표제지
국문초록
목차
I. 서론 13
II. 이론적 배경 16
2.1. 고체산화물 연료전지(SOFC) 16
2.1.1. 연료전지(Fuel Cell) 16
2.1.2. 고체산화물 연료전지의 특징 및 작동원리 20
2.1.3. SOFC의 구성 24
2.2. δ-Bi₂O₃와 LaGaO₃계 전해질의 특성 27
III. 실험 방법 28
3.1. Y0.25B0.75O1.5 전해질 제조(이미지참조) 28
3.2. Bi₂MexV1-xO5.5-₃x/₂(Me=Cu, Co) 전해질 제조(이미지참조) 29
3.3. La0.8Sr0.2Ga0.8-xMg0.2CoxO3-δ 전해질 제조(이미지참조) 30
3.4. 분석장비 31
IV. 결과 및 고찰 32
4.1. Y0.25B0.75O1.5(이미지참조) 32
4.1.1. YBO 전해질의 열분석 32
4.1.2. 물성평가 34
4.1.3. 전기적 특성 평가 39
4.2. Bi₂MexV1-xO5.5-₃x/₂ (Me=Cu, Co)(이미지참조) 41
4.2.1. BIMEVOX (Me=Cu, Co) 전해질의 열분석 41
4.2.2. 물성 평가 43
4.2.3. 전기적 특성 평가 47
4.3. La0.8Sr0.2Ga0.8-xMg0.2CoxO3-δ(이미지참조) 52
4.3.1. LSGMC 전해질의 열분석 52
4.3.2. 물성평가 54
4.3.3. 전기적 특성 평가 59
V. 결론 63
VI. 참고문헌 65
Abstract 67
Table 1. Description of Major Fuel Cell types 18
Table 2. The crystallite size and the ionic conductivity of YBO pellets sintered at different temperatures 36
Table 3. Composition ratio of YBO pellet sintered at 800℃ 38
Table 4. The ionic conductivity and activation energy of Bi₂MexV1-xO5.5-₃x/₂ (0≤x≤0.2) pellets sintered at 800℃(이미지참조) 51
Table 5. The crystallite size and lattice parameter of La0.8Sr0.2Ga0.8-xMg0.2Cox (0≤x≤0.15) samples sintered at 1350℃(이미지참조) 57
Table 6. The conductivity and the activation energy of La0.8Sr0.2Ga0.8-xMg0.2Cox (0≤x≤0.15) electrolytes depending on operating temperatures. (Rgb: grain boundary resistance and Rb: bulk resistance)(이미지참조) 62
Figure 1. The operating principle of various Fuel cells: (a) PEMFC, (b) PAFC, (c) AFC, and (d) MCFC 19
Figure 2. The composition and operating principle of solid oxide fuel cell(SOFC) 23
Figure 3. Pictorial summary of major factors that contribute to fuel cell performance 23
Figure 4. An example of SOFC system types: (a) planar and (b) tubular 26
Figure 5. TGA-DSC curves of the YBO precursor synthesized by ammonium carbonate coprecipitation 33
Figure 6. XRD patterns of YBO pellets sintered at different temperatures (1) 700℃ , (2) 750℃ , (3) 800℃ , and (4) 850℃ 36
Figure 7. Scanning electron micrographs of YBO powders calcined at (1) 500℃ and (2) 600℃ and YBO pellets sintered at different temperatures (a) 700℃, (b) 750℃, (c) 800℃, and (d) 850℃ 37
Figure 8. EDAX pattern of YBO pellet sintered at 800℃ 38
Figure 9. Arrhenius plots for YBO pellets annealed at different temperatures 40
Figure 10. Arrhenius plots for non ball-milled and ball-milled YBO pellets annealed at 850℃ 40
Figure 11. TGA/DSC curve of (a) BICUVOX and (b) BICOVOX precursors 42
Figure 12. XRD patterns of BICUVOX and BICOVOX pellets sintered at different temperatures: (a) 700℃ , (b) 750℃ , (c) 800℃ and (d) 850℃ 44
Figure 13. Crystallite sizes of BICUVOX and BICOVOX pellets sintered at different temperatures 45
Figure 14. SEM morphologies of (a) BICUVOX, (b) BICOVOX powders: (1) precursor and (2) calcined at 500℃ 45
Figure 15. SEM morphologies of BICUVOX pellets sintered at various temperatures: (a) 700℃ , (b) 750℃ , (c) 800℃ , and (d) 850℃ 46
Figure 16. SEM morphologies of BICOVOX pellets sintered at various temperatures: (a) 700℃, (b) 750℃, (c) 800℃, and (d) 850℃ 46
Figure 17. Arrhenius plot for Bi₂Cu0.1V0.9O5.35X pellets sintered at different temperatures (dc: Crystallite size, Ea: Activation energy)(이미지참조) 49
Figure 18. Arrhenius plot for Bi₂Co0.1V0.9O5.35X pellets sintered at different temperatures (dc: Crystallite size, Ea: Activation energy)(이미지참조) 49
Figure 19. Arrhenius plot for Bi₂MexV1-xO5.5-₃x/₂X (0≤ ≤0.2) pellets sintered at 800℃(이미지참조) 50
Figure 20. TGA/DSC curves of La0.8Sr0.2Ga0.8-xMg0.2Cox precursors prepared by ammonium carbonate coprecipitation: (a) x=0, (b) x=0.05≤x≤0.15(이미지참조) 53
Figure 21. XRD patterns of La0.8Sr0.2Ga0.8-xMg0.2Cox powders calcinded at 1000 ℃: (a) x=0, (b) x=0.05, (c) x=0.1, and (d) x=0.15(이미지참조) 56
Figure 22. XRD patterns of La0.8Sr0.2Ga0.8-xMg0.2Cox pellets sintered at 1350℃: (a) x=0, (b) x=0.05, (c) x=0.1, and (d) x=0.15(이미지참조) 56
Figure 23. SEM morphologies of LSGM and LSGMC (x=0.1) powders calcined at 1000℃: (a-1) LSGM precursor, (a-2) powders, (b-1) LSGMC precursor, and (b-2) powders 58
Figure 24. SEM morphologies of La0.8Sr0.2Ga0.8-xMg0.2Cox pellets sintered at 1350 ℃: (a) x=0, (b) x=0.05, (c) x=0.1, and (d) x=0.15(이미지참조) 58
Figure 25. Nyquist plots of La0.8Sr0.2Ga0.8-xMg0.2Cox pellets sintered at 1350℃ (operating temperature: 700℃)(이미지참조) 61
Figure 26. Arrhenius plots of the ionic conductivity of La0.8Sr0.2Ga0.8-xMg0.2Cox pellets sintered at 1350℃(이미지참조) 61