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首页> 外文期刊>Journal of power sources >Numerical Investigations Of Effect Of Membrane Electrode Assembly Structure On Water Crossover In A Liquid-feed Direct Methanol Fuel Cell
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Numerical Investigations Of Effect Of Membrane Electrode Assembly Structure On Water Crossover In A Liquid-feed Direct Methanol Fuel Cell

机译：液膜直接甲醇燃料电池中膜电极组件结构对水交叉影响的数值研究

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A two-phase mass-transport model is employed to investigate the water transport behaviour through the membrane electrode assembly (MEA) of a liquid-feed direct methanol fuel cell (DMFC). Emphasis is placed on examining the effects of each constituent component design of the MEA, including catalyst layers, microporous layers and membranes, on each of the three water crossover mechanisms: electro-osmotic drag, diffusion, and convection. The results show that lowering the diffusion flux of water or enhancing the convection flux of water (termed as the back-flow flux) through the membrane are both feasible to suppress water crossover in DMFCs. It is found that the reduction in the diffusion flux of water can be mainly achieved through optimum design of the anode porous layers, as the effect of the cathode porous region on water crossover by diffusion is relatively smaller. On the other hand, the design of the cathode porous layers plays a more important role in increasing the back-flow flux of water from the cathode to anode.
机译：采用两相质量传输模型研究液体进料直接甲醇燃料电池（DMFC）通过膜电极组件（MEA）的水传输行为。重点放在检查MEA的每个组成组件设计（包括催化剂层，微孔层和膜）对三种水交叉机理（电渗阻力，扩散和对流）的影响上。结果表明，降低水的扩散通量或提高通过膜的水的对流通量（称为回流通量）均可以抑制DMFC中的水交叉。已经发现，水的扩散通量的降低主要可以通过阳极多孔层的最佳设计来实现，因为阴极多孔区域对通过扩散的水交叉的影响相对较小。另一方面，阴极多孔层的设计在增加水从阴极到阳极的回流中起着更重要的作用。

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