양성자 교환막 연료전지용 방향족 탄화수소계 SAFPAK/SPEEK 혼합막의 제조와 특성 분석 = Preparation and Characterization of Aromatic Hydrocarbon-Based SAFPAK/SPEEK Hybrid Membranes for Proton Exchange Membrane Fuel Cells

다국어 초록 (Multilingual Abstract)

The growing depletion of fossil fuels and the global demand for cleaner energy systems have intensified interest in hydrogen-based technologies. Among these, proton exchange membrane fuel cells (PEMFCs) are recognized for their high efficiency and zero-emission characteristics. A key component of PEMFCs is the proton exchange membrane (PEM), which facilitates proton transport while preventing electron and gas crossover. Although Nafion, the widely used commercial PEM, exhibits excellent proton conductivity and chemical stability, its high production cost and insufficient thermal stability limit its broader commercialization.
In this study, a novel polymer membrane, SAFPAK, was synthesized using Decafluorobiphenyl, 2,2-Bis(3-amino-4-hydroxyphenyl)hexafluoropropane, and 4,4′-Dihydroxybenzophenone. To address the limitations of Nafion and enhance membrane performance, blended membranes were fabricated by incorporating SPEEK (Sulfonated Poly(ether ether ketone)) at varying compositions (0%, 10%, 20%, 30%, 40%, 50%). The blending aimed to improve proton conductivity, thermal stability, and mechanical strength while reducing overall material cost.
The hydrophilicity and surface characteristics of the membranes were evaluated through contact angle measurements, confirming variations in wettability with increasing SPEEK content. Thermogravimetric analysis (TGA) demonstrated that all blended membranes maintained sufficient thermal stability above the operating temperature range of PEMFCs. Morphological analyses using FE-SEM revealed uniform surface structure and well-defined cross-sectional morphology across the blended membranes. Furthermore, mechanical testing using a universal testing machine (UTM) indicated that the incorporation of SPEEK contributed to enhanced structural integrity.
Overall, the SAFPAK/SPEEK blended membranes exhibit significant potential as cost-effective alternatives to commercial PEMs. Their improved physicochemical stability, tunable hydrophilicity, and reliable thermal and mechanical properties provide a promising foundation for future PEMFC applications and the development of durable, low-cost proton exchange membranes.

목차 (Table of Contents)

• 제 1장 서 론 1
• 1. 1 기후 변화 대응과 차세대 에너지 시스템으로서의 연료전지 1
• 1. 2 연료전지의 작동 원리 및 기본 구성 요소 2
• 1. 3 다양한 연료전지 기술의 분류 및 특성 4
• 1. 4 고분자전해질 연료전지 (polymer electrolyte membrane fuel cell, PEMFC)의 특징과 연구 동향 8
• 제 2장 실험 10
• 2. 1 시약 및 재료 10
• 2. 2 실험 방법 10
• 2. 3 특성 분석 15
• 제 3장 결과 및 고찰 19
• 3. 1 SAPFAK 및 SPEEK 합성 및 혼합막 제조 특성 19
• 3. 2 APFAK 및 SAPFAK의 화학구조 분석 21
• 3. 3 접촉각 측정(Contact angle, CA),함습률(Water uptake, WU), 팽윤율 (Swelling ratio, SR), 이온교환용량(Ion exchange capacity, IEC) 24
• 3. 4 형태학 분석 30
• 3. 5 표면 형상 및 거칠기 분석 35
• 3. 6 열적 특성 37
• 3. 7 기계적 특성 39
• 3. 8 산화 안정성 41
• 3. 9 이온전도도 43
• 3. 10 단일 전지 성능평가 45
• 제 4장 결론 47
• 참 고 문 헌 48