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Study on Performance and Stability of Perovskite Cathodes for Intermediate Temperature Solid Oxide Fuel Cell Applications

Title
Study on Performance and Stability of Perovskite Cathodes for Intermediate Temperature Solid Oxide Fuel Cell Applications
Authors
Jin Wan Park
DGIST Authors
Park, Jin Wan; Hong, Seung-Tae; Lee, Kang Taek
Advisor(s)
이강택
Co-Advisor(s)
Seung-Tae Hong
Issue Date
2019
Available Date
2019-08-23
Degree Date
2019-08
Type
Thesis
Description
Solid oxide fuel cells, Perovskite, Cathode, Oxygen reduction reactions, Electrical conductivity relaxation
Table Of Contents
Ⅰ. Introduction 1.1 Solid Oxide Fuel Cells (SOFCs) 1 1.2 Polarization Losses of SOFC 2 1.3 Perovskite Cathode Materials 3 1.3.1 La0.8Sr0.2MnO3±δ (LSM) 3 1.3.2 La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) 3 1.4 Fluorite Electrolyte Materials 4 1.4.1 Stabilized Zirconia 4 1.4.2 Doped Ceria 5 1.4.3 Stabilized Bismuth Oxide 5 Ⅱ. Background 2.1 Surface Exchange and Diffusion 9 2.2 Electrical Conductivity Relaxation 9 2.2 Electrochemical Impedance Spectroscopy 10 Ⅲ. Development of La0.8Sr0.2MnO3-δ-Er0.4Bi1.6O3 Cathodes by Infiltration Technique 3.1 Introduction 11 3.2 Experimental 13 3.2.1 Sample Preparation 13 3.2.2 Characterization 14 3.3 Results and Discussion 15 3.3.1 Phase Structure and Chemical Compatibility 15 3.3.2 Microstructural Analysis 15 3.3.3 Area Specific Resistance of LSM infiltrated ESB Cathodes 16 3.3.4 Optimization by Precursor Solution Control 18 3.3.5 Optimized Microstructure and Electrochemical Performances 19 3.4 Conclusion 23 Ⅳ. La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF6428) Cathode Degradation Study with the Evaluation of Oxygen Transport Properties 4.1 Introduction 39 4.2 Experimental 41 4.2.1 Sample Preparation 41 4.2.2 Characterization 41 4.3 Results and Discussion 43 4.3.1 Oxygen Transport Properties 43 4.3.2 Microstructural Analysis 44 4.3.3 Chemical Composition Analysis 44 4.4 Conclusion 46 Ⅴ. La0.2Sr0.8Co0.8Fe0.2O3-δ (LSCF2882) Cathode with Enhanced Performance and Stability 5.1 Introduction 63 5.2 Experimental 64 5.2.1 Sample Preparation 64 5.2.2 Characterization 65 5.3 Results and Discussion 67 5.3.1 Phase Structure Analysis 67 5.3.2 Oxygen Transport Properties 69 5.3.3 Area Specific Resistance of LSCF2882 Cathodes 70 5.3.4 I-V Characterization and Stability 71 5.4 Conclusion 72 Ⅵ. Appendices Appendix A. ECR Measurement and Curve Fitting Manual 89 Appendix B. LSCF Based Cathodes 102 A-site deficient (La0.2Sr0.8)xCo0.8Fe0.2O3-δ (LSCF2882) 102 Pr0.2Sr0.8Co0.8Fe0.2O3-δ (PSCF2882) 104 Ⅶ. Conclusions 106 Ⅷ. References 108 Summary (in Korean) 120
URI
http://dgist.dcollection.net/common/orgView/200000219303
http://hdl.handle.net/20.500.11750/10470
DOI
10.22677/thesis.200000219303
Degree
Doctor
Department
Department of Energy Science and Engineering
University
DGIST
Related Researcher
  • Author Hong, Seung-Tae Battery Materials Discovery Laboratory
  • Research Interests Magnesium, calcium, and zinc ion batteries; lithium all-solid-state batteries, New inorganic materials discovery; Solid state chemistry; Crystallography; Mg, Ca, Zn 이온 이차전지; 리튬 전고체전지; 신 무기재료 합성; 고체화학; 결정화학
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Collection:
Department of Energy Science and EngineeringThesesPh.D.


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