被动直接甲醇燃料电池阳极两相传质数值模拟

Numerical Modelling of Two-Phase Mass Transfer in a Passive Direct Methanol Fuel Cell Anode

被动式直接甲醇燃料电池没有泵驱动燃料供给,甲醇溶液单纯利用重力、毛细作用和自然对流等方法传至膜电极发生电化学反应.在被动式直接甲醇燃料电池中,较慢的氧气扩散速率和甲醇扩散速率导致电池性能的降低.本文建立了一个三维、两相、瞬态的被动式直接甲醇燃料电池阳极模型,研究分析了甲醇溶液以及二氧化碳气体在电池阳极的传质情况,计算结果表明,在被动式直接甲醇燃料电池阳极,二氧化碳气体的排出受集流板结构的影响最大。

Without pump to supply fuel, methanol solution is delivered by gravity, capillarity and natural convection to membrane electrode assembly where proceeding electrochemical reaction in passive direct methanol fuel cell （DMFC）. Slow methanol diffusion rate and oxygen diffusion rate may cause fuel cell performance degradation. In this paper, a three-dimensional, two-phase, transient anode model of passive DMFC is developed. Mass transfer condition of methanol solution and carbon dioxide gas in the anode is analyzed. The results indicate removal of CO2 in the DMFC anode is significant affected by collector plate structure.