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Effect of carbon fillers on properties of polymer composite bipolar plates of fuel cells
Authors:Joong Hee Lee  Yun Ki Jang  Peng Li
Affiliation:a Department of Hydrogen and Fuel Cell Engineering, Chonbuk National University, Jeonju, Jeonbuk, 561-756, Republic of Korea
b Department of Polymer & Nano Engineering, Chonbuk Natioanl University, Jeonju, Jeonbuk, 561-756, Republic of Korea
c Regional Innovation Center for Fuel Cell Technology, Woosuk University, Wanju, Jeonbuk, 565-701, Republic of Korea
Abstract:Bipolar plates are major components of fuel cell (FC) stacks and they make up a large portion of the stack volume and cost. In order to reduce their weight and fabrication cost, polymer composite materials with various carbon conducting fillers are tested for use as composite bipolar plates for FCs. The composite materials are prepared by using graphite with a small vol.% of carbon black (CB), multi-walled carbon nanotubes (MWNTs) or carbon fibres (CF) in an epoxy resin. The electrical conductivity and flexural properties of the composites are measured as a function of the carbon conductive filler content. The highest electrical conductivity is observed at a total conducting filler content of 75 vol.%. The addition of a small amount of hybrid conducting filler enhances the electrical conductivity up to certain threshold, viz. 5 vol.% of CB, 2 vol.% of MWNTs, and 7 vol.% of CF. Above these thresholds, the electric conductivity decreases with increasing filler content, due to the lack of sufficient resin to bind the fillers tightly. The hybrid filler system has better properties than the single filler system. The experimental results indicate that there is an optimum composition range with respect to electrical conductivity and mechanical properties.
Keywords:Bipolar plate   Electric conductivity   Carbon filler   Mechanical property   Composite   Fuel cell
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