preparation of electrical conductive abs composite for bipolar plates in pem fuel cell
DESCRIPTION
Preparation of Electrical Conductive ABS Composite for Bipolar Plates in PEM Fuel Cell. Dr. Jatrawan Phumchusak And Miss. Somruthai Tunma. Aim to prepare the electrical conductive polymer composite bipolar plate in order to reduce the manufacturing cost of PEMFC. - PowerPoint PPT PresentationTRANSCRIPT
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Preparation of Electrical Conductive
ABS Composite for Bipolar Plates
in PEM Fuel Cell
Dr. Jatrawan Phumchusak
And
Miss. Somruthai Tunma
2
Aim to prepare the electrical
conductive polymer composite bipolar plate
in order to reduce the manufacturing cost
of PEMFC
3
Introduction :
Polymer Electrolyte Membrane Fuel Cell ; PEMFC
clean and potential energy sorce
high production cost
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Mass distribution in a 33 kW PEMFC stacks :
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Bipolar Plate :
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Classification of materials for BPs used in PEM fuel cell :
Non-metal : Non-porous graphite plates
Metals : Metal plates
Composites : - Metal based - Carbon based :
- Thermoplastics
- Thermosets
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Requirements for Bipolar Plates :
Electrical conductivity :
- DOE (the U.S.Department of Energy) > 100 S/cm
- F.N.Büchi ≥ 10 S/cm(Development of a Bipolar Element for PE- fuel cell, demonstration in a 6 kW stack)
- B.W.Choi ≥ 2.5 S/cm (higher than gas diffusion electrode)(J.Hydrogen energy 21 (1996))
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The BPs have the following functio ns to
perform :
- To distribute the fuel and oxidant within the cell.
- To facilitate water management within the cell.
- To separate individual cells in the stack.
- To carry current away from the cell.
- To facilitate heat management.
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Properties of BP :
Electrical conductivity : plate resistance 0.01 cm 2
Thermal conductivity : as high as possible
Hydrogen/gas permeability : 10-4 cm3/scm2
Corrosion resistance : corrosion rate 0.016 mA/cm2
Compressive strength : 22 lb/in2
Density : 5 gm/cm2
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Bipolar plate :
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Bipolar plate :
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Methodology :
2-rolls mixer
Hot pressing machine
ABS matrix
Graphite powder
Carbon black powder
Carbon fiber
Measure the in-plane electrical resistance by using the digital multimeter
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Result:
ABS–Graphite
Composites
Conductivity, S/cm
60 : 40 8.40 10-3
50 : 50 5.00 10-2
40 : 60 2.10 10-1
30 : 70 2.11
Table 1,2 : Electrical properties of ABS - Graphite composites.
Note : pure graphite
ABS–Graphite
Composites
Conductivity, S/cm
60 : 40 1.77 10-2
50 : 50 3.73 10-3
40 : 60 2.30 10-1
30 : 70 3.67
25 : 75 7.72
20 : 80 13.00
Note : mixed graphite
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Result :
ABS : CB : G
Conductivity, S/cm
25 : 5 : 70
8.16
25 : 10 : 65
9.28
30 : 20 : 50
12.95
Table 3 : Electrical properties of carbonaceous fillers - ABS composites.
Note : CB – Carbon black , G - Graphite
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Table 4 :
ABS: CF : G Composites
Conductivity,
S/cm
ABS : CF1 : G
40 : 20 : 40
0.10
ABS : CF2 : G
40 : 20 : 40
0.30
- CF1 length = 3 mm- CF2 length = 5 mm
-The effect of CF length :longer CF higher conductivity
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Discussion and Conclusion :
- Add carbon fiber to improve the conductivity of ABS composites.
- The effect of content and composition of fillers and the incorporation of fillers including the length of carbon fiber on the electrical properties of polymer composite were studied.
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References:
(1) A. Hermann, T. Chaudhuri and P. Spagnol (2005), “Bipolar plates for PEM fuel cells : A review”, International Journal of Hydrogen Energy, 30, 1297-1302.
(2) H-C. Kuan, C-C. M. Ma, K. H. Chen and S-M. Chen (2004), “Preparation, electrical, mechanical and thermal properties of composite bipolar plate for a fuel cell”, Journal of Power Sources, 134, 7-14.
(3) W. Thongruang, R. J. Spontak and C. M. Balik (2002), “Bridged double percolation in conductive polymer composites: an electrical conductivity, morphology and mechanical property study”, Polymer, 43, 3717-3725.
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Acknowledgement :
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