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#
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Parameters and Test conditions
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Unit
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Fuel Cell with 5-layer MEA (DuPontT386-15B)
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Altek’s Fuel Cell
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Notes
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1
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OCV, (Open circuit voltage)
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Volts
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0.9
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0.9
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2
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FC Voltage @ 50mA/cm2
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Volts
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0.65
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0.7
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3
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FC Voltage @ 100mA/cm2
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Volts
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0.57
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0.62
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4
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FC Voltage @ 150mA/cm2
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Volts
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0.48
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0.58
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5
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FC Voltage @ 200mA/cm2
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Volts
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0.40
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0.48
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Altek’s FC Voltage is increased by 20%.
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Test conditions
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1
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Air supply
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By fan
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Breathing
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2
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Water evacuation management
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Fan is required.
Some residual water remains inside the MEA structure after standard cell was disassembled.
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No fan required
Natural evacuation from absolutely hydrophobic gas diffusion cathode surface.
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Altek’s PEMFC is simple: no fan, no control system for it.
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3
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Hydrogen pressure
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psi
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5
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3
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Altek’s Hydrogen regulation system is improved (weight is decreased) by about 10%
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4
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Hydrogen humidification
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Dry
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Dry
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5
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Hydrogen purge
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Periodically
Very sensitive to the hydrogen pressure regulation. Periodic purge is required.
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None
Purge is not required. Once hydrogen parameters are set up there are no problems with fuel cell performance.
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Altek’s hydrogen energy utilization is increased by 20%.
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6
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Hydrogen stoichiometry
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1.2
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1.0
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7
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Observations
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Bipolar plates and MEA’s components are very sensitive to the pressure between endplates.
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Bipolar plates and MEA’s components are not subject to the pressure between endplates, because the current collectors are embedded into a GDE structure
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Altek’s PEMFC design performance is improved by weight and volume decreased as a function of MEA design changed to 3 layers without required end plates with high pressure and bipolar plates
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Difficult to save in storage for repeated test.*
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No problem to store for repeated test, the MEA is reinforced by Ni mesh embedded into GDEs structure and baked together with PEM
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This advantage allows us to get more durable PEMFC with increased lifetime and shelf life.
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