| Summary: | 博士 === 國防大學理工學院 === 國防科學研究所 === 100 === These bipolar plates that are made from 5052 aluminum, coated with various
coating layers to enhance the corrosion resistance and conductivity. The single cell
test is executed by the performance and long-term experiment. The effect of the
metallic bipolar plate degradation behavior for the PEMFC (Proton Exchange
Membrane Fuel Cell) is analyzed in this experiment.
These bipolar plates with gold coating layer possessed the corrosion-resistance
and good conductivity. The decay rate of bipolar plate under the constant current test
is less than 10％ for 300 hours operation. Even the local corrosion and oxide film led
to the decay of the PEMFC which can be inferred from above result and the AC
impedance analysis. The equivalent circuit parameters show the minor change form
the experiment result.
Furthermore, the aluminum blank can not shield the substrate effectively. The
decay rate for the constant current test is higher than 10％ for 60 hours operation.
The resistance in high frequency varied from 19 mΩto 36 mΩ. It is obvious that the
surface modification is important to the metallic bipolar plate.
The coating layer with (Polytetrafluoroethylene, PTFE) particle enhances the
hydrophobic ability with minor change in the roughness. This microstructure
decreases the corrosive rate on the bipolar plate. Finally, these above results not only
establish the product water analysis for PEMFC, but also contribute to evaluate the
key factors for improving cell performance and provide data for the cell preliminary
design.
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