使用化學沉澱法合成新式導質子型固態氧 化物燃料電池陰極材料Ba0.5Sr0.5Fe1-xCuxO3-δ

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陳儀安(Yi-an Chen) 查詢紙本館藏

畢業系所

材料科學與工程研究所

論文名稱

使用化學沉澱法合成新式導質子型固態氧化物燃料電池陰極材料Ba0.5Sr0.5Fe1-xCuxO3-δ
(Synthesis of Novel Cathode Materials Ba0.5Sr0.5Fe1-xCuxO3-δ for P-SOFC by Chemical Precipitation Method)

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摘要(中)

本研究利用化學沉澱法，製作適用於導氫型固態燃料電池陰極材料Ba0.5Sr0.5Fe1-XCuXO3-δ的先驅物，進而煆燒獲得氧化物粉體，實驗時，經由調配藥品比例，經由調整滴定pH值，前驅粉體的煆燒溫度等因素，研究其結晶性質、表面形貌、熱性質分析、電化學性質等，以評估其作為導質子型固態氧化物燃料電池陰極的可行性。實驗結果顯示唯有在特定之pH值下，其煆燒過後之產物才會形成特定化學劑量比之Ba0.5Sr0.5Fe1-XCuXO3-δ鈣鈦礦型結構，由X光繞射分析儀（XRD）得知，當銅的添加量為0.3以下時，煆燒過後之XRD繞射圖顯示其產物為純的鈣鈦礦結構，但當銅的添加量大於0.4時則開始出現二次相;而隨著Cu添加量增加，氧化物各個繞射訊號皆往低角度偏移，此乃Cu的原子尺寸較Fe大所造成，利用掃描式電子顯微鏡（SEM）觀察其形貌為多孔性結構，隨著煆燒溫度的增加，固體顆粒明顯增大，部分顆粒間介面消失，孔隙度減少，在材料導電度方面銅的添加量為0.2的條件下導電度達最高94.3 S/cm。

摘要(英)

Precipitation of carbonates was used to prepare the precursor of Ba0.5Sr0.5Fe1-xCuxO3-δ, which was the potential material for making of the cathode used in the proton-conducting solid oxide fuel cells. In the precipitation process, a solution of nitrates was reacted with the saturated solution of ammonium carbonate by controlling the pH, After filtration,the precipitate was dried and calcined in a furnace controlled at 800, 850, 900, 950, 1000˚C 2 hr to form the oxide. The effects of stoichiometric ratio between Fe/Cu and calcination temperature on the morphology, crystalline structure of the catalysts and cathodic behavior used in P-SOFC were of interest. Examination through field emission scanning electron microscope (FE-SEM) equipped with energy dispersive x-ray analysis (EDS), we could compare the morphology and composition for the powders. Analysis by x-ray diffraction (XRD), we could distinguish the crystal structures. The gravimetrical and thermal properties of various precursors in calcination process were determined by thermal gravimetrical analysis (TGA) and Differential Scanning Calorimeter (DSC). After making the calcined oxides as the cathode catalysts in a single cell, I-V polarization test were conducted to evaluate the electrochemical performance. The result showed that Pure perovskite structure were observed in X-ray diffraction (XRD) measurement with Cu-dopping at X = 0.1 to 0.3. The porosity was determined to be 36.4% by means of Archimedes method.The electrical conductivity of Ba0.5Sr0.5Fe0.8Cu0.2O3-δ reaches the maximum value of 94.3 S/cm at 450 °C,
Preliminary results demonstrate that the cobalt-free oxide Ba0.5Sr0.5Fe1-XCuXO3-δ is a very promising cathode material for application in P -SOFC.

關鍵字(中)

★ 固態氧化物燃料電池
★ 化學沉澱法
★ 陰極

關鍵字(英)

★ SOFC
★ Chemical precipitation
★ cathode

論文目次

摘要 ................................ i
Abstract ........................... ii
致謝 ................................ iii
目錄 ................................ iv
表目錄 ............................... viii
圖目錄 ............................... ix
第一章緒論 ........................... 1
1-1 前言 ............................. 1
1-2 研究動機與目的...................... 4
第二章原理與文獻回顧.................... 8
2-1固態氧化物燃料電池（SOFC）簡介......... 8
2-2固態氧化物燃料電池工作原理............. 9
2-3固態氧化物燃料電池之極化現象........... 11
2-4質子傳導型固態氧化物燃料電池之材料性質... 13
2-4-1 陽極材料........................ 13
2-4-2 電解質材料....................... 14
2-4-3 陰極材料......................... 15
2-4-4 陰極材料結構...................... 16
2-5固態氧化物燃料電池裝置類型與支撐結構..... 19
2-6固態氧化物電池材料常用合成法............ 20
2-7文獻回顧............................ 24
2-7-1 SOFC 陰極材料文獻回顧.............. 24
2-7-2 電化學交流阻抗文獻回顧.............. 25
第三章實驗方法.......................... 28
3-1 實驗藥品與材料....................... 28
3-2 實驗製備與流程....................... 28
3-2-1 BSCF 陰極粉末製備.................. 28
3-2-2 塊材成型與燒結..................... 29
3-2-3 陰極膏製備......................... 29
3-2-4 全電池製備......................... 30
3-3 材料性質分析.......................... 31
3-3-1 X光繞射儀（X-Ray Diffractormeter, XRD）.. 31
3-3-2 掃描式電子顯微鏡(SEM) 與能量散射光譜儀（EDS）.. 32
3-3-3 熱性質分析儀（TGA、DSC）............. 32
3-3-4 感應耦合電漿質譜分析儀（ICP-MS........ 33
3-3-5 孔隙率量測......................... 34
3-3-6 電導率量測 ........................ 35
第四章研究結果 .......................... 36
4-1 鈣鈦礦容忍因子........................ 36
4-2 前驅溶液滴定結果...................... 36
4-3 陰極粉體之 XRD分析.................... 37
4-4 SEM表面分析.......................... 39
4-4-1 陰極粉體表面形貌..................... 39
4-4-2 全電池陰極表面與斷面形貌............... 40
4-5 EDS半定量分........................... 41
4-6 ICP-MS 分析.......................... 41
4-7 粉末熱重分析........................... 41
4-8 熱式差掃描分析......................... 42
4-9 材料電導率分析......................... 42
4-10 孔隙率量測........................... 42
4-11 直流電極化曲線(IV&IP Curve)分析........ 43
第五章討論 .............................. 44
5-1 改變滴定pH值之探討..................... 44
5-2 改變添加銅含量之探討.................... 45
5-3 改變煆燒溫度的探討...................... 47
5-4 改變分散劑含量的探討.................... 48
5-5 陰極粉體煆燒過程的探討................... 48
5-6 電導率的探討........................... 49
第六章結論................................ 51
第七章參考文獻..............................53

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指導教授

林景崎(J. C. Lin)

審核日期

2014-8-21

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