Gas diffusion layers are one of the important parts of the PEM fuel cell as they serve to transport to transport the reactant gases to the catalyst layer. Porosity of this layer has a large effect on the PEM fuel cell performance. The spatial variation in porosity arises due to two effects: 1. Compression of the electrode on the solid landing areas and 2. Water produced at the cathode side of gas diffusion layers. Both of these factors change the porosity of gas diffusion layers affects fuel cell performance. To implement this performance analysis, a mathematical model which considers oxygen and hydrogen mass fraction in gas diffusion layer and the electrical current density in the catalyst layer, and the fuel cell potentials is investigated. The porosity variation in the GDL is calculated by considering the applied pressure and the amount of the water generated in the cell. The validity of the model is assessed by comparing the computed results with experimental data. The obtained results show that the decrease in the average porosity causes the reduction in oxygen consumption, so that a lower electrical current density is generated. It is also shown that when the electrical current density is low, the porosity variation in gas diffusion layer has no significant influence on the level of polarization whereas at higher current density the influence is very significant. The porosity variation causes non-uniformity in the mass transport which in turn reduces the current density and a lower fuel cell performance is obtained.
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ASME 2004 2nd International Conference on Fuel Cell Science, Engineering and Technology
June 14–16, 2004
Rochester, New York, USA
Conference Sponsors:
- Nanotechnology Institute
ISBN:
0-7918-4165-0
PROCEEDINGS PAPER
The Effects of Porosity Distribution Variation in GDL on PEM Fuel Cell Performance Available to Purchase
R. Roshandel,
R. Roshandel
Sharif University of Technology, Tehran, Iran
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B. Farhanieh,
B. Farhanieh
Sharif University of Technology, Tehran, Iran
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E. Saievar-Iranizad
E. Saievar-Iranizad
Tarbiat Modares University, Tehran, Iran
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R. Roshandel
Sharif University of Technology, Tehran, Iran
B. Farhanieh
Sharif University of Technology, Tehran, Iran
E. Saievar-Iranizad
Tarbiat Modares University, Tehran, Iran
Paper No:
FUELCELL2004-2525, pp. 587-594; 8 pages
Published Online:
November 17, 2008
Citation
Roshandel, R, Farhanieh, B, & Saievar-Iranizad, E. "The Effects of Porosity Distribution Variation in GDL on PEM Fuel Cell Performance." Proceedings of the ASME 2004 2nd International Conference on Fuel Cell Science, Engineering and Technology. 2nd International Conference on Fuel Cell Science, Engineering and Technology. Rochester, New York, USA. June 14–16, 2004. pp. 587-594. ASME. https://doi.org/10.1115/FUELCELL2004-2525
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