Papers by Keyword: Proton Exchange Membrane (PEM)

Abstract: The electrochemical hydrogen compressor (EHC) is used as a moisture elimination tool for the wet hydrogen gas. As the pressure of cathode compartment increases, the moisture contents of hydrogen decrease, however, the electrochemical performance of the compression cell is deteriorated. In the high enough pressure difference conditions between anode and cathode the electrochemical performance loss results mainly from the dehydration of the proton exchange membrane. In this article the MEA (membrane electrodes assembly) is modified to keep the water molecules not only in the membrane but also in the cathode catalytic layer. Then the electrochemical performance of the hydrogen compression cell is measured with the moisture elimination ability. The variously modified MEAs are tested and the surfaces of modified electrodes are pictured by scanning electron microscope.

Abstract: This paper proposed a combined particle swarm optimization-wavelet-transform based power management for PEM fuel cell powered hybrid electric vehicles which including a PEM fuel cell, a lithium-ion battery and an ultra-capacitor. This combined particle swarm optimization-wavelet-transform based frequency decoupling power management strategy is capable of identifying the high frequency of the ultra-capacitor, the PEM fuel cell low frequency and the lithium-ion battery medium frequency power demand of the hybrid systems. The hybrid system efficiency and life cycle can be extended. We made simulation by using the SimpowerSystem of MATLAB, the results shows the combined particle swarm optimization-wavelet transform based strategy for power management is validated.