|dc.description.abstract||The purpose of this study is to use different micro characters of metal foam as the flow field of PEMFC in metal bipolar plates. The experiments are to explorer the performance of PEMFC in various pore size and area density of metal foam at different (temperature, moisture etc.) test conditions.
Metal bipolar plates own good conductivity, high mechanical strength, easy machinery, easy mass production and it has been regarded as the alternative material in bipolar plates. It takes much time to manufacture flow channels in bipolar plates. Therefore, the fillister design with porous metal is used. Besides, take advantage of porous metal that has good performace in conductivity and permeability to supersede traditional flow channels design to achieve the enhancement of fuel cell.
In this study, observed the pore size and area density are significant and firmly believed in metal foam PEM fuel cell.The larger pore size of metal foam could affect the gas permeability. In addition, it also provide reactant gases to have better diffusionsive ability and increase the opportunities to get in touch with the Pt catalyst on electrode. As for the area density, we found it can reduce the internal resistance of fuel cell which may increase the performance. From the experiments,the metal foam needs to be immersed in adequated hydrophobic liquid and baked within a period of time.Then use optimum operational conditions (pressure, moisture temperature, cell temp). The results tell us when voltage at 0.6V, the current density is greater than 2 A/cm2 for per single cell.We wish this experimental results and information could be used for development of porous flow channel PEMFC stacks in future.