Influence of oxyfluorinated graphite on fluorinated ethylene–propylene composites as bipolar plates

서지정보

ㆍ발행기관 : 한국탄소학회 ㆍ수록지정보 : Carbon letters / 30권 / 3호
ㆍ저자명 : Moon Hee Lee, Ho Young Kim, Jiwook Kim, Joong Tark Han, Young‑Seak Lee, Jong Seok Woo

목차

Abstract
1 Introduction
2 Experimental
2.1 Materials
2.2 Oxyfluorination of graphite surface
2.3 Fabrication of FEPgraphite composites via compression molding
2.4 Characterization
3 Results and discussion
3.1 Preparation of FEPgraphite and FEPf-graphite composites
3.2 Effect of oxyfluorination on thermal stability and chemical bonding
3.3 Electrical and mechanical properties of FEPgraphite and FEPf-graphite composites
3.4 Surface morphology of FEPf-graphite composites
4 Conclusions
Acknowledgements
References

영어 초록

Numerous studies have reported that good adhesion and fluorination of carbon materials in a fluoropolymer matrix enhance their electrical and mechanical properties. However, a composite reinforced with oxyfluorinated graphite has not been reported for improving mechanical properties. This paper discusses the fabrication of conductive fluorinated ethylene–propylene (FEP)/oxyfluorinated graphite (f-graphite) composite bipolar plates (BPs) via compression molding. To investigate the effects of fluorinating graphite, graphite with a large particle size of 500 μm was mixed with FEP powder with a small particle size of 8 μm through ball milling. The FEP/graphite composites exhibited high anisotropic electrical conductivity with the in-plane conductivity much higher than the through-plane conductivity because of the planar orientation of the graphite sheets. Therefore, the mechanical properties of the composites such as flexural strength tended to deteriorate with increasing graphite content. In particular, the FEP/f-graphite composites exhibited excellent flexural strength of 12 MPa, much higher than that of FEP/graphite composites at 9 MPa with a graphite content of 80 wt%. The interfacial interaction between FEP and f-graphite led to improved physical compatibilization, which contributed to enhance the mechanical properties of these composites. Our results are a step toward developing BPs for use in high-temperature fuel cells and heat-sink components.

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