體、氧離子、質子與電子的反應機制。
針對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，藉此了解何種材料組合能為電池性能帶來提升。此外，本研究還進行陰極氣體加濕，觀察加濕前後，電池性能的變化與電化學交流阻抗之改變，以瞭解含水氣的空氣對陰極內部反應有何影響。
使用LSCF奈米纖維與純BCZY粉末製成混合陰極時，全電池於800 ℃下測得最佳效能：開路電壓為0.93 V、功率密度峰值為212.5 mW/cm2；因LSCF奈米纖維比純粉末擁有更多和氣體反應的面積，能大幅縮短氣體擴散進入陰極之距離，更能形成氧離子與電子傳輸網路，而不受為非電子導體的BCZY電解質粉末干擾。

摘要(英)

The composite cathodes of proton-conducting solid oxide fuel cells (P-SOFC) were fabricated by mixing of La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) nanofiber, BaCe0.6Zr0.2Y0.2O3-δ (BCZY) nanofiber, LSCF powder, or BCZY powder. The measurements of cell performance (I-V curve) and electrochemical impedance spectroscopy (EIS) were performed to investigate the chemical reaction mechanism between cathodes, gas, oxygen ions, protons, and electrons. Cell performance were also tested under humidified gas on the cathodes and to investigate the variations of chemical reactions.
The cell with the cathode which is composed of LSCF nanofiber and BCZY powder showed the best performance: 0.93 V for the open circuit voltage (OCV) and 212.5 mW/cm2 for the power density at 800 ℃. The LSCF nanofiber has lager reactive area for gas which can substantially reduce the distance of gas diffusion and forming the “conducting network” for oxygen ions and electrons.

關鍵字(中)

★ 靜電紡絲
★ 奈米纖維
★ 質子傳輸型固態氧化物燃料電池
★ 陰極
★ 電化學交流阻抗

關鍵字(英)

★ nanofiber
★ P-SOFC
★ cathode
★ EIS

論文目次

摘要 i
Abstract ii
目錄 iii
圖目錄 vi
表目錄 viii
第一章、前言 1
第二章、實驗原理與文獻回顧 3
2.1 固態氧化物燃料電池(SOFC) 3
2.1.1 SOFC之原理 3
2.1.2 SOFC之優點 5
2.1.3 SOFC之結構 6
2.2 SOFC之電解質材料 7
2.2.1 螢石結構(Fluorite) 7
2.2.2 鈣鈦礦結構(Perovskite) 8
2.2.3 質子傳輸型電解質 10
2.2.4 質子傳輸 10
2.3 電解質製備 11
2.3.1 固態反應法(Solid-state reaction) 11
2.3.2 溶膠-凝膠法(Sol-gel method) 11
2.4 SOFC全電池製備相關製程 12
2.4.1 刮刀成型(Tape casting) 12
2.4.2 旋轉塗佈(Spin coating) 12
2.4.3 靜電紡絲(Nanofiber electrospinning) 13
2.4.4 乾壓成型(Dry pressing) 14
2.4.5 電子束蒸鍍(Electron beam coating) 15
2.4.6 雷射脈衝沉積(Pulse laser deposition) 15
2.5 粉末燒結 16
2.5.1 燒結過程 16
2.5.2 燒結擴散機制 17
2.6 電化學分析 17
2.6.1 極化曲線(I-V curve) 17
2.6.2 電化學交流阻抗頻譜 19
2.6.3 等效電路 20
第三章、實驗方法 22
3.1 實驗藥品 22
3.2 實驗流程 22
3.2.1 BaCe0.6Zr0.2Y0.2O3-δ粉末製備 22
3.2.2 陽極基板製備 23
3.2.3 奈米纖維(Nanofiber)製備 23
3.2.4 全電池製備 24
3.3 材料性質分析 24
3.3.1 X光繞射分析(X-ray diffraction) 24
3.3.2 掃描式電子顯微鏡(Scanning electron microscope) 25
3.4 電池特性分析 25
3.4.1 電池I-V性能量測 25
3.4.2 電化學交流阻抗量測 26
第四章、結果與討論 27
4.1 材料性質分析 27
4.1.1 合成粉末分析 27
4.1.2 微結構分析 30
4.2 全電池之I-V性能曲線測量與分析 34
4.3 全電池之EIS測量與分析 38
4.4 陰極端氣體加濕之性能測量 41
第五章、結論 49
第六章、參考文獻 50

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指導教授

李勝偉(Sheng-Wei Lee)

審核日期

2019-11-25

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