合成BaCe0.6Zr0.2Y0.2O3-δ 和La0.6Sr0.4Co0.2Fe0.8O3-δ 奈米纖維應用於質子傳導固態氧化物燃料電池複合陰極之研究

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黃氏碧玉(Huynh Thi Bich Ngoc) 查詢紙本館藏

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應用材料科學國際研究生碩士學位學程

論文名稱

合成BaCe0.6Zr0.2Y0.2O3-δ 和La0.6Sr0.4Co0.2Fe0.8O3-δ 奈米纖維應用於質子傳導固態氧化物燃料電池複合陰極之研究
(Study on synthetic BaCe0.6Zr0.2Y0.2O3-δ and La0.6Sr0.4Co0.2Fe0.8O3-δ nanofibers as composite cathode for proton-conducting solid oxide fuel cell)

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摘要(中)

在本研究中利用一維奈米纖維作為離子電子導體電極的支撐層進行了深入研究。
採用靜電紡絲技術合成 La0.6Sr0.4Co0.2Fe0.8O3-δ 氧化物奈米纖維，用於質子傳導固態氧化
物燃料電池。本研究以溶液注率和外加電壓等參數來優化靜電紡絲的奈米纖維製程。
最佳的製程參數落在溶液注率: 0.5 mL/h、外加電壓: 12 kV、收集距離: 12cm，此參數下
可獲得直徑約 479 nm 的均質奈米纖維。BaCe0.6Zr0.2Y0.2O3-δ氧化物奈米纖維亦是透過相
同製程參數合成直徑約 225 nm 之鈣鈦礦結構奈米纖維。La0.6Sr0.4Co0.2Fe0.8O3-δ 和
BaCe0.6Zr0.2Y0.2O3-δ奈米纖維的形貌和微觀結構會於本文中進行論述。
以靜電紡絲技術合成的 La0.6Sr0.4Co0.2Fe0.8O3-δ 和 BaCe0.6Zr0.2Y0.2O3-δ 的奈米纖維以
煆燒的方式成相，再利用掃描式電子顯微鏡（SEM）和掃描穿透式電子顯微鏡（STEM）
分析煆燒後的奈米纖維的表面形態及微結構。 La0.6Sr0.4Co0.2Fe0.8O3-δ 和
BaCe0.6Zr0.2Y0.2O3-δ 的晶體結構透過 X 射線繞射進行檢測，確認兩者皆為鈣鈦礦結構。
經由顯微結構的分析，可推斷 LSCF 和 BCZY 為中溫型固態氧化物燃料電池中具有潛力的材料系統

摘要(英)

In this study, mixing ionic electronic conductor electrode scaffolds form by a number of one-dimensional nanofibers are intensively investigated, obtained through electrospinning technique. The La0.6Sr0.4Co0.2Fe0.8O3-δ oxide nanofibers was synthesized by electrospinning technique for proton conducting solid oxide fuel cell. Optimization of the flow rate and applied voltage parameters for electrospinning process. The results exhibit that a solution flow rate of 0.5 mL/h, an applied voltage of 12 kV, and the distance between the needle and collector of 12cm allow to obtain tissues with an average nanofiber diameter of 479 nm. BaCe0.6Zr0.2Y0.2O3-δ oxide nanofibers were also produced in the same condition. The obtained BCZY ﬁbers with well-developed perovskite structures were 225 nm in diameter. Morphologies and microstructure of La0.6Sr0.4Co0.2Fe0.8O3-δ and BaCe0.6Zr0.2Y0.2O3-δ nanofiber were studied in this thesis.
After electrospinning process, the La0.6Sr0.4Co0.2Fe0.8O3-δ and BaCe0.6Zr0.2Y0.2O3-δ nanofibers were calcined. The subsequent calcination processes are investigated through scanning electron microstructure (SEM) and scanning transmission electron microscopy (STEM), which shows morphologies and microstructures. The crystal structure of La0.6Sr0.4Co0.2Fe0.8O3-δ and BaCe0.6Zr0.2Y0.2O3-δ nanofibers was examined by X-ray diffraction that can be indexed as a pure perovskite-type phase of both LSCF and BCZY. The morphological chacteristics of the LSCF and BCZY calcined tissues are very promising for application in intermediate temperature solid oxide fuel cell (IT-SOFC) as copmposite cathode.

關鍵字(中)

★ 固態氧化物燃料電池
★ 奈米纖維
★ 質子傳導陰極
★ 靜電紡絲技術

關鍵字(英)

★ SOFC
★ nanofibers
★ proton-conducting
★ cathode
★ electrospinning.

論文目次

Contents
摘要 i
Abstract ii
Acknowledgment ii
Contents iii
List of tables v
List of Figures vi
List of Symbols vii
List of Abbreviations viii
1 Literature review 1
1.1 The development of the fuel cell 1
1.2 Solid oxide fuel cell (SOFC) 4
1.2.1 Principle of SOFC 4
1.2.2 Thermodynamics of SOFC [5, 7] 6
1.2.3 Structure of SOFC 9
1.3 Electrospinning 13
1.3.1 Electrospinning process 13
1.3.2 Electrospinning parameters 15
1.4 Electrochemical analysis 16
1.4.1 Ohmic polarization [2, 5, 7, 9] 17
1.4.2 Concentration polarization [5, 7, 9] 17
1.4.3 Activation polarization [2, 5, 7, 9] 17
2 Experimental procedure 19
2.1 Material synthesis 19
2.1.1 Synthesis of LSCF, BCZY nanofibers 19
2.2 Materials characterization 20
2.2.1 X-ray diffraction (XRD) 20
2.2.2 Scanning electron microscope (SEM) 20
2.2.3 Scan Transmission electron microscopy (STEM) 20
2.2.4 Measurement I-V 20
3 Result and discussion 21
3.1 Morphological and microstructure characterization of nanofibers 21
3.1.1 La0.6Sr0.4Co0.2Fe0.8O3- nanofibers 21
3.1.2 BaCe0.6Zr0.2Y0.2O3- nanofibers 25
3.2 Analysis of X-ray diffraction (XRD) of nanofibers 28
3.2.1 La0.6Sr0.4Co0.2Fe0.8O3- Nanofibers 28
3.2.2 BaCe0.6Zr0.2Y0.2O3- Nanofibers 30
4 Conclusion 35
5 References

參考文獻

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指導教授

李勝偉(Sheng-Wei Lee)

審核日期

2019-8-21

推文