MEMS微型质子交换膜燃料电池阳极新结构

New Anode Structure of the Micro Proton Exchange Membrane Fuel Cell Based on MEMS Technology

利用微电子机械技术（MEMS）制备了含有4条脊的点蛇混合阳极新结构,组成自呼吸式微型燃料电池,并与老式阳极结构（含2条脊）比较。研究发现,当阳极的集流条由2增加到4时,流道总长度增大约一倍,电池的极限电流密度和峰值功率密度分别提高18.56%和15.26%,在100~500 mA恒电流放电下,可节省燃料平均达6.18%。流场的深度过深和过浅都不利于电池性能的发挥,在175μm深度时电池的效果最佳,氢气的有效利用率最高;氢气的流速对电池的性能影响不大,10~20 mL/min的流量足以保证燃料供给。

A new pin-serpentine mixed anode field plate was fabricated using silicon micro-electromechanical system（MEMS） technology.The new anode with 4 ribs and the old one with 2 ribs were assembled with cathodes to form air-breathing micro proton exchange membmne fuel cells（μPEMFC）.The results showed.when the current collecting rib of anode increased from 2 to 4 the total length of anode flow field was doub led and the limiting current density and the peak power density are increased by 18.56% and 15.26%.This can save fuel by average 6.18% at discharging current of 100~500 mA.The cell performance is markedly changed with the variety of anode flow field depth,and the best performance and the greatest fuel utilization percent appear at the depth of 175 μm.The H2 flow rate has little influence on cell performance,the suitable H2 flow rate for cells is 10~20 mL/min.