- 學位論文
二氧化矽/金屬有機骨架HKUST-1奈米核殼複合材料之製備及其在質子交換膜燃料電池上之應用
Preparation of Silica/MOF (HKUST-1) Core-Shell Nanocomposites and Application on PEMFC
摘要
本研究將二氧化矽與金屬有機骨架HKUST-1製備成核殼複合材料，並將其導入至Nafion高分子中，以重鑄法製備具良好分散性之質子交換複合膜且應用於燃料電池，探討奈米複合材料對單電池效能展現之影響。 由結果顯示，利用材料外層包覆的二氧化矽，保護內部HKUST-1在高溫環境下水分的散失，使其單電池效能提升。複合膜之保水率(Water Uptake)可提升40 wt.%~70 wt.%，質子導電度也都優於未添加任何奈米材料之RN膜。單電池測試結果，60 °C、全加濕環境(99.9 %)，FC-3之單電池有最佳的功率密度為718 mW cm-2，比RNFC高出約60 %；在80 °C、全加濕環境，FC-3之單電池最佳功率密度為642 mW cm-2，比FC-1高出約27 %。而FC-3在低加濕環境(15.0 %)下也有較優之單電池效能，在80 °C下，功率密度達619 mW cm-2，高出FC-1約26 %。證明二氧化矽的包覆，減緩HKUST-1在高溫下的水分散失以及低濕度環境下的保水能力，進而提升單電池效能之展現。
並列摘要
In this research, the silica and metal-organic frameworks (HKUST-1) were prepared the core-shell nanocomposites (HKUST-1@SiO2). The nanocomposites were added into Nafion to produce the well-dispersion proton exchange membrane. In order to evaluate the effect of the filler (HKUST-1@SiO2) on the performance of the proton exchange membrane fuel cells, the as-prepared composite membranes were studied and compared to that with the HKUST-1 composite membrane. The as-prepared core-shell nanocomposites (HKUST-1@SiO2) were characterized by FTIR, WXRD, TEM, BET and TGA. The properties of the composites membranes were investigated by their SEM-EDS, water uptake, proton conductivity and the corresponding PEMFC performance. The results showed that comparing with the HKUST-1 composite membranes, the higher water uptake of the composite membrane was significantly enhanced to 45.3 wt.%. Finally, the performances of PEMFC with the as-prepared HKUST-1@SiO2 composite membrane were also tested on the home-made system with H2/O2 gases. The best performance of the PEMFCs with the composite membranes was 26% higher than with HKUST-1 composite membrane under TH2/Tcell/TO2＝50/80/50 °C and 15.0% relative humidity condition, respectively.