合成質子傳導型電解質與奈米纖維陽極功能層於H+-SOFC之應用研究

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研究生：	黃俞碩 Yu-Shuo Huang
論文名稱：	合成質子傳導型電解質與奈米纖維陽極功能層於H+-SOFC之應用研究 Synthesis and Characterization of Proton-conducting Electrolytes and Nano-fiber Anode Functional Layer for H+-SOFC Applications
指導教授：	李勝偉 Sheng-Wei Lee
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：	2015
畢業學年度：	103
語文別：	中文
論文頁數：	76
中文關鍵詞：	溶膠-凝膠法、固態氧化物燃料電池、電解質、奈米纖維、陽極功能層
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態氧化物燃料電池電解質材料之化學穩定性、燒結緻密性、相均勻性以及離子傳導性，本實驗利用溶膠-凝膠製備以BaCe0.8Y0.2O3-δ為基礎之電解質材料，此氧化物在中溫(600-800℃)範圍內具有穩定之質子傳導性，但由於此材料之高溫化學穩定性及燒結緻密性不佳，因此必須添加Sr及Zr來抑制生成不純相，為了增進燒結緻密性，故本研究利用成分交換法均勻混合Ba1Ce0.8Y0.2O3-δ及Ba0.6Sr0.4Ce0.4Zr0.4Y0.2O3-δ，於1600℃下燒結4小時，使成分均勻擴散形成單相Ba0.8Sr0.2Ce0.6Zr0.2Y0.2O3-δ，並觀察其顯微結構以及利用拉曼圖譜分析此材料於高溫CO2環境下之化學穩定性，並作成單電池Pt /電解質/ Pt測量電解質之電導率及電池能量密度。之後以陽極支撐的方式製作電池，將電解質減薄至50 μm以下，縮短質子傳遞路徑，另外加入陽極功能層(functional layer) SrCe0.8Y0.2O3-δ奈米纖維結構來達到增加陽極與電解質間之表面積，以利燃料催化得更完全，進而提升電池電化學表現及能量密度。

This study reports the synthesis of proton-conducting Ba1-xSrxCe0.8-xZrxY0.2O3-δ (x =0, 0.2, 0.4) ceramics by using a combination of citrate-EDTA complexing sol-gel process and the composition-exchange method. Compared to the sintered oxides of similar composition prepared from conventional sol-gel powders,Ba0.8Sr0.2Ce0.6Zr0.2Y0.2O3-δoxides synthesized by sol-gel combined with the composition-exchange method are found to exhibit improved sinterability, higher conductivity, more homogeneous phase. Among all sintered oxides in this study, the Ba0.8Sr0.2Ce0.6Zr0.2Y0.2O3-δpellet fabricated by this new method has the highest conductivity, 0.017 S/cm at 800℃, which is higher than those pressed from conventional sol-gel powders. Based on the experimental results, we discuss the mechanism for improvement in these properties in terms of calcined particle characteristics. This work demonstrates thatBa0.8Sr0.2Ce0.6Zr0.2Y0.2O3-δoxides synthesized by sol-gel combined with the composition-exchange method would be a promising electrolyte for H+-SOFC applications.
A SrCe0.8Y0.2O3-δ-NiO anode functional layer was added between the Ba0.8Sr0.2Ce0.6Zr0.2Y0.2O3-δelectrolyte and the Ba0.8Sr0.2Ce0.6Zr0.2Y0.2O3-δ-NiO anode substrate to investigate its effect on the performance of single cells. Anode-supported electrolyte fuel cells were fabricated and tested. The single cell without SrCe0.8Y0.2O3-δ-NiO anode functional layer generated maximum power densities of 201.08 mWcm−2 at 800 °C. Electrochemical impedance spectroscopy (EIS) measurements for three cells revealed that the addition of the anode functional layer reduced the contact resistance as well as the polarization resistance for the cell, resulting thus in the improved cell performance.

摘要…………………………………………..…………....i
Abstract………………………………………..………....ii
致謝.......................................... iv
目錄……………………………………………..………...v
圖目錄………………………………………….…...…....ix
表目錄…...………………………………………….........xi
第一章 緒論    ………..1
1燃料電池之簡介    1
2固態氧化物燃料電池(SOFC)    1
2.1 SOFC之原理    1
2.2    SOFC之優點    4
2.3 SOFC之結構    4
2.4    SOFC電解質材料製備方式    6
3 SOFC電解質材料    7
3.1螢石(Fluorite)結構    7
3.2鈣鈦礦(Perovskite)結構及性質    8
3.3質子傳輸機制    9
第二章 實驗方法    11
1    實驗藥品    11
2    BaCO3-based 粉末製備    12
3    成分交換法(composition-exchange method)    13
4    BaCO3-based 粉末乾壓    13
5    材料分析    13
5.1    X-ray繞射(X-ray Diffraction)    13
5.2    掃描式電子顯微鏡(Scanning Electron Microscopy)    14
5.3拉曼光譜分析(Raman Spectrometer Analysis)    14
6    電性分析    15
7    化學穩定性    15
8    電解質能量密度測量    16
9    靜電紡絲技術(Nanofiber Electrospinning Unit)    16
10電化學阻抗頻譜法(EIS)    18
10.1EIS之簡介    18
10.2等效電路之簡介    20






第三章 合成質子傳輸型電解質材料.............................23
1    研究動機    23
2    實驗步驟    25
2.1BaCeO3-based 電解質材料製備    25
2.2成分交換法製備Ba0.8Sr0.2Ce0.6Zr0.2Y0.2O3-δ    25
3    結果與討論    26
3.1形貌與結構分析    26
3.2化學熱穩定性分析    28
3.3拉曼圖譜分析    30
3.4電導率測量    32
3.5能量密度測量    33
4    結論    35
第四章 奈米纖維陽極功能層於H+-SOFC之應用.....36
1    研究動機    36
2    實驗步驟    37
2.1製備SrCe0.8Y0.2O3-δ奈米纖維    37
2.2電解質刮刀成型    37
2.3陽極刮刀成型    38
2.4疊壓-共燒    38
3    結果與討論    39
3.1奈米纖維結構之形貌    39
3.2陽極支撐型H+-SOFC製作    43
3.3陽極支撐型H+-SOFC之燒結    44
3.4陽極支撐型H+-SOFC與陽極功能層    46
3.5陽極支撐型H+-SOFC之電性量測    49
3.6陽極支撐型H+-SOFC之EIS測量    51
4    結論    52
第五章 未來展望………………………………………53
參考文獻………………………………………………..54

                                

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