Improvement of electrical resistivity of highly filled graphite/PP composite based bipolar plates for fuel cells by addition of carbon black

Krause, Beate; Pötschke, Petra; Hickmann, Thorsten

doi:10.1063/1.5121681

Cited by 15 publications

(18 citation statements)

References 7 publications

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“…However, the values are lower compared to those reported in reference [7] for PP/EPDM-based composites, where slightly higher thermal conductivities of 12.2 W/m·K and 15.5 W/m·K were found for composites with 60 and 80 wt % expanded graphite, respectively. Comparing the thermal conductivity at 20 wt % graphite, the values obtained are higher than those given in references [12,13], where thermal conductivities of 1.0 W/m·K and 1.5 W/m·K respectively were achieved for PP composites.…”

Section: Resultscontrasting

confidence: 74%

“…The electrical conductivity results reported in reference [8] of PP-based composite materials with 78 wt % graphite were in the same conductivity range: values between 5 S/cm and 22 S/cm were measured, depending on the shape or particle size of the graphite and the measurement parameters (contact pressure). The achieved electrical conductivity values of this work are better than those reported in [7], where electrical conductivities of 1.3 S/cm and 5.3 S/cm were achieved for PP/EPDM-based composites with 60 wt % and 80 wt % of the same expanded graphite as in this study. Obviously the EPDM addition improves the processing behavior of the composites, but has a slightly negative effect on the electrical conductivity.…”

Section: Resultscontrasting

confidence: 72%

“…For the electrically and thermally conductive filler, expanded graphite powder Sigratherm ® GFG600 (SGL Carbon, Meitingen, Germany) was used. The particle size was determined as x 10 = 106 µm, x 50 = 269 µm, x 90 = 395 µm and x 99 = 444 µm (mean value of three measurements) [7].…”

Section: Methodsmentioning

confidence: 99%

“…An electrical conductivity of 23.2 S/cm was measured for a PP-based composite with 80 wt % of graphite (solution mixing). In [7] the compounding of PP/EPDM matrix with carbon black and different kinds of graphite led to a significant increase of thermal conductivity and decrease of electrical resistivity of obtained composite materials. Using the same type of expanded graphite as in this paper, a thermal conductivity of 12.2 W/m·K for PP/EPDM + 60 wt % graphite and 15.5 W/m·K for PP/EPDM + 80 wt % of graphite was achieved.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Highly Filled PP/Graphite Composites for Adhesive Joining in Fuel Cell Applications

2019

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In order to evaluate the suitability of graphite composite materials for use as bipolar plates in fuel cells, polypropylene (PP) was melt compounded with expanded graphite as conductive filler to form composites with different filler contents of 10–80 wt %. Electrical resistivity, thermal conductivity, and mechanical properties were measured and evaluated as a function of filler content. The electrical and thermal conductivities increased with filler content. Tensile and flexural strengths decreased with the incorporation of expanded graphite in PP. With higher graphite contents, however, both strength values remained more or less unchanged and were below the values of pure PP. Young’s-modulus and flexural modulus increased almost linearly with increasing filler content. The results of the thermogravimetric analysis confirmed the actual filler content in the composite materials. In order to evaluate the wettability and suitability for adhesive joining of graphite composites, contact angle measurements were conducted and surface tensions of composite surfaces were calculated. The results showed a significant increase in the surface tension of graphite composites with increasing filler content. Furthermore, graphite composites were adhesively joined and the strength of the joints was evaluated in the lap-shear test. Increasing filler content in the substrate material resulted in higher tensile lap-shear strength. Additionally, the influence of surface treatment (plasma and chemical) on surface tension and tensile lap-shear strength was investigated. The surface treatment led to a significant improvement of both properties.

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Section: Resultscontrasting

confidence: 74%

Section: Resultscontrasting

confidence: 72%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization of Highly Filled PP/Graphite Composites for Adhesive Joining in Fuel Cell Applications

2019

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“…Typical compositions are > 80 % conductive filler and < 20 % binder polymer, in some cases for fuel cell applications also carbon black. [5] Compounding, processing and manufacturing is substantially different from conventional polymers due to the high content of filler material in the compound [6]. Therefore, a 3dimensional percolating particle pack structure is required.…”

Section: Processmentioning

confidence: 99%

Bipolar Plates: Different Materials and Processing Methods for Their Usage in Fuel Cells

Hickmann

2020

E3S Web Conf.

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Graphite composites based bipolar plates are a preferred material for stationary PEM fuel cell applications, because they are resistant against high temperatures and corrosive conditions. This chapter gives an overview about different material configurations as well as the most important parameters and characterization methods for graphite based bipolar plates. It describes the actual generation PPS based composite materials with improved long-term stability. It introduces the most common materials and gives an overview about interactions between other stack components, characterization and processing, great care should be taken in constructing the bipolar plates.

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Carbon Xerogel as a Novel Minor Conductive Filler for Carbon‐Polymer Composite Bipolar Plates

Sharma,

Bilican,

Schmidt

et al. 2024

Batteries & Supercaps

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The current research explores the potential of carbon xerogel as a conductive filler in bipolar plates. The composites comprise graphite as the primary conductive filler and polypropylene as the binder. Carbon xerogel is introduced as a minor conductive filler, and its performance is compared with commercial carbon black. Both nanocarbons exhibit resemblances in microstructure, texture, and surface carbon chemistry. Through‐plane conductivity measurements reveal enhanced electrical conductivity upon replacing a fraction of graphite with either nanofiller. Cross‐sectional analyses of the plates employing computed tomography based on X‐ray diffraction and phase contrasts indicate that the observed electrical conductivity difference stems from reduced trapped air during production and the distribution of the minor filler particles. Given the similarities between carbon xerogel and the reference nanofiller, this study introduces the innovative concept of employing carbon xerogel as a filler for conductive bipolar plates.

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Improvement of electrical resistivity of highly filled graphite/PP composite based bipolar plates for fuel cells by addition of carbon black

Cited by 15 publications

References 7 publications

Characterization of Highly Filled PP/Graphite Composites for Adhesive Joining in Fuel Cell Applications

Characterization of Highly Filled PP/Graphite Composites for Adhesive Joining in Fuel Cell Applications

Bipolar Plates: Different Materials and Processing Methods for Their Usage in Fuel Cells

Carbon Xerogel as a Novel Minor Conductive Filler for Carbon‐Polymer Composite Bipolar Plates

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