Title

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

DGIST Authors

Hong, Seung-Tae ; Park, Jin Wan ; Lee, Kang Taek

Advisor

이강택

Co-Advisor(s)

Seung-Tae Hong

Issued Date

2019

Awarded Date

2019-08

Citation

Jin Wan Park. (2019). Study on Performance and Stability of Perovskite Cathodes for Intermediate Temperature Solid Oxide Fuel Cell Applications. doi: 10.22677/thesis.200000219303

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

Publisher

DGIST

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