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http://dx.doi.org/10.3740/MRSK.2020.30.10.522

Electrical Resistivity of Natural Graphite/Polymer Composite based Bipolar Plates for Phosphoric Acid Fuel Cells by Addition of Carbon Black  

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)
Publication Information
Korean Journal of Materials Research / v.30, no.10, 2020 , pp. 522-532 More about this Journal
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.
Keywords
phosphoric acid fuel cell (PAFC); bipolar plates; carbon black; resistivity; composite;
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Times Cited By KSCI : 7  (Citation Analysis)
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