Hygrothermal effects on properties of highly conductive epoxy/graphite composites for applications as bipolar plates

Du, Ling; Jana, Sadhan C.

doi:10.1016/j.jpowsour.2008.03.071

Cited by 29 publications

(13 citation statements)

References 62 publications

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“…The amount of absorbed water for the composite bipolar plates was too small ( < 5%). The water uptake by the NG/NE-PF composites is only 1.8 g water per 100 g of composite, which is consistent with the results obtained by Du and Jana [15] , while the water uptake by the EG/PF composites reached 4.5 g per 100 g composite. It can be considered that the difference in water absorption results from the greater porosity of the EG than that of NG.…”

Section: Water Absorption Propertysupporting

confidence: 91%

Preparation and characterization of graphite/resin composite bipolar plates for polymer electrolyte membrane fuel cells

Chen

Xia

et al. 2014

Science and Engineering of Composite Materials

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Preparing conductive composite bipolar plates for fuel cells by compression molding is a promising research direction. The very key point is how to choose the conductivity filler and binder to meet the requirement. In this article, natural graphite and expanded graphite were used as the filler, and phenolic resin and epoxy resin were used as the binder. The composite bipolar plates were prepared by solution intercalation mixing, compression molding, and curing. The variations in electrical conductivity and mechanical properties were evaluated with the resin content. The results show that the types of fillers and binders have significant effects on the performance of composite bipolar plates, and that the thermal stability of all composite bipolar plates is very good at the fuel-cell working temperature. The corrosion current densities were < 16 μ A/cm 2 , which indicates that the composites developed in this work meet many attributes of bipolar plates for use in polymer electrolyte membrane fuel cells.

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Section: Water Absorption Propertysupporting

confidence: 91%

Preparation and characterization of graphite/resin composite bipolar plates for polymer electrolyte membrane fuel cells

Chen

Xia

et al. 2014

Science and Engineering of Composite Materials

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“…After that, the water uptake of the composites dropped as graphite content was further increased. The minimum value of the water uptake of the composite was found to be 0.40 % at 40 % graphite; this was attributed to the hydrophobic nature of graphite (Du et al 2008) and the reduction in the number of voids. The very low viscosity of the composites allowed the HDPE to fill voids more easily.…”

Section: Viscositymentioning

confidence: 89%

The Effect of Graphite on the Water Uptake, Mechanical Properties, Morphology, and EMI Shielding Effectiveness of HDPE/Bamboo flour composites

Song¹,

Yang²,

Fu³

et al. 2014

BioResources

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This goal of this work was to study the effect of graphite on the water uptake, mechanical properties, morphology, and electromagnetic interference shielding effectiveness (EMI SE) of HDPE/Bamboo flour composites using the material mechanical testing machine, scanning electron microscopy (SEM), and EMI shielding apparatus. The water uptake of the composites was improved by graphite. Compared with the neat HDPE/bamboo composites, the flexural strength of the graphitefilled composites showed a small decrease, but the flexural modulus was enhanced greatly, indicating that graphite could effectively elevate the stiffness of the composites. An obvious result was that the toughness of composites was improved considerably by the graphite. The notched impact strength of the composites was increased from 5.18 to 9.0 KJ/m 2 as graphite content was increased from 0 to 40 %. A large amount of graphite would increase the conductivity property and the EMI SE. The HDPE/bamboo composite with 40% of graphite exhibited electrical resistivity of 31.2 .cm and the EMI SE of 20 dB in the frequency range of 30 -3000 MHz.

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“…PEM fuel cells are operated at temperatures higher than 80 • C and under high humidity [28]. Since the properties of composite bipolar plates could be affected by the operating environment, the effect of the environment on properties must also be understood.…”

Section: Introductionmentioning

confidence: 99%

Effect of Moisture and Temperature on Mechanical Properties of Graphite Composite Bipolar Plate for Proton Exchange Membrane Fuel Cell (PEMFC)

Kim

Heesup

et al. 2011

Advanced Composite Materials

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The fuel cell is considered to be a promising alternative energy source for the near future. A bipolar plate, which is the major component of the fuel cell, is always exposed to the moisture during operation, because one of the important functions of the bipolar plate is to facilitate water management within the cell. In order to use graphite composite materials as bipolar plate material for PEMFC, the effect of the moisture environment on the mechanical properties of bipolar plate is studied. Two types of specimens, one made of particulate graphite 90%-epoxy 10% composite 'with' woven carbon fabric, and the other 'without' carbon fabric, were fabricated. Both types of specimens were kept in three different environmental conditions: (1) dry at room temperature, (2) immersed in 85 • C water for 100 h, and (3) immersed in 85 • C water for 300 h. A series of experiments were performed with the samples of the two types: water absorption rate, strength and modulus from the bending and tensile tests were measured. The results showed that a steep increase of water absorption rate occurred at the beginning of the test followed by a slow increase afterwards. Total water absorption rate was lower for the specimens with fabric since the inserted carbon fabric has lower porosity and lower water absorption than the specimens without fabric made of graphite/epoxy composite. Bending strength and modulus decreased for both types of specimens. However, addition of carbon fabrics to the graphite-particle/epoxy composite increased the tensile strength significantly.

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Hygrothermal effects on properties of highly conductive epoxy/graphite composites for applications as bipolar plates

Cited by 29 publications

References 62 publications

Preparation and characterization of graphite/resin composite bipolar plates for polymer electrolyte membrane fuel cells

Preparation and characterization of graphite/resin composite bipolar plates for polymer electrolyte membrane fuel cells

The Effect of Graphite on the Water Uptake, Mechanical Properties, Morphology, and EMI Shielding Effectiveness of HDPE/Bamboo flour composites

Effect of Moisture and Temperature on Mechanical Properties of Graphite Composite Bipolar Plate for Proton Exchange Membrane Fuel Cell (PEMFC)

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