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Model approaches for the description of lateral
effects in PE fuel cells Stefan Freunberger,
Felix Büchi Electrochemistry Laboratory Paul
Scherrer Institut, Villigen
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Why modeling?

• On microscopic level
• understand actual material and basic mechanisms
  and phenomena
• improve the material

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The object
Péclet - number
x 100 mm / 0.66 mm
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Counter-flow Analysis of Isothermal Case
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Co-flow Analysis of Isothermal Case
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Validation of Isothermal Model with technical cell
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Experimental Analysis Semi-Segmented Cell
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Both gases wet, Tcell 70 C
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Dry air, Tcell 70 C
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Conclusions up to now
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Through-plane heat transfer
j 0.5 A/cm2
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Cooling
Cooling in
Cooling out
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Coolant Flow Field
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Co flow
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Final Conclusions

• What did we learn?
• there is no isothermal cell
• never ever
• take advantage of this
• already reduced models give
• useful insight

• What is to do
• Non isothermal full cell model
• use professional numeric software
• experiments experiments
• experiments

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Acknowledgement

• Collaboration and Discussions with ZHW
• for financial
  support

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