微型直接甲醇燃料电池阳极流场瞬态压降特性研究

o tackle with the CO2 removing from the flow field channel, a serious of anode flow field structures with different dimensions and shapes in Micro Direct Methanol Fuel Cell (μDMFC) were designed in this paper. Some μDMFCs running on aqueous methanol solution with a certain flux in anode and air-breathing mechanism in cathode were designed and fabricated. With the pressure drop measure and two-phase flow observation platform, we studied the relationship with pressure drop and current density, as well as the relationship with flux and channel width. The results show that pressure drop increases with the increase of current density at lower current, but it decreases with the increase of current density when it arrive a peak value. Pressure drop increases with the flux increase in channel inlet, but too high or too low flux will decrease full cell performance; it also reveals that the pressure drop variation rate in non-equipotent serpentine channel with 500μm width is smallest one, and is beneficial for the bubble removing.