슬러리 스핀 코팅으로 증착된 전해질 두께 변화에 따른 음극 지지체 연료전지의 성능 평가

다국어 초록 (Multilingual Abstract)

In this study, the electrical performance of anode-supported solid oxide fuel cells (SOFCs) with Y2O3-stabilized ZrO2 (YSZ) electrolyte films of 5 to 20μm in thickness deposited by slurry spin coating method was discussed to aim at investigating the effect of the thickness of the YSZ electrolyte films on the electrical performance of the anode-supported SOFCs. The maximum power densities of anode supported SOFCs were increased with decreasing the YSZ electrolyte over 10μm thickness due to the decrease of the ohmic polarization. However, the ohmic polarization and electrode polarization were quite high compared with other data. As a main reason, the less amount of tripe phase boundary (TPB) is strongly expected. It was finally affecting on the electrical performance quite negatively. The maximum power densities were 16.2, 45 and 88.5 mW/cm2 at 700, 750 and 800℃, respectively. This result indicates that SOFCs with dense YSZ electrolyte require more effective deposition conditions for electrode, especially cathode to increase TPB area.

목차 (Table of Contents)

• CHAPTER 1 INTRODUCTION 1
• 1.1 What is a fuel cell 1
• 1.2 Solid oxide fuel cell 5
• 1.2.1 What is a Solid Oxide Fuel Cell 5
• 1.2.2 Polarizations 8
• 1.3 Objective of thesis 12
• REFFERNCES 14
• CHAPTER 2 EXPERIMENTAL TECHNIQUES 16
• 2.1 Materials synthesis 16
• 2.1.1 Modified sol-gel method 16
• 2.2 Deposition method 19
• 2.2.1 Slurry spin coating 19
• 2.3 Materials characterization 19
• 2.3.1 X-ray powder diffraction (XRD) 19
• 2.3.2 Scanning electron microscope (SEM) 19
• 2.3.3 Electrical conductivity measurement 20
• 2.4 Electrochemical characterization 20
• 2.5 Fabrication of coin cells 20
• CHAPTER 3 25
• EFFECT OF YSZ ELECTROLYTE THICKNESS ON ELECTRICAL PERFORMANCE OF ANODE SUPPORTED SOFCS BY SLURRY SPIN COATING 25
• 1. INTRODUCTION 27
• 2. EXPERIMENTAL 29
• 2.1. Slurry preparation 29
• 2.2. Substrate preparation 29
• 2.3. Preparation of cathode powder 30
• 2.4. Deposition procedure 30
• 2.5. Characterization 31
• 3. RESULTS AND DISCUSSION 31
• 3.1 Characteristics of powders 32
• 3.2 Open porosity of the NiO-SDC cermets 32
• 3.3 Electrical conductivity of LSCF 32
• 3.4 Microstructure of the YSZ layers 37
• 3.5 Microstructure of anode-supported SOFCs 41
• 3.6 Influence of YSZ thickness on the open circuit voltage of SOFC test cells 43
• 3.7 Influence of YSZ thickness on the output performance of SOFC test cells 43
• 4. Conclusions 51
• REFERENCES 52