Home > Publications database > Inhomogeneous distribution of polytetraflourethylene in gas diffusion layers of polymer electrolyte fuel cells > print

001     889819
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024 7 _ |a 10.1007/s11242-021-01542-0
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100 1 _ |a Froning, Dieter
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245 _ _ |a Inhomogeneous distribution of polytetraflourethylene in gas diffusion layers of polymer electrolyte fuel cells
260 _ _ |a Dordrecht [u.a.]
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520 _ _ |a Polymer electrolyte fuel cells require gas diffusion layers that can efficiently distribute the feeding gases from the channel structure to the catalyst layer on both sides of the membrane. On the cathode side, these layers must also allow the transport of liquid product water in a counter flow direction from the catalyst layer to the air channels where it can be blown away by the air flow. In this study, two-phase transport in the fibrous structures of a gas diffusion layer was simulated using the lattice Boltzmann method. Liquid water transport is affected by the hydrophilic treatment of the fibers. Following the assumption that polytetrafluorethylene is preferably concentrated at the crossings of fibers, the impact of its spatial distribution is analyzed. Both homogeneous and inhomogeneous distribution is investigated. The concentration of polytetrafluorethylene in the upstream region is of advantage for the fast transport of liquid water through the gas diffusion layer. Special attention is given to the topmost fiber layer. Moreover, polytetrafluorethylene covering the fibers leads to large contact angles.
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700 1 _ |a Lehnert, Werner
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773 _ _ |a 10.1007/s11242-021-01542-0
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856 4 _ |u https://juser.fz-juelich.de/record/889819/files/Froning2021_Article_InhomogeneousDistributionOfPol.pdf
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