| Summary: | 博士 === 國立清華大學 === 動力機械工程學系 === 98 === 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.
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