DGIST Scholar: Advanced process, analysis and engineering for solid oxide fuel cells and electrolyzers

Department of Energy Science and Engineering Theses Ph.D.

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Advanced process, analysis and engineering for solid oxide fuel cells and electrolyzers

Title: Advanced process, analysis and engineering for solid oxide fuel cells and electrolyzers

Alternative Title: 고체산화물 연료전지 및 고체산화물 수전해전지를 위한 첨단 공정, 분석 및 엔지니어링 연구

Author(s): Jeong Hwa Park

DGIST Authors: Jeong Hwa Park ; Yong Min Lee ; Kang Taek Lee

Advisor: 이용민

Co-Advisor(s): Kang Taek Lee

Issued Date: 2021

Awarded Date: 2021/02

Type: Thesis

Subject: Solid oxide fuel cells, Solid oxide electrolysis cells, oxygen electrodes, oxygen transport kinetics, impedance spectrum, 고체산화물 연료전지, 고체산화물 수전해전지, 산소 전극, 산소 이동 동역학, 임피던스 스펙트럼

Table Of Contents: Ⅰ. Introduction 1
Ⅱ. Background 5
2.1 Solid Oxide Cells (SOCs) 5
2.1.1 Solid Oxide Fuel Cells (SOFCs) 5
2.1.2 Solid Oxide Electrolysis Cells (SOECs) 6
2.1.3 Thermodynamic and electrochemical aspects of SOCs 6
2.2. Current state-of-the-art materials 8
2.2.1 Zirconium based oxides 8
2.2.2 Ceria based oxides 9
2.1.3 Perovskite oxygen electrode materials 10
2.3. Oxygen electrodes for SOCs 11
2.4. Manufacturing process of SOCS 11
2.4.1 Tape casing 11
2.4.2 Lamination 14
2.4.3 Co-firing 14
2.5. Impedance Spectroscopy 15
2.6. Distribution function of relaxation times (DRTs) 15
Ⅲ. Ultra-fast Fabrication of Tape-cast Anode Supports for SOFCs via Resonant Acoustic Mixing Technology 22
3.1. Introduction 22
3.2. Experimental 24
3.2.1 Preparation of tape casted NiO-YSZ anode support 24
3.2.2 Fuel Cell Fabrication 25
3.2.3 Perovskite oxygen electrode materials 25
3.3. Results and Discussion 26
3.3.1 Optimization of The RAM Process for Tape-Cast NiO-YSZ Slurry 26
3.3.2 Microstructural Analysis of The RAM Ni-YSZ Anode Support 28
3.3.3 Electrochemical Performance of The RAM Ni-YSZ Anode Supported SOFC 29
3.4. Conclusion Perovskite oxygen electrode materials 30
Ⅳ. Diagnosis of SOCs via Electrochemical Impedance Spectroscopy 39
4.1. Introduction 39
4.2. Experimental 40
4.2.1 Cell Fabrication 40
4.2.2 Characterization 40
4.3. Results and Discussion 41
4.4. Conclusion 43
Ⅴ. Boosting the Performance of SOEC via Incorporation of Gd3+ and Nd3+ Double-doped Ceria 52
5.1. Introduction 52
5.2. Experimental 54
5.2.1 Sample Preparation 54
5.2.2 Cell Fabrication 55
5.2.3 Characterization 55
5.3. Results and Discussion 56
5.3.1 Phase Analysis 56
5.3.2 Electrochemical Performance 57
5.4. Conclusion 61
Ⅵ. Enhancing Bifunctional Electrocatalytic Activities of Oxygen Electrodes via Incorporating Highly Conductive Sm3+ and Nd3+ Double-doped Ceria for RSOCs 72
6.1. Introduction 72
6.2. Experimental 74
6.2.1 Materials synthesis 74
6.2.2 Symmetric cells preparation 75
6.2.3 Button cell fabrication 75
6.2.4 Characterization 75
6.3. Results and Discussion 77
6.4. Conclusion 88
Ⅶ. Densification of Diffusion Barrier Layer for SOCs 116
7.1. Introduction 116
7.2. Experimental 117
7.2.1 Materials synthesis 117
7.2.2 Button cell fabrication 117
7.2.3 Characterization 118
7.3. Results and Discussion 119
7.4. Conclusion 120
Ⅷ. Summary 127
Ⅸ. References 129
Summary (in Korean) 149