Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Electrical Resistivity of Natural Graphite/Polymer Composite based Bipolar Plates for Phosphoric Acid Fuel Cells by Addition of Carbon Black

카본블랙 첨가량에 따른 인산형 연료전지(PAFC) 분리판용 천연흑연-고분자복합재료의 전기비저항

  • Kim, Hyo-Chang (School of Materials Science and Engineering, Kumoh National Institute of Technology) ;
  • Lee, Sang-Min (Advanced Material Research Center, Kumoh National Institute of Technology) ;
  • Nam, Gibeop (Advanced Material Research Center, Kumoh National Institute of Technology) ;
  • Roh, Jae-Seung (School of Materials Science and Engineering, Kumoh National Institute of Technology)
  • 김효창 (금오공과대학교 신소재공학과) ;
  • 이상민 (금오공과대학교 신소재연구소) ;
  • 남기법 (금오공과대학교 신소재연구소) ;
  • 노재승 (금오공과대학교 신소재공학과)
  • Received : 2020.08.24
  • Accepted : 2020.09.02
  • Published : 2020.10.27
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Abstract

Conductive polymer composites with high electrical and mechanical properties are in demand for bipolar plates of phosphoric acid fuel cells (PAFC). In this study, composites based on natural graphite/fluorinated ethylene propylene (FEP) and different ratios of carbon black are mixed and hot formed into bars. The overall content of natural graphite is replaced by carbon black (0.2 wt% to 3.0 wt%). It is found that the addition of carbon black reduces electrical resistivity and density. The density of composite materials added with carbon black 3.0 wt% is 2.168 g/㎤, which is 0.017 g/㎤ less than that of non-additive composites. In-plane electrical resistivity is 7.68 μΩm and through-plane electrical resistivity is 27.66 μΩm. Compared with non-additive composites, in-plane electrical resistivity decreases by 95.7 % and through-plane decreases by 95.9 %. Also, the bending strength is about 30 % improved when carbon black is added at 2.0 wt% compared to non-additive cases. The decrease of electrical resistivity of composites is estimated to stem from the carbon black, which is a conductive material located between melted FEP and acts a path for electrons; the increasing mechanical properties are estimated to result from carbon black filling up pores in the composites.

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References

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