Study on the Composites of Phenol Formaldehyde Resin/Graphite Reinforced by Milled Carbon Fibers for Bipolar Plates

Abstract:

Composites of phenol formaldehyde (PF) resin/graphite reinforced by milled carbon fibers (MCFs) for bipolar plates are obtained by hot compression molding. The raw materials of the MCF particles, PF resin powder and graphite powder are simply dry powder ball milled and mixed. The effects of PF resin content and the content, granularity and surface treatment methods, such as air oxidation and Fenton/ultraviolet (UV) liquid-phase oxidation of MCFs on the electrical conductivity and flexural strength of the composites are measured by methods of four-point probe technique and three point flexural test, and the fracture patterns of the composites are analyzed by scanning electron microscope (SEM). The results indicate that the electrical conductivity decreases and flexural strength increases with the increase of PF resin content. Especially, the values of electrical conductivity and flexural strength can reach 165.28 S.cm-1 and 55.11MPa respectively when the PF resin content was 17% in weight. The properties of composites reinforced by air oxidation treated MCFs are better than those by liquid-phase oxidation treated one. The electrical conductivity and flexural strength of the composites are 208.12S.cm-1 and 57.44 MPa when they reinforced by 5% MCFs which treated by air oxidation at 450 . Compared with the nonreinfoced composites, the properties of reinforced composites increase 25.92% in electrical conductivity and 4.23% in flexural strength.

• Periodical: Advanced Materials Research (Volumes 156-157)
• Pages: 1090-1096
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.156-157.1090
• Online since: October 2010
• Authors: Wei Qiang Wang, Ai Ju Li, Ming Ming You, Bin Xia
• Keywords: Composite, Fuel Cell (FC), Graphite, Milled Carbon Fibers, Phenol Formaldehyde Resin

References

[1] I. Bar-On, R. Kirchain and R. Roth. Technical cost of analysis for PEM fuel cell. J. Power Sources, Vol. 109 (2002), pp.71-75.

DOI: 10.1016/s0378-7753(02)00062-9

[2] B. Zhu, B. C. Mei and C. H. Shen. Progress in the research of composite bipolar plates of PEMFC. Battery Bimonthly, Vol. 37 (2007), pp.387-389. (in Chinese).

[3] L. G. Xia, A. J. Li, W. Q. Wang, Q. Yin, H. Lin and Y. B. Zhao. Effects of resin content and preparing conditions on the properties of polyphenylene sulfide resin/graphite composite for bipolar plate. J. Power Sources, Vol. 178 (2008), pp.363-367.

DOI: 10.1016/j.jpowsour.2007.11.094

[4] Q. Yin, A. J. Li, W. Q. Wang, L. G. Xia and Y. M. Wang. Study on the electrical and mechanical properties of phenol formaldehyde resin/graphite composite for bipolar plate. J. Power Sources, Vol. 165 (2007), pp.717-721.

DOI: 10.1016/j.jpowsour.2006.12.019

[5] S. R. Dhakate, R. B. Mathur, B. K. Kakati and T. L. Dhami. Properties of graphite-composite bipolar plate prepared by compression molding technique for PEM fuel cell. Int. J. Hydrogen Energy, Vol. 32 (2007), pp.4537-4543.

DOI: 10.1016/j.ijhydene.2007.02.017

[6] L. Du, S. C. Jana. Highly conductive epoxy/graphite composites for bipolar plates in proton exchange membrane fuel cells. J. Power Sources, 172 (2007), p.734–741.

DOI: 10.1016/j.jpowsour.2007.05.088

[7] Priyanka H Maheshwari, R. B. Mathur and T. L. Dhami, Fabrication of high strength and a low weight composite bipolar plate for fuel cell applications, J. Power Sources, Vol. 173 (2007), p.394–403.

DOI: 10.1016/j.jpowsour.2007.04.049

[8] Lee H S, Kim H J, Kim S G and S. H. Ahn. Evaluation of graphite composite bipolar plate for PEM (proton exchange membrane) fuel cell: Electrical, mechanical, and molding properties. J. Mater. Process. Technol., Vol. 187–188 (2007), p.425–428.

DOI: 10.1016/j.jmatprotec.2006.11.213

[9] A. J. Li, K. N. Sun, W. Q. Wang, Q. Yin, L. Shao and C. C. Jiang. A fuel cell bipolar plate composite and its preparation process, Chinese Patent ZL200710016748. 0 (2009).

[10] Q. Yin, K. N. Sun, A. J. Li, L. Shao, S. M. Liu and C. Sun. Study of carbon nanotube reinforced phenol formaldehyde resin/graphite composite for bipolar plate, J. Power Sources, Vol. 175 (2008), pp.861-865.

DOI: 10.1016/j.jpowsour.2007.10.013

[11] Q. Yin. Fabrication and properties of carbon nanotubes reinforced phenol formaldehyde resin/graphite composite for bipolar plate. PhD thesis, Shandong University, (2008).

[12] W. Li, R. M. Cheng and X. C. Xu. Effect of Hydroxyl Radical on the Surface and Structure of Multi-walled Carbon Nanotubes. Chinese J. Inorg. Chem., Vol. 21 (2005), p.186－190.

[13] Y. D. Liu, S. C. Xu. Application of Fenton-like Reagents to Industrial Wastewater Treatmeat. Shanghai Environ. Sci., Vol. 13(1994), pp.26-34.

[14] K.T. Fang. Uniform Design and Uniform Design Table. Science Press, Beijing (1994). pp.71-75.

[15] J. G. Clulow, F. E. Zappitelli, C. M. Carlstrom, J. I. L. Zemsky, D. N. Busick and M. S. Wilson. Fuel Cell Technology: Opportunities and Challenges, Topical Conference Proceedings. 2002 AIChE Spring National Meeting, New Orleans, LA(2002).