전기영동증착법을 이용한 중저온 SOFC용 Sm-Ce-O(SDC) 전해질 필름의 제조 = Preparation of Samaria-doped-ceria(SDC) electrolyte film for intermediate solid oxide fuel cells by electrophoretic deposition

다국어 초록 (Multilingual Abstract)

In this work, a nano-sized samaria-doped ceria(SDC) was prepared by a urea-based hydrothemal method and the synthesized SDC powders were characterized. It was observed that the increase in synthesis time and temperature gave rise to particles size increase from XRD pattern investigation.
Subsequently for use as an electrolyte for anode-support intermediate temperature solid oxide fuel cell(IT-SOFC), SDC thin film was deposited on a porous NiO-SDC substrate by an electrophoretic deposition(EPD) method. The resulted thin film surfaces prepared from the EPD solution added with various amounts of polyethylene glycol(PEG) were studied. The defects in the film turned out to be reduced as the concentration of PEG increased. Also in the high deposition voltage, the hydrogen gas was evolved by the electrode reaction and the defect increased thereby. Thus, an increased film thickness due to prolonged deposition time also deteriorated the film quality. The most homogeneous SDC thin film formed in the experimented range was obtained when using acetone solvent with constant voltage of 20V for 10 s.

목차 (Table of Contents)

• 제 1 장 서 론 1
• 제 2 장 이론적 배경 6
• 2-1. 연료전지 발견 배경 6
• 2-2. SOFC 원리 및 특성 7
• 2-2-1. 작동원리 7
• 2-2-2. 성능 및 특징 12
• 2-3. 세리아계 전해질의 특성 15
• 2-4. EPD를 이용한 박막코팅 16
• 제 3 장 실험방법 및 측정 방법 18
• 3-1. SDC 전해질 합성 18
• 3-2. 이온전도도 측정 18
• 3-3. EPD용 기판 제조 21
• 3-4. EPD 23
• 제 4 장 결과 및 고찰 27
• 4-1. 합성된 SDC 전해질 분말 분석 27
• 4-2. 이온전도도 측정 32
• 4-3. 증착표면에 미치는 영향 35
• 4-3-1. Binder가 미치는 영향 35
• 4-3-2. 증착전압이 미치는 영향 38
• 4-3-3. 증착시간이 미치는 영향 38
• 제 5 장 결 론 46
• 참 고 문 헌 47