Study of Nozzle/Diffuser elements applied in Piezoelectric Proton Exchange Membrane Fuel Cells(PZT-PEMFCs)
Date Issued
2010
Date
2010
Author(s)
Chang, Ya-Ting
Abstract
Previous studies of piezoelectric proton exchange membrane fuel cell with nozzle and diffuser (PZT-PEMFC-ND) have shown that a PZT device could solve flooding problems and improve cell performance. In this study, we discuss the performance of PZT-PEMFC-ND with different nozzle and diffuser geometry design. And a PZT-PEMFC-ND bi-cell with pseudo bipolar electrodes was developed to achieve a higher power output. This new design, with a reaction area of 4cm2, contains two cells with two outside anodes and two inside cathodes that share a common PZT vibrating device for pumping air flow. The experiment results show that a proper open angle of 10° and a proper aspect ratio(AR) of 5.63 could have a better cell performance. A larger open angle value will cause longer time of separation in one period. A larger AR of 11.25 and 16.88 induced a blocking phenomenon inside the diffuser element, and thus less air was sucked into the cathode chamber. This study also concludes that the innovative design of the PZT-PEMFC-ND bi-cell could reach the best performance of 0.27W/cm2 at the condition of AR5.63 and θ=10°. And the bi-cell can have a net power output of 0.84W at 60Hz.
Subjects
PEMFC
Piezoelectric device
bi-cell
Current density
Aspect ratio
open angle
Type
thesis
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