- 學位論文
燃料電池用奈米黏土複合材料雙極板之製程及其性質之研究
Preparation and characterization of clay/nanocomposite bipolar plate for fuel cell
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摘要
本研究利用乙烯酯樹脂與奈米黏土及導電碳化物以塊狀模造成型(BMC)的加工方式，製備複合材料雙極板。其中導電碳化物為石墨，奈米黏土包括蒙脫土、D400/蒙脫土、D230/蒙脫土、D2000/蒙脫土。改變奈米黏土的添加比例，測試複合材料雙極板的氣體滲透率、抗折強度、耐衝擊強度、導電性質、熱膨脹性質及燃燒性質等。 本研究的BMC配方可壓出有流道的複合材料雙極板，目前的技術可壓出流道寬度及深度均為1 mm，流道間距離為1 mm，雙極板厚度為1.5 mm的複合材料雙極板。 複合材料雙極板在250 oC前，可保持熱穩定性。不同配方製成的複合材料雙極板的比重由1.71增加至1.86，孔隙度由1.71%減少至0.25 %，抗曲強度由31.50(MPa)增加至50.11(MPa)，艾氏無缺口衝擊強度由58.21(J/m)增加至87.10(J/m)，導電度由260(S/cm)增加至306(S/cm)，腐蝕電流由8.4 10-7(Amps/cm2)減少至4.6 10-8(Amps/cm2)，氦氣滲透率由8.13 10-7(cm3/cm2-sec)減少至2.54 10-8(cm3/cm2-sec)，熱膨脹係數由16.69(μm/moC)增加至41.24(μ m/moC)，線性收縮率由0.07(%)增加至0.18(%)，熱傳導率由13.94 (W/m-K) ~18.06(W/m-K)。複合材料雙極板具防火難燃性質，符合UL-94V0，LOI>50。添加MMT/D2000之複合材料雙極板其單電池電流密度最高可達到0.65 A/cm2，電功率密度也可達到0.16 W/cm2。
並列摘要
A polymer composite bipolar plate for polymer electrolyte fuel cell has been prepared successfully by bulk molding compound (BMC) process. The composite bipolar plate is composed of vinyl ester resin, conductive carbon compound and nano clay. The conductive carbon compound includes graphite. Organoclay was prepared by ionic exchange of montmorillonite (MMT) with poly(oxypropylene)-backboned amines. The nano clay includes Montmorillonite、Diamine230/Montmorillonite、Diamine400/Montmorillonite、DiamineD2000/Montmorillonite. Characterization of composite bipolar plate was conducted with various nanoclay contents. The flexural strength and the impact strength of composite bipolar plate were tested. The gas permeability and the corrosion current of composite bipolar plate were investigated. The thermal expansion coefficient and the linear shrinkage of composite bipolar p1ate were measured. The flame retardance property of composite bipolar p1ate was also studied. Both the flow field path and depth in composite bipolar plate was 1 mm and the flow field land were 1 mm. The thickness of composite bipolar was 1.5 mm. TGA was used to analyze the thermal property of composite bipolar plate, it shows the thermal stability is 250 oC. Density of composite bipolar plate was increased from 1.71 gcm-3 to 1.86 gcm-3. Porosity of composite bipolar plate was decreased from 1.71 % to 0.25 %. The flexural strength of composite bipolar plate was increased from 31.50 MPa to 50.11 MPa. The unnotched Izod impact strength was increased from 58.21 J/m to 87.10 J/m. The electrical conductivity was increased from 260 S/cm to 306 S/cm . The gas permeability was decreased from 8.13 10-7 cm3cm-2sec-1 to 2.54 10-8 cm3cm-2sec-1. The corrosion current was decreased from 8.4 10-7 Acm-2 to 4.6 10-8 Acm-2. The thermal expansion coefficient was increased from 16.69 μm/moC to 41.24 μ m/moC. The linear shrinkage was increased from 0.07 % to 0.18 %. The thermal conductivity was increased from 13.94 W/m-K to 18.06 W/m-K. The composite bipolar plate meets UL-94V0 and LOI>50. The I-V and I-P curves of single cell reach to 0.65 A/cm2 and 0.16 W/cm2, respectively.
參考文獻
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