燃料電池用導電雙極板之奈米複合材料備製及其協成性質研究

Study on the Preparation and Synergy Effect of Nano-Composites for Fuel Cell Bipolar Plate

陳韋任(Wei-Jen Chen)

指導教授 ： 葉銘泉

國立清華大學/工學院/動力機械工程學系/博士(2010年)

摘要

本研究主要使用酚醛樹脂與和石墨粉末、碳纖維與奈米填充材料製備奈米複合材料導電雙極板，有兩種製備方式如下；1.固定石墨粉末含量在80 wt %、碳纖維含量在2 wt %，奈米填充材包括；改質與未改質碳奈米管、奈米氧化铟錫粉末(Nano-Indium Tin Oxide)，並改變添加比例(0, 0.1, 0.25, 0.5, 1 wt %)。以塊狀模造成型（Bulk Molding Compound , BMC）製備燃料電池用奈米複合材料導電雙極板。2. 以預浸材(prepreg)熱壓成型製備燃料電池用導電雙極板之奈米複合材料。先製備含奈米填充材之高分子樹脂，奈米填充材包括；改質與未改質碳奈米管、碳氣凝膠(Carbon aerogel)，並改變添加比例(0, 0.1, 0.25, 0.5, 1 wt %)。再利用超音波含浸於碳纖維蓆(布)，製備成奈米預浸材，疊層後利用熱壓成型法製備燃料電池用奈米複合材料導電雙極板。分別量測雙極板具指標性的性質；機械強度、導電度、熱傳導率、熱膨脹率等，再經過環境影響因素(25℃/85RH/168hr and 85℃/85RH/168hr )量測其對機械性質的影響。
研究結果顯示；室溫下添加奈米材料對機械性質、電性質、熱性質等均有提升的效果。經過環境影響因素下，適當添加奈米材料有助於上述性質抵抗環境影響。

關鍵字

燃料電池 ； 雙極板 ； 碳奈米管 ； 奈米氧化金屬 ； 碳氣凝膠

並列摘要

Adopting phenolic resin, graphite powder, carbon fiber and nano filler to fabricate bipolar plates is the aim of this study.
Two methods were employed in this study to fabricate bipolar plate as follows: (a) a fixed amount of graphite powder at 80 wt%, a fixed amount of carbon fiber at 2 wt%, and various proportions (0, 0.1, 0.25, 0.5, 1 wt%) of modified and unmodified carbon nanotubes and nano-indium tin oxide powder were used as nano filler, and Bulk Molding Compound, BMC was employed to fabricate nanocomposite bipolar plate for fuel cell. (b) hot pressing was the second method to fabricate the nanocomposite of bipolar plate for fuel cell.
The polymeric resin of nanofiller was prepared first. Both modified and unmodified carbon nanotube and carbon aerogel were adopted as nanofillers with the various additive proportions (0, 0.1, 0.25, 0.5, 1 wt%). The nano filler was evenly immersed into carbon fiber using sonication method to prepare the nano prepreg, and then the prepregs were stacked into layers and placed into the mold to fabricate nanocomposite conductive bipolar plates by using hot pressing.
The measurement of the essential properties including mechanical strength, electrical conductivity, thermal conductivity, thermal expansion, etc. must be done, and the effect of the circumstance variation (25℃/85RH/168hr and 85℃/85RH/168hr) on mechanical strength also be measured and analyzed. The test results indicate that mechanical, electrical and thermal properties increase with adding nano filler under room temperature.
Furthermore, after suffering from the effect of the circumstance variation, adding proper amount of nano filler into composites is effective in resistance to effect of circumstance for above-mentioned properties.

並列關鍵字

Fuel Cell ； bipolar plates ； Carbon nanotube ； Nano-metal oxide ； Carbon aerogel

參考文獻

178. M. A. Kiselev and A. I. Kuzayev, ”Preparation and properties of silicone Modified Phenol-Formaldehyde Resin,” U.S. Patent 2685054 (1968)

6. Charles Dickens , A Tale of Two Cities, Chapman and Hall, United Kingdom, 1859.

12. Li Xianguo., Imran Sabir, “Review of bipolar plates in PEM fuel cells, Flow-field designs,” International Journal of Hydrogen Energy 30, 359-371. (2005)

14. P. Costamagna, S. Srinivasan, “Quantum Jumps in the PEMFC science and technology from 1960s to the year 2000,” Part I. Fundamental scientific aspects, 102, 242-252 (2001)

15. J. Wu, X. Z. Yuan, J.J. Martin H. Wang, J. Zhang, J. Shen, S. Wu and W. merida, “A Review of PEM fuel cells durability : Degradation mechanisms and mitigation strategies,” Journal of Power Sources, 184, 104-119 (2008)