Expanded graphite-epoxy-flexible silica composite bipolar plates for PEM fuel cells

B. Dursun, F. Yaren, B. Unveroglu, S. Yazici, F. Dundar*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

Silica impregnated expanded graphite-epoxy composites are developed as bipolar plates for proton exchange membrane (PEM) fuel cells. These composite plates were prepared by solution impregnation, followed by compression molding and curing. Mechanical properties, electrical conductivities, corrosion resistance, and contact angles were determined as a function of impregnated content. The plates show high flexural strength with 5% methyltrimethoxysilane (MTMS) addition (20MPa) and in-plane conductivity of 131 S cm-1 that meet the DOE target (>100 S cm-1). Corrosion current values as low as 1.09 μAcm-2 were obtained. The contact angle was found to be 80°. Power density of 1Wcm-2 was achieved with custom made expanded graphite-polymer composite plates. High efficiency values were obtained at low current regions.

Original languageEnglish
Pages (from-to)862-867
Number of pages6
JournalFuel Cells
Volume14
Issue number6
DOIs
Publication statusPublished - 1 Dec 2014
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Keywords

  • Bipolar plate
  • Composite
  • Expanded graphite
  • PEMFC
  • Silica

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