Journal
JOURNAL OF POWER SOURCES
Volume 195, Issue 17, Pages 5474-5480Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2010.03.083
Keywords
Fuel cell; Bipolar plate; Hybrid carbon; Electrical conductivity; Mechanical property
Funding
- Ministry of Knowledge Economy (MKE)
- Ministry of Education, Science and Technology [S1 08A01003210]
- National Research Foundation of Korea [핵06A1303, 2008-2003208] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A hybrid carbon system of graphite powder (GP) and continuous carbon fibre fabric (CFF) is used for an epoxy composite to improve the electrical conductivity, mechanical properties and mouldability of a composite bipolar plate. These improvements are achieved simultaneously by inserting several layers of CFF into the GP/epoxy composite to enhance the mechanical properties and in-plane conductivity. The electrical properties, flexural strength and mouldability of the composite plates are measured as a function of conducting filler content and number of CFF layers. The composites show improved electrical conductivity, flexural properties and mouldability. Composites with 70-75 vol.% carbon fillers have the highest electrical conductivity with reasonable flexural properties. These results suggest that the poor mouldability and low through-plane electrical conductivity of the continuous fibre composite bipolar plate, as well as the weak flexural properties of GP composites, can be overcome by incorporating a GP/CFF hybrid system. (C) 2010 Elsevier B.V. All rights reserved.
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